2017

SATCOM AND NAVIGATION APPLICATIONS AREA

SPACE APPLICATIONS CENTRE, ISRO

Request for proposal (RFP) for Ku Band Rx

only Earth station

DOC: Ku-BAND RFP/GISAT-1&2 GS/SAC/2017

Request for Proposal (RFP)

Supply, Installation and Commissioning of

Ku Band Rx only Earth station

SPACE APPLICATIONS CENTRE

INDIAN SPACE RESEARCH ORGANIZATION

AHMEDABAD

TABLE OF CONTENTS

A. INTRODUCTION .................................................................................................................... 5

B. SCOPE OF WORK ................................................................................................................... 5

C. RESPONSIBILITIES OF VENDOR ......................................................................................... 6

D. GENERAL GUIDELINES AND OTHER CONDITIONS ......................................................... 8

E. PREPARATION AND SUBMISSION OF BIDS ....................................................................... 9

F. DELIVERY SCHEDULE........................................................................................................ 11

G. TECHNICAL SPECIFICATIONS .......................................................................................... 11

1. System Description .......................................................................................................... 13

a. RF Systems .................................................................................................................. 14

a. Antenna & Feed System ............................................................................................... 14

b. 1:2 low noise amplifier assembly .................................................................................. 14

c. Down Converters ......................................................................................................... 15

d. Fiber-Optic Link interface ............................................................................................ 16

2. Antenna Control Servo System ......................................................................................... 16

a. System description ....................................................................................................... 16

b. System operating modes ............................................................................................... 16

c. System safety interlocks ............................................................................................... 18

d. System status display ................................................................................................... 20

e. System functional requirements .................................................................................... 21

f. Required Features & Functions of ACU ....................................................................... 21

g. Remote antenna console (RAC) .................................................................................... 22

h. ACU M&C windows/LINUX application software: ..................................................... 23

i. RAC M&C windows/LINUX application software: ..................................................... 23

j. Instrumentation software/diagnostic tools ..................................................................... 24

k. Antenna Motor & Drive System ................................................................................... 24

l. Drive Amplifier Specifications ..................................................................................... 25

m. Antenna Drive Unit .................................................................................................. 26

n. ADU Functional Specifications: ................................................................................... 26

o. Mechanical Aspects: .................................................................................................... 27

p. Encoder Box ................................................................................................................ 27

3. Mechanical Systems: ........................................................................................................ 28

a. Description of the Antenna mechanical s ys t e m .......................................................... 28

b. Mechanical considerations for Antenna Design ............................................................ 29

c. Structural analysis, design and fabrication details ......................................................... 29

d. Civil works for Antenna Pedestal ................................................................................. 30

4. Reliability & QA requirements ......................................................................................... 30

5. System Installation & Integration ..................................................................................... 31

G ANNEXURE-1: COMPREHENSIVE ANNUAL MAINTENANCE CONTRACT (CAMC) .......... 34

H. ANNEXURE-2: LIST OF KU-BAND DATA RECEPTION SYSTEM DELIVERABLES ....... 36

A. Introduction

In the coming years Indian Space Research Organization (ISRO) is planning to launch Geo Imaging

Satellites with disaster management as prime objective. The satellites transmit data to ground in Ku-

band (10.70 GHz to 12.75 GHz) with signals in vertical and horizontal polarization. Space

Applications Centre (SAC), Ahmedabad, has the responsibility for setting up of Ku-band ground

stations at (1) SAC, Bopal Campus, Ahmedabad, Gujarat State, India and / or (2) Delhi Earth Station,

New Delhi, India. The Ku-Band Reception system shall have the capability to track and receive data

from satellite. This document provides technical specifications and requirements for Ku-band

Reception system.

B. Scope of work The work includes supply, installation and commissioning of upto two Ku-Band Data Reception

Systems at (1) SAC, Bopal Campus, Ahmedabad, Gujarat and / or (2) Delhi Earth Station, New

Delhi. (Total two earth stations). The Data Reception System (DRS) shall have the capability to track

the GEO satellites of 36500 Km orbit having some inclination. The systems shall be installed and

interfaced with the ground station baseband room systems where the operations of reception system

shall be performed. The supply of baseband system is not part of this RFP. The IF signal transfer

from antenna to Base band system room will be done using fiber optic links. The distance for the

OFC links will be approximately 500m from Antenna to base band system room. SAC intends to

entrust the task of supply and installation of ‘Ku-Band Earth station ’ to an industry on turn-key basis.

The implementation of the project includes system engineering, design/development, supply of the

system (hardware & software) installation & commissioning of Ku-Band Rx only earth station. The

system being offered should be operational elsewhere for at-least one year by the time of supply. The

Supply and installation of ‘Ku-Band Rx only earth station’ will involve (not limited to) the following

minimum activities as under

� Understanding the requirements.

� Supply of Hardware/Software systems.

� Civil works for Antenna base structure.

� Equipment Transportation to site

� Installation, Commissioning and on-site acceptance testing.

� Documentation, User manual and Training

� Capability to support the systems for at least ten years post-Installation.

� Warranty and post-warranty services

� Supply of required interfacing cables of all types, patch panel, patch cords, coaxial connectors,

fiber optic cables, transceivers, fiber optic link spares etc and any other necessary accessories.

� SAC will supply feed system of the above antenna to the vendor.

The project management team of SAC will periodically review the technical, commercial and

managerial aspects of the activity.

The typical reviews will be as under:

� Preliminary Design Review with test plans

� Critical Design Review and any other engineering reviews that seems necessary and essential

� Final On-site Acceptance Tests

C. Responsibilities of Vendor Following table defines vendor’s responsibilities for entire work involving the establishment

& commissioning of data reception system

Vendor is requested to quote for Ku Band Rx only earth station in slabs of one and two

quantities as mentioned in the Enquiry.

Table-1: Vendor’s Responsibility

Sl. No Vendor’s Responsibility

1. To understand requirements and scope of work completely and

unambiguously.

2. Provide system engineering calculations along with the proposed hardware

to meet the requirement, as projected in this RFP.

3. Provide space and electricity requirement for equipments.

4. Submit a comprehensive list of deliverables along with the offer with price

masked for any/all proposed configurations in their technical bid.( Two part

tender)

5. Provide detailed cost break-up as part of the offer in the commercial bid

6. Provide breakup of delivery schedule as part of the offer

7. Prepare the detailed design review (DDR) document and make presentation

during the DDR to the technical committee appointed by SAC. It will be

mandatory for the vendor to close all actions generated during this review.

Closure of actions will be without impact on cost.

Complete Mechanical details (FE Analysis for antenna assembly and

support structure against RF specification, hardware housing details etc)

8. Vendor should carry out detailed soil investigation report of the site through NABL

accredited labs, submit the report to SAC. The design of the foundation should be

carried out to by the vendor as per the soil investigation report. Please note there

is a railway track nearby the Ahmedabad site and rocky soil at New Delhi site

9. Additionally, vendor has to provide combined FE model of foundation and antenna

structure should be used to carry out Pointing and tracking error calculations. FE

models along with detailed structural analysis report (static and dynamic)

containing stress, deformation, natural frequency etc. should be submitted to SAC.

10. Prepare, discuss and submit Acceptance Test Plan (ATP) to SAC. Changes

suggested by SAC should be implemented by the vendor during DDR.

11. Carry out site preparation and antenna pedestal and other construction work.

12. Vendor shall provide the test reports for all sub-systems (eg. Antenna, LNA

system, Downconverters, etc.) and get it approved by SAC before dispatch

13. SAC will supply Ku-band two ports Rx only feed with 2 channel monopulse

tracking capability for the above antenna. The mechanical interface of feed

mounting will be jointly worked out. The vendor has to agree to integrate,

install and test the antenna system with SAC made feed to meet the overall

specifications. All the mechanical drawing (reflector optics etc,) must be

shared with SAC for the realization of the feed for the above antenna.

14. SAC has the technology of 2-Channel Monopulse Tracking Receiver. Vendor

may approach SAC for technology transfer, if required.

15. Transportation of equipment to the respective site.

16. Integration of the Hardware and Software of system.

17. Installation, commissioning and testing of the complete ground system as

per the requirements given in this RFP

18. Vendor shall perform acceptance tests as per approved ATP document

19. Vendor shall also arrange, install all interface equipment needed to connect

with the OFC cable

20. Supply documentation, relevant OEM certificates, performance report of all

subsystems and manuals in hard and soft copies

21. Vendor shall submit comprehensive maintenance plan (as detailed in

annexure-1) for services during warranty period of 3 years.

After completion of warranty period, vendor must commit to undertake

extended comprehensive maintenance services for next 3 years.

Vendor must also commit to undertake extended comprehensive

maintenance services for additional 4 years, after completing maintenance

for 3+3 years, if called for by SAC.

Vendor should also explain their strategy for CAMC.

22. Vendor shall provide along with the offer, an inventory of critical spares,

which the vendor will maintain for maintenance for post installation

services.

23. Select the sub-systems in a manner which ensures the continuity of services

for at least 10 years (preferably 15 years)

D. General Guidelines and Other Conditions 1. Vendor shall comply to all the specifications and requirements in RFP, deviations if any

shall be mentioned in a separate table and provide justification how these deviations will

/will not hamper the overall performance of the system. Any improvement shall be

separately brought out in the offer.

2. Vendor shall propose and quote for the most suited configuration and sub-systems

against the given set of overall specifications in this RFP. However, limited options with

respect to sub-systems could also be included, clearly bringing out their comparative

merits and demerits.

3. The overall configuration and implementation plan should be clearly explained with the

help of block schematic of the complete system. The offer should also include the

technical justification of choosing each sub-system with respect to the goal of meeting

overall system specifications and other requirements.

4. The vendor must provide a Statement of Compliance (SoC), covering each point of

system and sub-system specifications of complete earth station system as mentioned in

respective sub-system details. SOC by the OEMs and not supported by vendor is not

acceptable. In case of any discrepancy between OEM datasheet and compliance

statement, OEM datasheet will be considered final and binding. This SoC should be well

supported by documentation consisting of data sheets, brochure, calculations, literature

etc. All relevant details of each subsystem like make & model number, detailed

specifications, block schematic, if possible test data sheet etc. should also be provided.

5. After receiving the offers, Vendors will be invited if found necessary to make technical

presentation on their offer to an evaluation committee at SAC. Vendors will be required

to provide clarification, if called for, by the evaluation committee, on any matter related

to offer.

6. Vendors may further note that SAC also reserves the right to reject an offer, if there are

any deviations in the commercial and/or general terms and conditions offered against the

requirements as per this RFP, even if the offer is technically suitable.

7. The responsibility of safe transportation / delivery of total system to the site rests with

the Vendor. This includes:

(i) Transportation from factory to the site

(ii) Loading / unloading where applicable during transportation.

(iii) Transit insurance

All expenditures for above activities shall be borne by the Vendor. SAC will provide

custom duty exemption certificate, whenever applicable and requested.

The vendor must project the requirements like custom duty exemption (CDEC) etc., at the

time of Bidding.

E. Preparation and Submission of Bids Bids shall be submitted in two separate parts in sealed envelopes.

Part-1(Technical): This part should contain complete technical proposal. This section

should bring out complete clarity on the total work involved including conceptualization,

implementation and performance. This part should include following information but not

limited to:

a) Technical Compliance Statement (Point by Point Compliance) to full RFP including

all tables by the vendor

b) Subsystem details with complete specifications

c) Implementation details including subsystem I/O interface details, signal flow

diagram, level diagram etc.

d) The level diagram shall indicate the nominal power input and output of each

subsystem and should ensure that none of the subsystems in the receive chain goes

into saturation

e) Complete Mechanical details (Indicative FE Analysis for antenna assembly and

support structure against RF specification, critical frequencies, Housing details etc.)

f) Complete Civil Work requirements (Antenna Pedestal design, etc.,) also include

interface links between outdoor and indoor systems and related construction works.

A suitable A/C shell may be offered at the antenna site for indoor systems housing

g) Time Schedule with reference to major milestones

h) Comprehensive onsite Warranty for three years

i) Comprehensive Maintenance plan considering 24x7 uninterrupted operations after

completing 3 years of warranty.

j) This should also include spares policy, plan for preventive and corrective

maintenance or any other relevant details during warranty and CAMC.

k) Obsolescence management plan

l) All papers and documentation of part-2 Without Price (Price masked).

m) All the sub-systems must be quoted (Price Masked) along with make and model

number

n) Unmasking of the price in technical bid will lead to disqualification of the bid

without any further queries

Part-2(commercial): Commercial offer covering entire scope of activity, giving complete

cost break up, of the following but not limited to:

a) Cost of site preparation and civil work for antenna foundation (pedestal).

b) Cost of Antenna & RF subsystem with options, if any

c) Cost of proposed spares with list of deliverable

d) Cost of CAMC

e) Cost of Comprehensive Maintenance Contract (CAMC) for three years after

warranty and subsequent extension for additional 4 years in slabs of 1 year.

f) Any other costs such as integration, fabrication, testing, licensing etc. which are

not reflected above, towards realization of systems under the scope of this RFP

Vendor is requested to quote the complete system in two different slabs of

Quantity one and Two.

SAC reserve the right to place PO for quantity one or Two as per the final

requirements

In case of ordered quantity is one then site will be either Delhi or Ahmedabad and

if ordered quantity is two then Ahmedabad and Delhi will be the two sites

L1 criteria will be on the complete supply of all items mentioned in the RFP.

However, the quantity of items (For Ahmedabad site only or Delhi site only or for

both sites) will be decided by the TEC and same will be considered for L1.

F. Delivery schedule The supply, installation and commissioning of the antenna system should not exceed

12 months from the date of placing the purchase order. SAC made feed for the

antenna will be ready by 6 months from the date of placing the PO. The vendor should

collect the SAC made feed from SAC campus. Vendor has to separately give the

project implementation schedule

G. Technical Specifications

Table-2:

KU-BAND RECEPTION SYSTEM SPECIFICATIONS

SL NO PARAMETERS SPECIFICATIONS

1. Feed Configuration Cassegranian, Monopulse, Receive only, Two

port

2. Main Reflector Minimum of 11 M diameter Shaped

Parabolic

3. Main reflector and Sub-reflector

surface accuracy

0.3 mm RMS and 0.15 mm RMS

respectively or better

4. Frequency Range 10.7 to 12.75 GHz

5. Feed Polarization Linear, Simultaneous Vertical and Horizontal,

orient-able

6. G/T Better than 37.9 +20log(f/10.70GHz)

dB/deg K @20 deg EL

(Vendor to provide G/T break up in the technical bid)

7. Feed VSWR 1.3:1 (Maximum)

8. Radiation patterns & side lobe

level As per ITU-R Rec.580-5

9. Cross polarization Isolation 35dB minimum within 1dB beam width.

10. LNA noise temperature Better than 70 Deg K

11. LNA System Tri-redundant configuration

12. L-band output frequency 1200MHz +/- 250 MHz

13.

Spurious @ receive L port at

nominal output power

Less than – 65dBc

14. Antenna Mount EL Over AZ

15. Servo Drive Geared Servo motor with feedback

16. Operational Modes Auto Track(mono pulse)/Step Track/ Program track

/Adaptive Track/ Manual 17. Azimuth travel range 0-180 Deg Continuous

18. Elevation Travel range 0 to 90 deg continuous

19. Velocity (AZ and EL axis) 0.01-0.25 Deg /sec in both axis ,

simultaneous movement should be

possible for both axis

20.

Travel Limits

Hardware and Software Limits for

1. Azimuth CW, CCW

2. Elevation UP, DOWN

21. Polarization Travel +/-90 deg CW and CCW motorized Remote &

Manual Control

22. Pointing errors(RSS Peak) Max. 1/5

th of 3dB beam width at operational

wind velocity and occasional gust

(Vendor to provide break up at the time of

bidding)

23. Tracking errors(RSS Peak) Max. 1/10

th of 3dB beam width at operational

wind velocity and occasional gust

(Vendor to provide break up at the time of

bidding)

24. Angle display Resolution 0.001deg in AZ and EL

25. Monitoring & Control Local/Remote (Ethernet with TCP/IP Protocol)

26. Wind Velocity Operational: 70kmph, Min

Survival (on stow at zenith):

200Kmph, Min

27. Tracking plate , tracking LNA, Tracking downconverter, Tracking

receiver, ACU, 1:2 LNA system, downconverter (Ku Band) shall be

the responsibility of the vendor

Figure 1 Ku Band Data Reception System

1. System Description

‘Ku Band Rx only Earth station or Ku-Band Data Reception System’ consists of Antenna &

Feed, tracking pedestal, RF systems, Servo system and Mechanical systems. Complete block

diagram (indicative) of the Data Reception system is shown in Figure 1.

The Ground Station shall have Ku-Band G/T 38 dB/0K. The antenna diameter shall be

minimum of 11 m to meet the G/T requirements. The Reception system should be capable

of receiving vertical and horizontal linearly polarized signals simultaneously in Ku-Band.

The operating frequency range for Ku-Band is 10.70GHz to 12.75GHz. All reception

parameters should meet the specifications over the operating frequency range.

Tracking in Ku-band where half power beam width is approximately 0.18deg is very critical.

Tracking accuracy of the order of 1/10th the 3 dB beam width is required for successful

acquisition and tracking of Geo-Imaging satellite. Sufficient care should be taken in realizing

the components for better noise figure in Ku-Band. Separate tracking receiver and tracking

down converter must be planned for the antenna tracking purpose. The converter sub systems

should be placed near the antenna pedestal in an air conditioned environment to reduce the

cable loss and the high speed fibre optic cables can be extended from the antenna pedestal to

the Baseband room where the demodulators are present. The maximum distance of OFC will

be 500m.

In Ku-band, received signals will be QPSK modulated at the data rate of 200Mbps per

channel. This RFP belongs to supply of antenna and RF subsystem as mentioned in the figure-1.

The baseband system shown in the diagram is not part of this RFP. The vendor has to supply

necessary OFC link to extend the IF signal to baseband system.

The system should track the satellite in Ku-Band monopulse auto-track mode. The system

should operate in fully automated environment and it should also have full autonomy to meet

any contingency requirements.

The Antenna system pedestal shall be designed to withstand heavy winds, earth quakes,

vibrations etc.

a. RF Systems

RF Systems comprises of Antenna & Feed systems, Main LNAs and tracking LNA, Down

converters, Tracking downconverter and Tracking receiver, High Speed Fiber Optic Data

links. Feed system will be the supplied from SAC.

a. Antenna & Feed System

The Cassegranian Antenna system shall have main parabolic reflector and a hyperbolic

sub reflector with Ku- Band feed. The diameter of the antenna shall be at least 11mts,

Antenna system shall have minimum 38 dB/0K. G/T value in Ku-Band at 20

0 Elevation.

Ku-Band feed which is supplied by SAC will have the capability to receive data

simultaneously in both vertical and horizontal polarizations. Feed will have the port to

enable capability to track (monopulse) in any one of the polarization in Ku-Band.

Precision photogrammetric alignment of the reflector at the expected operating angles for

superior performance is required.

b. 1:2 low noise amplifier assembly

The specifications of 1:2 redundant low noise amplifier assembly is given in Table-3

Table -3: Specifications of 1:2 low noise LNA assembly

Frequency Range 10.7 - 12.75 GHz

Noise Temperature 70 Degree K

Gain 60 dB

Gain Flatness over the band: ± 1.7dB

Input VSWR 1.3:1 max

Output VSWR 1.3:1 max

Output Power @ 1dB Comp +10 dBm

Third Order Intercept Point: +20 dBm

Input Connector: WR 75 W/G with flange CPR-G

Output Connector: N-Type (Female) or F-Type or compatible to

down converters

Controller specifications

Unit status monitor method: Controller monitors unit current. Alarm is generated if current

goes out of allowed tolerance window

Switch Over Time: 100ms

For M&C operation RS 232 or RS 422 INTERFACE facility to be provided in the control

unit.

Controller Dimension: 19 inch standard rack mountable

LNA complex and controller interface cable Length: 50 meter long cable with connectors

Dual AC Input with 87-265 Vac. 47 to 63 Hz

Operating Temperature: 0 to 50° C

c. Down Converters

Data signals shall be down converted from Ku-Band [10.7GHz-12.75GHz] to 1.2 GHz

Frequency (IF) using single stage down conversion. The satellite signals are received in two

bands (i.e 10.7-10.95GHz band and 11.2-11.45 GHz Band). The down converter should be

able to convert this band of frequencies to L Band IF i.e 1200+/- 250 MHz. All RF

components in the receive chain should be suitably selected to handle the required IF

frequency of 1200MHz +/- 250MHz. The exact length of the OFC link will be

communicated at the time of PDR. Ku-Band Data down converter outputs in pedestal are

fed to Fiber optic link to transmit the Data IF to the QPSK Demodulator in the base band

room.

Ku-Band Tracking Down-Converter shall have built in synthesizer to configure the

tracking frequency. The output of the tracking down converter shall be the input to the

tracking receiver, which is tunable to required tracking frequency. The tracking

downconverters should be able to take the inputs from the main LNA as well as tracking

LNA and should be able to set the gains for each channel independently. Signal from

tracking down converter is fed to tracking receiver where delta errors for Ku-Bands are

generated. The down converter specs are given below in Table 4.

Table 4: Down Converter Specifications

Parameter Specification

Input Frequency 10.7 GHz -12.75 GHz.

Input dynamic range -20 to -70dBm

L.O Signal Built-in Synthesizer

L.O range 9.50- 11.55GHz

Final IF 1.2 GHz

Conversion Gain 25 dB ±1 dB

Resolution 1KHz or better

Harmonics < -40dBc

Spurious <-70dBc

Stability 1X10-9

L.O Phase Noise -100 dBc /Hz @10KHz offset

L .O. Output Power -7dBm +/- 3dB

Remote Interface TCP/IP

Input /Output

Impedance

50 ohms

Input return loss better than 18 dB

Output return loss better than 18dB

I/O Connectors SMA (F) or compatable with LNA assembly ports

d. Fiber-Optic Link interface

Vendor shall supply the required high speed Fiber Optic (FO) channels from antenna to

baseband room for a maximum distance of 500m. All data signals shall be routed through

FO links from antenna to baseband room. The 12 core FO armored cable, Light interface

units and F.O Transmitter/Receiver modules are to be installed at both ends. All weather

proof fibre optic cables should be used. The L Band signal cable received at the base band

room should be compatable to interface with the Demodulators. Parallel L Band

monitoring port should also be provided

2. Antenna Control Servo System

a. System description

Broadly the system can be divided into the following sub systems.

� Remote Antenna Console (RAC)

� Antenna Control Unit (ACU)

� Brushless Servomotors.

� Suitable servo drive amplifiers.

� Encoder boxes with angle sensing transducers and limits.

� Drive electronic interface including interlocks and drive related processing.

� Network Elements

b. System operating modes

The Antenna Control servo system shall have extensive operational modes to meet the

antenna requirements for orbiting satellites. The system shall have two operating control

environments. One is “Local mode (operator control)” from Remote Antenna console (RAC)

or Antenna Control Unit (ACU) at Antenna pedestal room and another is “Remote mode” via

Station Control Computer (SCC) system from Earth station control room.

The system shall support all operating modes, which are described below.

(i) STANDBY MODE:

Standby mode stops the antenna, engages the brakes, and inhibits the drive amplifiers. Once

in standby mode, the system needs to be commanded into another operational mode either

locally or remotely. While in standby, the ACU will continue to monitor status, alarms and

display them in the status display.

(ii) SLEW RATE MODE:

In this mode the antenna is continuously moved at a constant rate (selectable) with position

loop control in both axes independently. Slew mode allows the user to slew the antenna at

variable speeds in Azimuth or Elevation or both. The azimuth and elevation axes can be

positioned to any angle, and at any rate from approximately 0.1 to 0.25 deg/sec, within their

specified operational travel limits.

(iii) MANUAL MODE:

In this mode the Antenna Control System moves the antenna by the command angle

generated by a hand-wheel positioned near the ACU/RAC. Alternatively, the antenna shall be

controlled up/down by arrow keys of the keyboard allowing step response around the current

position. The step value is programmable independently for AZ and EL axes. If the specified

angles are within the limits of the azimuth and elevation axis, the pedestal immediately points

the reflector to the requested angles. The antenna angle is digitally compared to the command

angle to generate position error.

(iv) AUTO TRACK MODE:

This mode is one of the main operational modes of ACU. In this mode the ACU controls the

antenna to point the target accurately with the signal produced by the tracking receiver.

The Auto mode augments the manual or program mode by switching to auto track mode

when the tracking receiver locks on the downlink signal. Auto Enable monitors the selected

tracking receiver (Ku-band) AGC and ACQUIRE / LOSS status. When the received AGC is

greater than the acquisition threshold, the receiver status indications become valid and Auto

Track Enable is selected, then ACU switches to the Auto track mode. A good tracking signal

is required to maintain Auto track mode. The ACU monitors the Ku-Band tracking receiver

AGC lock status.

(v) PROGRAM MODE:

In this mode, the present antenna Azimuth and Elevation angles are compared with the pre-

determined satellite look angles with respect to time, and position errors are generated

corresponding to the angle difference. Thus the antenna is servo controlled on the angular

positions received before satellite tracking either from the Remote computer (RAC) or by the

look angles generated by the ACU based on the satellite ephemeris data.

(vi) DESIGNATE MODE:

The designated preset memory allows the operator to save at least 25 targets (Such as satellite,

bore sight, stow lock etc.) configurations. A target configuration includes Az and El position.

The ACU shall have the databases to achieve the above function.

Pointing database that allows the user to enter an object based on its azimuth and elevation

positions.

(vii) COMAND ANGLE MODE:

In this mode, the user will feed the required AZ & EL command angles through GUI

interface, and the servo system must position the Antenna to the commanded AZ & EL angles

at a pre-determined speed taking care of cable wrap position.

(viii) AUTO SEQUENCE MODE:

In this mode the user can stack different modes on top of each and designate thresholds and

boundary conditions for transitioning from one mode to the next. The initial pointing mode

and the priority of stacking the modes shall be user programmable.

Various configurations of stacking of modes are possible depending upon the mission

requirement. For example the operator may stack modes in the following manner.

Manual mode�Program mode � Auto TRACK MODE

Operationally the user can pick an initial pointing mode such as Program mode or manual

mode. The ACU would position the antenna in azimuth and elevation based on the angles

generated from ephemeris data or manually loaded look angles.

Once AGC level exceeds the Acquisition (Ku-band) Auto receiver threshold, the system

begins to Auto-track on the Ku-band signal (Acquisition Auto).

If the signal drops below the threshold level the system backs down to the previous mode, at

any stage of the “automatic-acquisition and tracking process”. The operator can set the signal

thresholds of the tracking receiver for transitioning from Program Tracking to Ku-Band Auto

Tracking. At any time in this process, the signal level exceeds the pre-defined threshold; the

system shall begin the Auto track.

(ix) SUN/MOON/STAR TRACK:

The ACU Mode-Display-window includes both Sun,Moon and Star Track modes. When Sun

or Star Track is selected the antenna is commanded to track the sun or the star using an

ephemeris program that is resident in the ACU. These modes are useful for G/T measurement,

alignment and system calibration. The ACU shall have the following databases to achieve the

above function.

• Star Database that is predefined with the most common stars.

• Sun.

• Moon.

c. System safety interlocks

The System shall have facility to manage the following interlock functions for the safety of

the antenna and control the overall system operation sequentially. Following are the interlock

functions to be incorporated into the system algorithms/hardware circuits.

(i) CONTROLLER (ACU) ON/OFF

This ensures that all the elements of Controller such as PC, monitor, and Control Electronics

are powered ON. ACU OK indicator ensures that the ACU is ON and communicates with

RAC.

(ii) ANTENNA DRIVE UNIT (SERVO DRIVE) ON/OFF

This ensures that elements of Antenna Drive Unit (positioned at the antenna room) such as

DC power supplies, Drive Amplifiers, Drive Electronics, and Exhaust fans in the Antenna

Drive Unit are powered ON.

(iii) EMERGENCY STOP

Emergency stop switches are provided at the Antenna pedestal, ACU and RAC to stop the

antenna movement abruptly, in case of any emergency situation or for maintenance of the

Antenna Control Servo System. The interlocks shall trip the AZ/EL axes.

(iv) AZ. AXIS ON/OFF

Az. axis can be ON only when at least one motor and corresponding Drive amplifier is ready

for azimuth axis movement subject to normalcy of ACU and ADU (Antenna Drive Unit)

control electronics. Other pre conditions of interlocks include Emergency stop not activated

and stow is in released condition.

(v) EL. AXIS ON/OFF

El axis can be ON only when at least one motor and corresponding Drive amplifier is ready

for elevation axis movement subject to normalcy of ACU and ADU control electronics. Other

pre conditions of interlocks include Emergency stop not activated and stow is in released

condition.

(vi) AZ. STBY/EL. STBY

As explained in the modes of operation, stand-by status is a pre-condition for antenna

operation in any of the tracking modes described. The stand-by interlock status ensures that

All the alarm conditions are non-existing and system is ready to activate the drive amplifiers

and motors.

(vii) AZ. AND EL. MOTOR BRAKE RELEASE

The servomotors are equipped with built in fail-safe electro-magnetic brakes. The brakes

shall be released first, before applying the rate command/control enable signal to the

amplifiers in all operating modes. The brakes will be applied when the system is kept in

standby mode.

(viii) ANTENNA TRAVEL LIMITS (Pre-limit and limits)

For the safety of the antenna and interface cables, the antenna movement is restricted to safe

operating limits. Limit switches fixed on the antenna drive pedestal will operate and signals

from these switches are fed back to ACU/Drive interlocks.

i) HARDWARE TRAVEL LIMITS:

a) PRE-LIMITS: As the name suggests when the pre-limit reaches, it is an advance

notice to the operator that the antenna is in the limit zone and close to final limits and the

antenna speed is reduced. Respective Pre-limit indication flashes on the screen and the

maximum rate input will be limited to 1.0 deg/sec.

b) FINAL LIMIT: The antenna will be stopped at this point and further movement is

restricted when the final limits are reached. Respective Limit indication will be displayed on

the screen with audio alarm. To come out of the limit condition the operator has to give

reverse command depending on the actual limit direction.

ii) SOFTWARE LIMITS AND PRE-LIMITS:

In addition to the hardware switch arrangement for the travel limits, the ACU will have

software limits. Nominally the antenna movement will be restricted within these limits by

monitoring the angle data directly. On reaching the set limits (programmable) the antenna

cannot be moved further in that direction and allows movement in the reverse direction only.

The pre-limit function is same as hardware pre-limits function as explained above.

All the software limits & Pre-limits shall be field programmable.

(ix) AZIMUTH /ELEVATION DRIVE AMPLIFIER READY STATUS

The synthesized drive ready status of the drive amplifier (motor –1 and motor-2) is

interlocked with the AZ/EL drive enable command so that the drive amplifier is activated

only when the drive is ready and no other faults are existing. Drive Ready is a synthesized

status output from the Drive amplifier.

(x) AZ/EL SERVO MOTOR OVER TEMPERATURE (Motor-1 and Motor-2)

The thermal cut out switch contacts of the servomotors shall be interlocked with the

respective drive amplifier enable command so that the motor is not powered when the motor

rotor temperature rises beyond the specified operating limits. The drive amplifier shall be

tripped when the motor thermal cut out switch is operated.

d. System status display

The RAC/ACU screen shall show a detailed system status. Following are the parameters to

be displayed on the RAC/ACU operating screen. All error messages and system faults,

operator prompts, menus etc shall be in plain English or easy to remember abbreviations or

mnemonics.

1. Azimuth and Elevation antenna position in deg (0.001 resolutions).

2. AZ and EL command position in deg (0.001 resolutions).

3. Difference between Antenna and Command position in deg (0.001 resolutions).

4. Operation mode.

5. Azimuth limits and pre-limits.

6. Elevation limits and pre-limits.

7. Azimuth and Elevation rates in degrees/sec

8. AZ and EL Drive currents in Amperes.

9. Azimuth Drive system fault status.

10. Elevation Drive system fault status.

11. Tracking system parameters like Signal strength, lock status and Tracking errors

for two auto track chains (Ku-band).

12. Graphical representation of Tracking receiver AGC and Tracking errors.

13. Universal Time (ddd: hh:mm:ss) and date.

14. Local time (hh:mm:ss).

15. ACU Active/hanged status.

16. Position loop lag errors in graphical form (Auto, Program and CDM).

e. System functional requirements

The Antenna Control Servo system shall meet the following functional requirements.

• Control the antenna in various defined operational modes.

• Steer the antenna at the maximum specified rate and acceleration in Azimuth and

Elevation axes.

• Interlock functions for sequencing operations under various operating modes and

provide safety of Antenna, drive Amplifiers and brush-less DC servo motors. A hard-

wired EMERGENCY STOP switch shall be provided on the front panel of RAC and

ACU.

• Logging of angle data and transmission to station computer as per the

specified format and rates.

• LAN interface - shall support TCP/IP network configurations.

• Reception of Satellite ephemeris from station computers and generation of look

angles locally.

• 24 x 7 Automatic operations.

• Automatic selection of Bandwidth/gains in all tracking modes (Auto, Program)

based on user defined options through configuration files.

• M&C functions, Status transmission to Monitoring and Control System in

the specified format and interval

• Configuration control for important software controls like encoder bias, time offset,

adaptive bandwidth selection i.e. wide/narrow, loop gain, angle offset, data rates,

Single / Double motor drive etc.

• Hardware and software antenna coverage limits.

• Interlocks for all alarm features, Motor brakes, Stow lock, Emergency stop, cable

wrap indication etc.

• Built in Test and evaluation and system diagnostic functions.

f. Required Features & Functions of ACU

• Software Configurable servo loops

• Real time data logging, fault indication and event logging

• Provision to give offsets to Azimuth, elevation and time during Real time

• Polarization control

• Programmable Software and Hardware limits

• Self-Test Diagnostic Tools for all Sub Systems

• Antenna Brake Protection circuit.

• Safety Limits and Interlocks

The antenna control software should have the capability to track the satellite in real-time in

Auto track / step track / Adapt track/program track mode. The required functions of the

Antenna Control software are:

• GUI to display the station configuration

• Positioning the antenna to satellite lookup angles

• Automatic configuration of the sub systems

• Control system software tools for modeling, estimation & compensation of

systematic errors of Antenna mount, Antenna droop etc.,

• Dynamic friction compensation

• Real time monitoring and data logging.

• Implementing different tracking modes

• Implementing different acquisition modes

• Utilities to carryout different servo tests like velocity and acceleration tests,

• Data logger to monitor and log different engineering parameters of ACSS system.

• Display of safety limits and Interlocks.

• Utilities to track Sun/Star/Moon.

g. Remote antenna console (RAC)

The RAC shall be a 19” Rack mount Industrial PC with 24” TFT LED display monitors 2nos

(HP or Dell), wireless keyboard and mouse. The RAC shall be configured with the M&C

Windows-based operator interface providing local GUI operation as well as the Servo Test &

Evaluation Toolkit allowing for comprehensive diagnostic and performance monitoring. The

RAC provides the interface to remote operations via the local area network (LAN). Refer

block Diagram.

System control software and software tools The software shall broadly have the following packages. The software shall be based on latest

Windows/LINUX server Platform and provide a suite of system monitor, control and

diagnostic tools.

1. ACU M&C windows application software

2. RAC M&C windows application software

3. Instrumentation Software: Consists of Test and Evaluation software

The antenna control software should consist of TCP/IP interface to facilitate remote

monitoring and control of servo system.

h. ACU M&C windows/LINUX application software:

This shall be the real time servo software that resides in the ACU. This software shall provide

servo loop compensation, status & control processing, interfaces to the ADU, remote

interface to RAC and front panel software interface. All inputs and outputs are configurable

via a setup file local to the controller or down loaded via the remote interface.

Application Software shall run under Latest Windows/LINUX or higher server Operating

system and shall have the following features.

• User friendly and intuitive graphic user interface, remotely operatable.

• Extensive use of digital signal processing.

• Upgradeability and flexibility.

• Dual-Axis Torque bias control .

• Digital servo compensation.

• Data logging.

• Generation of look angles based on satellite ephemeris.

• Remote down loading of Time tagged Satellite look angles.

• Built in test functions.

• Self Test

• On-line help system.

• Customization facility for control parameters through configuration files.

i. RAC M&C windows/LINUX application software:

RAC M&C software shall be the primary interface for operators, supervisors and

administrators to control and configure the antenna.

RAC M&C software shall provide the latest Windows/LINUX or higher server based

operator interface for the control and monitoring of antenna system, down converters,

tracking system. The software provides local control of the antenna at the given site. The

remote M&C interface allows for remote control from a central site via M&C system. The

software features shall include:

• Intuitive, graphical monitor & control.

• Satellite database with ephemeris.

• Look angle generation

• Monitoring and controlling functions.

• Configurable alarms and status via initialization files.

• Multiple window interface for system configuration, monitor and control.

• Flexible system configuration.

• Tracking Aid Display (Bull’s eye etc)

j. Instrumentation software/diagnostic tools

The instrumentation software shall establish the initial antenna performance baseline. During

the Periodical performance evaluation and Test & Evaluation activities, the tests can be

repeated again and compared against the baseline. Following test capabilities shall be

incorporated in this software tool. The resulting test data is plotted on software based strip

chart recorder (Data Logger) and saved. Provision for printer/plotter interface shall be made

available.

1. ERROR SENSITIVITY (S-Curve) TEST: To plot position error generated in Ku-

Band auto track mode

2. STEP RESPONSE TEST: The step response test executes tests to evaluate the

responsiveness and stability of the antenna servo system by recording the position/rate

of the antenna verses time in various operational modes. Step response of Auto track

can be performed by pointing the antenna to the bore site source. Rise time, Settling

time, % of overshoot and bandwidth shall be computed, logged and displayed.

3. VELOCITY/ACCELERATION: The velocity and acceleration test is designed to

measure the maximum velocity and acceleration of the antenna servo system.

Velocity and acceleration measurements can be made for both dual and single motor

cases.

4. SATELLITE TRACKING PLOTS: To record, display and store Antenna

Azimuth/Elevation position/velocity/Acceleration vs time during the satellite pass.

k. Antenna Motor & Drive System

Digital Drive Amplifiers must be high efficient 3 phase Space Vector PWM IGBT based

power amplifier to drive the brushless servo motor. There are total four power amplifiers each

axis will have two power amplifiers. Servo Controller with built in power supply and

Ethernet interface for configuration, control & monitoring of current, velocity, fault & status

indication. Suitable drive amplifier with the following features is required.

• Integrated Power Supply and controller with all the protection circuits.

• Dynamic brake facility.

• Configurable for Velocity / Torque modes.

• Programmable control parameters.

• Potential free contacts for interlocking the drive amplifier.

• Resolver/encoder interface

• Ethernet interface for remote monitoring & control

• Provision for monitoring current, faults, status etc.,

• Protection features

Table 4: Brush less servo motor specifications

Make Leading Manufactures like ABB/Parker/any other Proven international

Brand

Stall Torque

Suitable to the Antenna load as per system specifications for tracking

Geo-Satellite

Peak Torque

Rated Speed

Rotor inertia

Insulation Class H

Protection Thermal sensing switch on stator winding. Cut off @ 150°C

Attachment Resolver

Built in brake Suitable to the Motor

Cooling Natural air cooling. (No Blower)

Connection Flange mounting, standard type

Drive shaft Standard type with key

Protection IP 65 class with oil seal

Interface Through MS Circular/Mil Connectors.

l. Drive Amplifier Specifications

Compatible with the above Brushless servo motor. All digital drive designs are PWM

controlled converter with 3-Ø-power configuration using IGBT or any advanced design.

Integrated Power Supply and controller with all the protection circuits with dynamic

braking facility.

Table 5: Drive amplifier specifications

Make ABB/Parker/ Any other proven international brand

Drive Input voltage 415V, + 10%, 3-Ø, 50Hz or Standard Indian Power

Supply.

Continuous current

Suitable to the Motor selected Peak current

Power Loss at Continuous Current

Efficiency 95%

Configuration Modes Velocity / Torque

Drive Amplifier to Motor

connection

As per the requirement at site.

m. Antenna Drive Unit

The ADU houses the BLAC servo drive unit that includes four Pulse Width Modulated

(PWM) servo amplifiers to drive the azimuth and elevation Brush-less servo- motors.

The drive unit operates as a velocity loop with torque bias set by the ACU to

minimize backlash and maximize pointing and tracking accuracy. The torque bias

parameters are configurable in the ACU to optimize performance.

The ADU also provides power and interface points for the discrete I/O antenna points. The

ADU includes all the required power supplies for Drive amplifiers, drive electronics,

switches, stow pins, alarms and motor brakes. These status points are controlled and

monitored by the ACU.

The ADU shall be built with RFI shielded enclosure. The ADU is equipped

with the following sub systems

• Power switching and control

• EMI/EMC Filtering Chokes

• DC power supplies, control circuits

• Current limiting fuses, Circuit Breakers.

• Pulse Width Modulated (PWM) servo amplifiers.

• Transformers, dynamic braking resistors

• Line reactors

• Emergency stop etc.

In Addition to above, additional subsystems/components may be added to meet the

requirements.

n. ADU Functional Specifications:

• Controlled power up/ down sequencing

• ON / OFF control for Each motor drive

• Single motor drive operation in the event of motor / drive failure.

• Interlock device on the door.

• Emergency stop switch on the front door of the drive unit.

• Built in power line conditioner with over load protection for RFI/EMI suppression, at

the power input point. Additional heat sink for dynamic braking resistors.

• Easy access to remove drives when faults are detected.

• Interlock device on the door.

• All contactors and brake coils shall have transient suppression devices.

• All relays shall be protected with flywheel diodes and LED indicators

• Local operational panel (Plug in control module) with limited control options as given

below.

Azimuth axis ON/OFF.

Elevation axis ON/OFF.

Azimuth Mode ON/OFF.

Elevation Mode ON/OFF.

Emergency ON/OFF

o. Mechanical Aspects:

• Proper cooling arrangement with built in air filters and exhaust fans.

• Physical dimensions and layout addressing all the aesthetic and human engineering

aspects, for elegance and operator comfort.

• All the rack mounted sub systems (if any) shall have sliding arrangements providing

easy access for maintenance.

• Cable Entry Duct & Connector I/F Panel

• Standard cable entry ducts and power distribution systems.

• Proper grounding and grouting arrangements shall be made.

p. Encoder Box

The Encoder box shall house absolute rotary shaft encoder for antenna position sensing,

internally connected with anti-backlash gear train. The input to the encoder box shall be

derived from the antenna Azimuth/ Elevation slew ring bearing having internal gear teeth.

Table 6: Absolute rotary shaft encoder specifications

No .of turns single turn

Absolute position Values 4194304/revolution (22 bits)

Flange Synchro Flange

Data Interface Serial Synchronous

Power Supply 5–30 Volts DC ± 10%

Absolute Signals Pulse, Serial with error detection

Type of Code Grey or Pure Binary, synchronous

Cable Length to ACU 50 mts

Protection IP 67 for housing, IP 66 at shaft inlet

3. Mechanical Systems:

a. Description of the Antenna mechanical sys tem

The Antenna mechanical system can be broadly divided into three categories,

namely

1. Tracking pedestal (AZ and EL mount)

2. Reflector and Sub reflector assembly

3. Feed system sub assembly

In the proposed Antenna & mechanical system, Reflector dish is mounted on a 2 axis

mount (Tracking Pedestal) which can scan the entire sky. The mechanical system

consists of Aluminum or Carbon reinforced Reflector supporting the Feed and

Hyperbolic Sub- Reflector through a Quadruped/tripod, an Antenna mounting frame

attaching the Reflector to a pair of Yoke arms with Counter weight arms, an Elevation

housing containing the necessary drive system for movement about an Elevation axis

between the horizon to zenith and Azimuth housing containing the drives to achieve

required rotation 0 to 180 Deg in Azimuth in Continuous mode to enable pointing the

antenna to any GEO satellite. The Rigidity of the mount, reflector & foundation

should be able to provide the required pointing & Tracking accuracies.

b. Mechanical considerations for Antenna Design

Design aspects:

1. Accessibility, Reliability, Maintenance and fail safe operations.

2. Reduce the weight of the reflector and increased stiffness

3. Antenna deflections are within the limits of pointing error and reflector RMS value at

specified wind loads and operational temperatures.

4. Compact and rigid design of AZ/EL axis housings.

5. Overall Surface accuracy of the main and sub reflectors.

6. Axis Alignment i.e. Orthogonality between Azimuth and elevation.

7. Structural deformation due to wind, Temperature and gravity. The reflector back up

structure needs to be strengthened. The required Structural stiffness of the reflector has

to be estimated.

8. The individual panel fabrication error to be accounted considering the manufacturing

tolerances in stretch forming process. The field setting errors using photogrammetric

technique should be accounted.

9. Minimum Gear backlash, less thermal deformation of reflector and encoder alignment

directly to the axis shaft to achieve the overall pointing accuracy.

10. The pedestal errors have to be made barest minimum with optimum design and high

precision machining and quality control.

11. Due to high pointing accuracy requirement, high precision fabrication of mechanical

components and sub-assemblies are to be carried. Stringent tolerance specifications are

to be made, measured and accounted properly.

c. Structural analysis, design and fabrication details

1. Reflector panels, backup structure (stiffeners) of Antenna system considering operational

wind speed of 70 kmph, survival wind speed of 200 kmph and inertial effects of

movements in Azimuth & Elevation directions.

2. Feed cone & wave guides structure.

3. Design check of structural elements for the temperature variations of 00C- 55

0C for

differential temperature variations of 50C.

4. Design of radial panels with glued stiffeners with durability criteria of adhesive used.

5. Provisions for lightening arrestors, aviation lamps and other functional apparatus.

6. Counter weights required to balance the antenna about elevation axis.

7. Interface structures like yoke arm, yoke fixing structure, Antenna mounting frame

between the Antenna and Tracking pedestal.

8. Design of suitable gear boxes for AZ and Elevation axis.

9. Design of suitable couplings between gear box and motor including selection of suitable

motors.

10. Design of suitable slewing ring bearings for AZ and EL considering operational and

survival wind load factors of antenna and pedestal structure.

Surface Coatings:

All the structural components are to be coated with suitable anti corrosion type of paints and

the technical specifications of the paint used are to be provided.

d. Civil works for Antenna Pedestal

1. The civil works activity starts after completion and approval of the Antenna

structural and Mechanical design by SAC team

2. Civil foundation design has to be provided by the vendor.

3. The housing for the RF electronics at the antenna pedestal will be carried by the

vendor taking into consideration civil structural inputs (Operational & survival

environmental conditions like wind, earthquake resistance etc.).

4. Reliability & QA requirements

The operational life of the complete Antenna System (including drive, bearings and other

moving parts of the antenna, RFsystems, Servo Sub-systems and control systems) is expected

to be at least 10 years (preferably 15 years). The Antenna System will be operational 24x7

in automatic mode/remote control mode. Vendor has to suggest the list of spares required for

the proposed system. The vendor should project the redundancy requirement in all the

subsystems. Electrical and Mechanical characteristics of proposed Reception system shall

comply with the (EIA standard) EIA-411-A document. All Sub-Systems should comply with

CE standards. The station will be operating under controlled environment. However, the

equipment used shall have the capability to withstand the following environmental condition

complying to IP 65 environmental protection.

Table 6: Indoor Unit Environmental Specifications

SL

NO

Parameter Value

1. Operating temperature 0 to +350 C

2. Storage temperature 0 to+650 C

3. Humidity 80% RH non condensing

Table 7: Outdoor Unit Environmental Specifications

SL

N

Parameter

Value

1. Operating temperature 0 - 600 C

2. Storage temperature 0 - 650 C

3. Humidity 95% RH @ 400 C with condensation 4. Rain >= 200 mm/Hr

5. Wind Speed

Operational

Operational 70 KMPH

Survival to Stow 200 KMPH

5. System Installation & Integration

The vendor shall be responsible for installation and commissioning of the Ku-band Reception

System at SAC location and/or Delhi Earth station, New Delhi. Vendor should demonstrate

its functionality in its full configuration at user site for final acceptance. Final acceptance of

the system will be done only after installation at user site in its full configuration.

Programme Clauses

DELIVERY / SCHEDULE: The reception systems will be supplied and installed at SAC

Bopal campus, and/or Delhi Earth station campus within 12 (twelve) Months time from the

date of the Purchase Order.

WARRANTY: 36 Months from the date of Acceptance at the site.

The warranty shall cover any material defect, workmanship including SOFTWARE BUGS

are to be fixed if any. For spares supplied, warranty shall be from the date of acceptance.

SITE ACCEPTANCE AND TRAINING: ATP will be conducted with SAC Engineers.

Demonstration of real time satellite tracking in Ku-Band is the responsibility of vendor.

Subsequently On-site/Off-site training will be conducted by the vendor.

SYSTEM SOFTWARE AND UPGRADES: All the Software required for the system shall be

loaded and delivered along with the system. The soft copy of the software on CD shall also

be supplied along with the system. Software upgrades up to warranty period shall be given

without extra cost.

SPARES SUPPORT: Shall support spares for this program for a period of 10 years.

The vendor must have experience of installation and commissioning of Ku-Band antennas,

and also the KU-Band stations installed by the vendor should have been operational

supporting KU- Band data reception for at least one year.

Acceptance Test plan/testing methodology

The system will undergo the acceptance tests as per the mutually agreed test plan at the

installation site (site acceptance test SAT) and user validation. The vendor will be responsible

to arrange the tests in the presence of SAC/ISRO engineers. The tests may be as per the

sequence given below with a detailed test plan and will be finalized latter.

Sub system level test at user site after receipt of the systems

Testing of antenna control and tracking system.

Testing with complete antenna systems

Testing of the Ground Station with Geo-Imaging Satellite(GISAT) in orbit. (optional)

Final acceptance test plan as per SAC laid down procedures

Table 7: Acceptance Test plan/testing methodology

S.No

System under test

FAT

SAT

Method

to

demons

trate in

brief

SPECS

Test

procedure

Comments

1 ANTENNA

SUB-SYSTEM

a) receive

side lobe patterns

b)cross polarization

isolation

c)Antenna receive

gain

d)system noise temp

profile

e) system G/T

f) Mechanical

alignment

2 FEED/LNA a) Feed VSWR

b) Feed port-port

isolation

c) Feed Cross pol

Isolation

e) Diplexer insertion

loss

f) LNA noise temp

and gain

3 DOWN

CONVERTER

a) Frequency

response

4 ANTENNA

CONTROLS

a)ACU in process

tests

b)Limit switch

operation and

calibration

c)Emergency stop

functionality

d)Pointing and

tracking accuracy

e)Resolver

alignment

f)Axes Velocity g)Tracking Rx gain

response

h)Polarization

control and

functionality

G Annexure-1: Comprehensive Annual Maintenance Contract (CAMC)

Scope of Work

Techno-commercial proposals from vendors are invited to provide Comprehensive on Site Maintenance

Services.

Period of contract

The vendor has to execute maintenance as a part of warranty period as per the requirement specified in the

following sections. The vendor has to maintain for 3 years after the completion of warranty period with similar

terms and conditions and extendable for 4 more years

Activities to be carried out by Vendor

The vendor has to carry out following activities.

• The vendor shall carry out On Site Comprehensive Maintenance Services for Earth station located at

Ahmedabad and Delhi

• The details of equipment at Earth station, are as per supply contract of this RFP.

• Preventive maintenance (PM) would be done every six months during the period of contract,

• After every visit, the service engineer should take the signature of the custodian

• For any problem reported by the user, the problem shall be attended to within 24 hours

Terms & Conditions

• The term comprehensive means Vendor will diagnose repair / replace the faulty component / system

/ peripherals / software installed for resources and equipment within given time frame, make system

operational and all expenditure related to CAMC has to be borne by Vendor.

• All logistics like arrangement of required transport of equipments and lodging / boarding for

maintenance personnel will be the responsibility of Vendor.

• In the event of the damages to user’s property or personal injury to user / Vendor personnel due to the

negligence of employee of Vendor, the responsibility shall be solely rest with vendor. ISRO shall not

be responsible for the loss of life of employee of Vendor at the time of performance of contact at user

agency’s premises due to natural calamities / accident explosion etc, if any, the persons engaged by

the Vendor for carrying out the maintenance work will not have any right or claim for regular

employment in any of the ISRO / DOS and these establishments.

• Replacement of defective spare parts shall be arranged by vendor at no extra charge. The replacement

shall be a new part or equivalent functional unit. In case maintenance is held up for spares and if the

system is not working, corresponding amount for each system, which is non functional, shall be

deducted from the bill.

• The faulty part replaced can be taken by Vendor. Vendor should prepare maintenance report for each

maintenance activities carried out and sent to the Engineer -in- charge / focal person.

• As maintenance is comprehensive in nature, Vendor should stock spares of essential nature or as

recommended by manufacture(s).Vendor is required to furnish their spare management plan as part of

their proposal.

• Vendor shall be responsible for all types of charges like lodging, boarding, fares etc for visits to hub

and various nodes.

Contract Manager

a. SAC/ISRO will nominate person as Contract Manager for this contract for the purpose of

matters related to this CAMC. All correspondences shall be marked in his name.

Payment terms

Payment will be made on half yearly basis after completion of satisfactory service. The bill duly

certified by SAC ISRO Nominated personal shall be submitted to Accounts officer, SAC, Ahmadabad

for payment.

Penalty Clause for the CAMC

• The faults reported / lodged from the user must be attended and repaired within 24 hours from the time

of report of compliant. For each subsequent day of delay after 24 hours from the time of lodging the

compliant, 0.5 % of annual CAMC value with ceiling of 10 % of total contract CAMC value of Hub.

Vendor needs to factor and propose sufficient spares & redundancy to maintain this availability.

Termination of contract

ISRO reserves the right to terminate the contract if the performance of the Vendor is found to be

unsatisfactory during its currency of the contract by giving one month’s notice in writing without any

financial implications on either side.

H. Annexure-2: List of Ku-Band Data Reception System Deliverables

1. Parabolic Antenna and Ku-Band feed electronics including LNAs

2. Servo Systems for Antenna control

3. Ku-Band Data and Tracking Down converters

4. Tracking receiver

5. FO link between antenna pedestal to baseband system (demodulators etc,) , less than 500m.