13.2m Ka-Band IOT Stations - datis-group.com Ka-Band... · © 2012 General Dynamics. All Rights...

© 2012 General Dynamics. All Rights Reserved.Confidential and Proprietary

Date: June 2013

13.2m Ka-Band IOT Station

June 2013Page: 2


13.2m Ka-Band Antenna/RF System Overview

• Antenna/RF System Features:• An elevation over azimuth Ka-Band all-steel antenna structure with

high stiffness turntable bearing• 13.2m high precision surface reflector with counterweight arms• Subreflector and quadripod structure • A circular polarized Ka-Band cassegrain 4-port Tx/Rx feed

assembly with TE21 tracking coupler (monopulse) and feed rain blower

• Large 9-foot diameter hub with five foot roll up access door • Redundant HVAC system for antenna hub• Uplink system with 1:1 redundant HPA & Upconverter system• Uplink waveguide network: waveguide assembly from HPA output

to Antenna feed assembly with high power load and offline test switch

• 500W CW linearized TWT amplifiers (HPAs), 1-for-1 HPA redundancy

• Dual channel power meter for transmit monitoring• Calibrated transmit monitor couplers and receive inject couplers for

IOT and CSM

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• Antenna/RF System Features:• LNA Plate with 1+2 redundant Ka-Band Low Noise Amplifiers

(LNA) for communication channel and 1+1 redundant tracking LNA• LNA Plate Controllers with redundant LNA power supplies• One-for-Two redundant Down-converters for the downlink signals• Antenna Control System with Monopulse and Steptrack-based

tracking capability• Test loop translator capability with couplers and switches for

station calibration• Antenna Servo system including variable-speed motor control with

gear-pinion drive for the azimuth axis and machine-screw actuator for the elevation axis

• High precision 25-bit optical for azimuth and elevation axes• Portable Maintenance Unit local control; and Power Drive Unit • A dehydrator system for waveguide pressurization• Aircraft warning lights• RF transmit warning and antenna motion warning lights • An antenna electric hoist for equipment lifting to elevation platform

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• Antenna/RF System Features:• Large access platform with stairway• Electrical and mechanical furnishings• Elevation maintenance strut• Antenna anchor bolts and template• Lightning Protection• Antenna coaxial IFL cables between antenna hub and equipment

shelter• Redundant GPS based timing and frequency system• Uplink and Downlink IF matrix switches interface to customer

furnished BBU’s• Input/output IF patch panels for matrix switches

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Key Performance – 13.2 m Ka-Band Antenna System

13.2m Antenna Performance Performance Parameter Ka Band Reflector 13.2 meter, counterweight Optics Configuration Cassegrain Frequency

Transmit 27.00 – 30.00 GHz Receive 17.70 – 20.205 GHz Tracking (Monopulse) 18.20 – 20.20 GHz

Antenna Gain Transmit @ Feed Tx Port Input 68.37 dBi @ 27.00 GHz

68.97 dBi @ 29.50 GHz 69.08 dBi @ 30.00 GHz

Receive @ LNA Input 65.47 dBi @ 17.70 GHz 66.12 dBi @ 18.95 GHz 66.66 dBi @ 20.205 GHz

G/T (min) @ 10 Elevation, 110K LNA Clear Sky, (includes Feed to LNA losses for LNA Redundancy)

41.41 dBi/K @ 17.70 GHz 41.84 dBi/K @ 18.95 GHz 42.05 dBi/K @ 20.205 GHz

Polarization (Transmit and Receive) Dual Circular (RHCP/LHCP) 3 dB Beamwidth

Transmit 0.06° Receive 0.09°

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Key Performance – 13.2 m Ka-Band Antenna System

13.2m Antenna Performance Axial Ratio @ 1dB BW (X-POL Isolation in dB) Receive: Transmit:

≤0.50 dB (≥30.7 dB) 18.20 – 20.205 GHz ≤0.75 dB (≥27.3 dB) 17.70 – 18.20 GHz ≤0.50 dB (≥30.7 dB)

Port to Port Isolation Transmit to Receive 85 dB Receive to Transmit 85 dB Transmit to Transmit 20 dB Receive to Receive 20 dB

VSWR Transmit: Receive:

1.35:1 Max 1.35:1 Max (18.20 – 20.205 GHz) 1.45:1 Max (17.70 – 18.20 GHz)

Sidelobe Performance ITU-RS.580-6 FCC CFR-47 & 25.209

Power Handling 1 kW CW Per Port, 2 kW Total Pressurization

Operational 0.5 psi Maximum 2.0 psi

Elevation Travel 0 to 90° Continuous Azimuth Travel ±100° Continuous Axis Velocity 0.5 /s Axis Acceleration 0.2 /s2

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Key Performance – 13.2 m Ka-Band Antenna System13.2m Antenna Performance

Azimuth Drive Configuration Gear and Pinion AZ Dual Motor Drives Elevation Drive Configuration Jackscrew – Single Motor Drive Motor Type for Azimuth and Elevation Brushless Servo Motor Antenna Two-Axis Pointing Performance (over 10 degree of axis travel)

0.0083° RMS, No Wind 0.0136° RMS Winds 30 mph gusting to 45 mph

Tracking Performance for Optrack (C/No: 45 dB-Hz)


Tracking Performance for Monopulse (C/No: 45 dB-Hz)


Tracking Modes Program Track Optrack /Step Track Monopulse

Deicing Feed Blower Heated Subrelfector Optional Primary Reflector – Gas or Electric (as required)

Environmental Specifications Normal Conditions Temperature: Wind: Humidity: Rain: Snow, Ice: Altitude: Solar Radiation: Degraded Conditions Wind: Limit of Driving Wind: Survival Conditions Temperature: Wind: Humidity: Altitude: Seismic:

-30 to +55ºC 30 gusting to 45 mph (48 gusting to 72 km/hr) Up to 100%, with condensation Up to 4 in/hr Up to 12 inch/hr To 3280ft AMSL (1000m AMSL) 1.1 kW/m2

45 gusting to 60 mph (72 gusting to 97 km/hr) 60 gusting to 75 mph (97 gusting to 120 km/hr) -40 to +71ºC 150 mph (240 km/hr) Continuous at zenith stow position Up to 100%, with condensation To 3280 ft AMSL (1000m AMSL) 0.3g horizontal & 0.15g vertical acceleration

Design Life >15 years

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13.2m Ka-Band Ka-Band Antenna

June 2013Page: 9


Typical 13.2m Ka-Band RF System Block Diagram

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EIRP Calculation – 13.2m Ka-Band Antenna

Interface Point Gain/Loss (dB)

HPA Output (27 GHz), 0.3 dB Power derating from 27 to 27.5 GHz 75.0 55.9 dBmLoss: HPA to Feed TX Input (54" WR34,plus 3 couplers & 2 switches) -1.15 54.8 dBmEIRP (@ 27.0 GHz) Single HPA 68.4 93.2 dBW

HPA Output (28.5 GHz) 75.0 56.2 dBmLoss: HPA to Feed TX Input (54" WR34,plus 3 couplers & 2 switches) -1.15 55.0 dBmEIRP (@ 28.5 GHz) Single HPA 68.8 93.8 dBW



HPA CW Tube Rated CW Power: 500 57.0 dBmHPA Saturated Rated Power at Flange 415 56.2 dBm

HPA Linear Power at Flange, 4dB OBO, NPR: 19 dB: 167 52.2 dBm

At 30.0 GHz

Antenna System EIRP: 27.0 to 30.0 GHz13.2m Ka-Band Saturated EIRP (500W CW Tube with a CW Rating of 415W @ Flange)

Guaranteed Level

At 29.5 GHz

At 27.0 GHz

At 28.5 GHz

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Typical Hub Layout – 13.2m Ka-Band Antenna

Insert end view

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Typical Hub Photo – 13.2m Ka-Band Antenna

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13.2M Ka-Band Antenna Structure/Mechanical

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•Pedestal– Steel Cylindrical Tower– Counter-balanced Elevation over Azimuth Design

• Machined interfaces for the elevation drive, the azimuth drives and the elevation bearings

– Gear Drive system on Azimuth-axis• 1 Large Ball Bearing with External Integral Gear• 2 Planetary Reducers• 2 Disc Brakes with space heaters• 2 Brushless Servo Motors including Safety Cut-off Switch

– Actuator Drive system on Elevation-axis•2 Spherical Roller Elevation Bearings•1 Machine Screw Actuator with Anti-backlash Nut•1 Brushless Servo Motor including Safety Cut-off Switch

– Manual Drive Handcrank

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•Pedestal (cont’d)– Direct Drive Encoders

• Inside Tower on Azimuth-axis• Right side (from the rear) Elevation Bearing on Elevation-axis

– Pre & Final Limit Switches• Under Alidade on Azimuth-axis• Left side (from the rear) Elevation Bearing on Elevation-axis

– Azimuth Mechanical Break-Away Switch not needed– RF Inhibit Switch (Disable high power RF uplink whenever antenna elevation angle is 5 degrees or lower– Loop-type Cable Wraps

• Inside Tower on Azimuth-axis• At both Elevation Bearings on Elevation-axis

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•Reflector– Large Center Hub

• 9-foot (2.75m) diameter x 4-foot (1.22m) deep• (4) 11-1/4” (28.575cm) ID cylindrical ports in rolled plate• Large Roll-up Door for Access to R.F. Equipment inside Hub

– Center Hub thermostat controlled Heater/Blower– Space Frame Structure

• 24 Radial Trusses & Braces to support Panels• Quadripod to support Subreflector

– 60 Panels Distributed on 3 Rows

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• Quadripod– 4 elliptical legs design to minimize R.F. blockage– Apex with plates for subreflector mounting

• Subreflector– Fabricated surface accuracy to within .003 inch (0.076mm) RMS– Fine thread mounting studs for ease of alignment

• Access– Large alidade platform with shipboard type stairway to provide access to hub mounted equipment and for mechanical component maintenance– Secondary platform on alidade deck to allow easy access through a rollup door to the hub for equipment maintenance– Access door in tower for mechanical component maintenance

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• Grounding– Jumper Cables

• Across Elevation Bearings• Across Subreflector

– Lightning Rods & Down Conductors• From Top of Reflector Backup Structure• From Top of Quadripod

– Down Conductor• From Alidade to bypass Azimuth Bearing

– Azimuth Wrap Cable Separation• Inside Lower Tower

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13.2M Ka-Band Antenna Structure/MechanicalGeneral Arrangement

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13.2M Ka-Band Antenna Structure/MechanicalAntenna Front View

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13.2M Ka-Band Antenna Structure/MechanicalAntenna Rear View

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13.2M Ka-Band Antenna Feed & Microwave

Designed for Low Sidelobes ITU Recommendation S-580-6

• 29-25 log(q) dBi 1.0o < < 20.0o

• -3.5 dBi 20.0o < < 26.3o

• 32-25 log(q) dBi 26.3o < < 48.0o

• -10 dBi 48.0o < < 180.0o

Designed for Ka-Band Operation Designed for Maximum Gain Designed for Low Noise Temperature

June 2013Page: 23


Ka-Band Feed Performance Summary– Frequency Band

• Receive 17.700 – 20.205 GHz • Transmit 27.000 - 30.000 GHz

– Polarization• Dual Circular (RHCP & LHCP)

– Cross Polarization Isolation• Receive 30.7 dB (27.3 dB 17.700 – 18.200 GHz)• Transmit 30.7 dB

– Port-to-Port Isolation• Tx-Rx 85 dB• Rx-Tx 85 dB• Tx-Tx 20 dB• Rx-Rx 20 dB

– Tx Power 1 KW per Port

June 2013Page: 24


Servo Control & Tracking System

• Antenna Control Unit – 15” (38.1cm)TFT Active Matrix LCD Touch Screen Display

• Digital Tracking Receiver Unit – Ethernet for remote interface– Input tracking frequency: L-Band 950 – 2150 MHz

• Power Drive Unit – Ethernet TCP/IP for M&C

• Portable Maintenance Unit w/LCD Display • PMU J-Box • E-Stop Switches • AZ/EL Transducers• RF Monopulse Scanner Plate • AZ/EL Motor Assembly • AZ Brake Assembly • Drive Isolation Transformer • Regen Resistors• Servo Cables

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Servo Control & Tracking System – Block Diagram

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13.2m Ka-Band IOT Stations - datis-group.com Ka-Band... · © 2012 General Dynamics. All Rights...

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