CRADA2 Test Results - UrsaNav · requirement proposed in the 2014 Federal Radionavigation Plan...

EMEA Operations Bertem, Belgium

Corporate Headquarters Chesapeake, VA

Washington DC Metro Area Leesburg, VA

Southeast Region North Charleston, SC ISO 9001

FM 540606

| 1

Leaders in what’s now. Innovators of what’s next.

| 1

URSANAV.COM HARRIS.COM | #HARRISCORP

January 2017

URSANAV, INC. & HARRIS CORPORATION

CRADA2 Test Results





FM 540606

| 2


| 2

April 19, 2016

This work is supported through a Cooperative Research and Development Agreement (CRADA) with the Department of Homeland Security (DHS) Science and Technology

Directorate (S&T) and the U.S. Coast Guard.

This document does not contain critical or sensitive information and there are no risks with the public release of the information.






FM 540606

| 3


| 3

eLoran CRADA Executive Summary

Without differential corrections or augmentations, eLoran results have easily demonstrated the ability to meet the (+/-) one microsecond timing synchronization requirement proposed in the 2014 Federal Radionavigation Plan (FRP)

Without differential corrections or augmentations, eLoran results within a 500 mile range of the test transmitter location have demonstrated (+/-) 500 nanoseconds synchronization to UTC

Without differential corrections or augmentations, 95% of all data collected was within 156 Nanoseconds of UTC


0

20

40

60

80

100

120

5 15 25 35 45 55 65 75 85 95 105 115 125 135 145 155 165 175 185

UTC

Cum

mul

ativ

e Er

ror %

UTC Error (NanoSeconds)

eLoran Vs. UTC Cummulative Error





FM 540606

| 4


| 4

eLoran CRADA Executive Summary

With differential corrections applied at certain locations in the vicinity of a Differential eLoran Reference Station, eLoran demonstrated time synchronization to UTC well within 100 nanoseconds

eLoran was proven in field trials to be a successful backup to GPS timing in a Wide

Area Multilateration (WAM) aviation application, providing equivalent performance to GPS

Additional aviation testing is ongoing, with plans underway to demonstrate precise

time synchronization, Loran Data Channel (LDC) communication, and compass (heading) applications in Unmanned Aerial Vehicles and General Aviation aircraft in January 2017

eLoran in Smart Grid application Proofs-of-Concept are planned for Feb/March 2017






FM 540606

| 5


| 5

Evaluate eLoran as a Wide Area Timing Source

Transmissions from former USCG Loran Support Unit site at Wildwood, NJ 360 KW Effective Radiated Power Two Way Satellite Time Transfer (TWSTT) UTC reference from the US Naval

Observatory

Receivers Bangor, ME (500 Miles) N. Billerica, MA (310 Miles) Columbus, OH (440 Miles) Washington, DC (USNO) (120 Miles) Leesburg, VA (140 Miles) Ocala, FL (790 Miles) [Note: new receiver location.]

Technology Outdoor E-Field antenna Outdoor Loop antenna Loran Data Channel (LDC) demodulation available GPS and/or 5071A Cesium Primary Reference Standard used as comparison

Criteria

Meet one microsecond 2014 FRP timing user requirement






FM 540606

| 6


| 6

eLoran Timing Evaluation Technology Laydown

LSU

• eLoran transmitter at Wildwood, NJ – Synchronized to UTC via

Two Way Satellite Time Transfer (TWSTT) provided by US Naval Observatory

– 360KW of Effective Radiated Power

– Broadcasting dual rated as 8970 Master and Secondary

– LDC broadcast only on 8970 Secondary at raw data rate of 56 bps; effective rate of 21 bps

• Differential eLoran Reference sites at: – North Billerica, MA – Leesburg, VA – Gastonia, NC

(Temporary)

Wildwood, NJ to: (miles) USNO, DC: 120 Leesburg, VA: 140 N. Billerica, MA: 310 Rochester, NY 325 Gastonia, NC 425 Columbus, OH: 440 Bangor, ME: 500 Ocala, FL 790






FM 540606

| 7


| 7

2014 FRP +/- one microsecond as Y-Axis

Period: December 2015 Distance to XMTR: 120 miles

Mean: 22.9 ns STD: 26.1 ns Max: 147.0 ns Min: -90.0 ns

Washington, DC

Wildwood, NJ to Washington, DC (USNO) User Receiver






FM 540606

| 8


| 8

Period: April 2016 Distance to XMTR: 120 miles




Washington, DC






FM 540606

| 9


| 9

Period: July – August 2016 Distance to XMTR: 120 miles

Mean: 25.9 Std : 15.0 Max : 85.0 Min : -38.0



Washington, DC






FM 540606

| 10


| 10


Period: January 2016 Distance to XMTR: 140 miles


Leesburg, VA

Wildwood, NJ to Leesburg, VA User Receiver






FM 540606

| 11


| 11


Mean: -153.0 ns STD: 49.1 ns Max: -31.0 ns Min: -298.0 ns



Leesburg, VA






FM 540606

| 12


| 12

Period July – August 2016 Distance to XMTR: 140 miles

Mean: 33.3 Std : 23.2

Max : 287.0 Min : -25.0



Leesburg, VA






FM 540606

| 13


| 13

Period: October – November 2016 Distance to XMTR: 140 miles

Mean: 79.1 Std : 33.1

Max : 188.0 Min : -29.0



Leesburg, VA






FM 540606

| 14


| 14


Mean: 32.8 Std : 56.8

Max : 228.0 Min : -127.0



Leesburg, VA


Note: An equipment problem at

the Wildwood transmitter

site caused a 500 ns

timing jump relative to UTC. This

500 ns offset was factored

out of the data in this

graph.





FM 540606

| 15


| 15

Wildwood, NJ to North Billerica, MA with and without differential corrections


---North Billerica, MA --- With Differential Corrections


Period: October – November 2016 Distance to XMTR: 310 miles

Without Differential corrections Mean: 134.1 Std : 54.6

Max : 292.0 Min : -12.0

Period: October – November 2016 Distance to XMTR: 310 miles With Differential corrections

Mean: -10.5 Std : 8.1

Max : 38.0 Min : -95.0





FM 540606

| 16


| 16

Wildwood, NJ to North Billerica, MA with and without differential corrections


---North Billerica, MA --- With Differential Corrections




Max : 404.0 Min : 12.0

Period: December 2016 Distance to XMTR: 310 miles With Differential corrections

Mean: -5.1 Std : 9.7

Max : 32.0 Min : -40.0

Note: An equipment problem at

the Wildwood transmitter

site caused a 500 ns

timing jump relative to UTC. This

500 ns offset was factored

out of the data in this

graph.





FM 540606

| 17


| 17




Columbus, OH

Wildwood, NJ to Columbus, OH User Receiver






FM 540606

| 18


| 18


Period: November 2016 Distance to XMTR: 440 miles

Mean: 93.8 Std : 74.1

Max : 361.0 Min : -109.0

Columbus, OH

Wildwood, NJ to Columbus, OH User Receiver






FM 540606

| 19


| 19

Wildwood, NJ to Bangor, ME User Receiver




Bangor, ME






FM 540606

| 20


| 20



Mean: -149.1 ns STD: 69.7 ns Max: 171.0 ns Min: -318.0 ns



Bangor, ME





FM 540606

| 21


| 21


Period: August 2016 Distance to XMTR: 500 miles

Mean: 87.6 Std : 32.9

Max : 191.0 Min : 2.0



Bangor, ME





FM 540606

| 22


| 22



Mean: -9.1 Std : 154.2 Max : 294.0 Min : -361.0



Bangor, ME





FM 540606

| 23


| 23

Wildwood, NJ to Ocala, FL User Receiver


Mean: 93.0 Std : 114.7 Max : 536.0 Min : -448.0



Ocala, FL





FM 540606

| 24


| 24

Evaluate eLoran as a Wide Area Multilateration Timing Source

Transmissions from former USCG Loran Support Unit site at Wildwood, NJ 360 KW Effective Radiated Power Two Way Satellite Time Transfer (TWSTT) UTC reference from the USNO

Receivers Wide Area Multilateration testing – Gastonia, NC (Greater Charlotte area)

Technology Wide Area Multilateration (WAM) using eLoran timing Loran Data Channel (LDC) demodulation available GPS and/or Cesium 5071A PRS used as timing comparison

Criteria

Meet WAM radio timing requirements (± 30 ns @ 95%)






FM 540606

| 25


| 25

Evaluate eLoran as a WAM Timing Source


During normal operations, WAM radio stations use GPS for timing

In the event of a GPS failure: Some WAM radio stations are equipped with high precision external timing

sources (e.g., rubidium clocks, cesium clocks) Other WAM radio stations have no external timing source, but timing errors can

be compensated for by the MLAT Server using an operational “reftran” mode In reftran mode, the MLAT Server uses reference transmissions from

neighboring radio stations and reference timestamps from radio stations with external timing sources to calculate and compensate for timing drift

While use of external timing sources is very effective, high precision atomic clocks

are very expensive

eLoran timing service has been identified as an alternative to using expensive atomic clocks

eLoran receivers are an order of magnitude less costly than cesium clocks





FM 540606

| 26


| 26

Harris currently provides WAM service for Air Traffic Control (ATC) in a subset of ADS-B service volumes using networks of WAM radio stations

Aircraft transmissions are received by a network of radio sites An independent determination of the aircraft position can be achieved through

WAM, given the locations of the radio sites, but relative timing among all radios must be precise (± 30 ns @ 95%) to meet position accuracy requirements

lat1, lon1, tomr1

lat4, lon4, tomr4

lat5, lon5, tomr5

lat6, lon6, tomr6

lat2, lon2, tomr2

lat3, lon3, tomr3

How WAM Works






FM 540606

| 27


| 27

WAM Test Objective and Description


Test Objective Demonstrate that eLoran timing service is sufficient to support WAM radio

station timing requirements

Test Description Harris currently provides WAM service to Air Traffic Control in the Charlotte

(CLT) Terminal area using a network of eleven (11) WAM radio stations Deploy a temporary radio station to the service area equipped with an eLoran

receiver Force the temporary site to use eLoran for timing and assess the usability of the

data to support WAM Services





FM 540606

| 28


| 28

Wildwood, NJ to Gastonia, NC - WAM

Period: November 2016 Distance to XMTR: 425 miles


Max : 283.0 Min : 35.0



---Gastonia, NC --- With Differential

Corrections

Period: November 2016 Distance to XMTR: 425 miles With Differential corrections

Mean: 14.7 Std : 7.5

Max : 64.0 Min : -30.0





FM 540606

| 29


| 29

11/02/2016 Performance (Day 1)

X Pos Acc (68%) Y Pos Acc (68%) X Pos Acc (95%) Y Pos Acc (95%) X Vel Acc (95%) Y Vel Acc (95%) % Prim in MLE

Operational 64.1 ft 52.1 ft 142.3 ft 103.7 ft 3.5 m/s 4.5 m/s 97.80%

Shadow (eLoran) 54.5 ft 45.8 ft 128.2 ft 98.4 ft 3.4 m/s 3.6 m/s 99.23%

Rqmt ≤ 210 ft ≤ 210 ft ≤ 420 ft ≤ 420 ft ≤ 10 m/s ≤ 10 m/s n/a






FM 540606

| 30


| 30











FM 540606

| 31


| 31











FM 540606

| 32


| 32











FM 540606

| 33


| 33

The Proof-of-Concept WAM radio using Differential eLoran as the time reference performed equally as well as the WAM radios using GPS as the time reference

The Proof-of-Concept WAM radio Using Differential eLoran did not cause the

system to alarm, nor were any thresholds exceeded The MLAT Server produced accurate position solutions with eLoran more than 96

hours after loss of GPS

WAM Proof-of-Concept Conclusions






FM 540606

| 34


| 34

Evaluate eLoran as an Aircraft Time and Data Source

Transmissions from former USCG Loran Support Unit site at Wildwood, NJ 360 KW Effective Radiated Power Two Way Satellite Time Transfer (TWSTT) UTC reference from the US Naval

Observatory

Receivers General Aviation Testing - Rochester, NY Unmanned Aerial Vehicle Testing – New Gretna, NJ

Technology Loran Data Channel (LDC) demodulation available GPS and/or Cesium 5071A PRS used as timing comparison

Criteria

Proof-of-Concept: Determine if eLoran might be suitable in General Aviation Aircraft and Unmanned Aerial Vehicles as a precise time source, one-way data communication source, and to provide compass (heading) information






FM 540606

| 35


| 35

Wildwood, NJ to Rochester, NY – Aviation Test


12/13/2016: Wheels up by

11:10am, Wheels down by

12:40pm.

Both receivers (E-field and H-field) received the eLoran signal throughout the flight test

Data analysis to characterize performance is ongoing

Additional UAV

testing is planned in January





FM 540606

| 36


| 36

eLoran is a stable, wide area source of PNT for redundancy and resiliency in multiple applications.

eLoran works in many locations where GPS is not available. eLoran works when GPS may be untrustworthy.

Without differential corrections, eLoran is capable of meeting 2014 FRP timing user requirements of +/- 1 microsecond over very wide areas.

With the application of differential corrections, eLoran is capable of providing better than +/- 100 nanoseconds timing accuracy to users of over a local area.

Contact Us for Collaborative Efforts!

UrsaNav, Inc. 85 Rangeway Road Building 3, Suite 110

North Billerica, MA 01862

+1.781.538.5299 www.ursanav.com

Contact Us for Collaborative Efforts!

Harris Corporation Critical Networks

2235 Monroe Street Herndon, VA 20171

+1.703-245-4292 www.harris.com

Summary


http://www.ursanav.com/

http://www.harris.com/

CRADA2 Test Results - UrsaNav · requirement proposed in the 2014 Federal Radionavigation Plan...

Documents

Transcript of CRADA2 Test Results - UrsaNav · requirement proposed in the 2014 Federal Radionavigation Plan...