Status of GPS/Loran Prototype for FAA Trials by James H. Doty and Patrick Y. Hwang, Ph.D., Rockwell Collins, Inc., Linn Roth, Ph.D., Locus, Inc., and Mitchell J. Narins, Federal Aviation Administration, - PowerPoint PPT Presentation

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PPT – Status of GPS/Loran Prototype for FAA Trials by James H. Doty and Patrick Y. Hwang, Ph.D., Rockwell Collins, Inc., Linn Roth, Ph.D., Locus, Inc., and Mitchell J. Narins, Federal Aviation Administration, PowerPoint presentation | free to download - id: 21a9a2-ZDc1Z



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Status of GPS/Loran Prototype for FAA Trials by James H. Doty and Patrick Y. Hwang, Ph.D., Rockwell Collins, Inc., Linn Roth, Ph.D., Locus, Inc., and Mitchell J. Narins, Federal Aviation Administration,

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James H. Doty and Patrick Y. Hwang, Ph.D., Rockwell Collins, Inc., Linn Roth, Ph.D., Locus, Inc. ... Portions of this work are being performed under subcontract ... – PowerPoint PPT presentation

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Title: Status of GPS/Loran Prototype for FAA Trials by James H. Doty and Patrick Y. Hwang, Ph.D., Rockwell Collins, Inc., Linn Roth, Ph.D., Locus, Inc., and Mitchell J. Narins, Federal Aviation Administration,


1
Status of GPS/Loran Prototype for FAA Trialsby
James H. Doty and Patrick Y. Hwang, Ph.D.,
Rockwell Collins, Inc., Linn Roth, Ph.D.,
Locus, Inc., and Mitchell J. Narins, Federal
Aviation Administration,
  • Portions of this work are being performed under
    subcontract SK-00-18 between Locus, Inc. and
    Advanced Management Technology, Inc. (AMTI) and
    under subcontract SK-02-02-001-00 between
    Rockwell Collins, Inc. and AMTI under a Federal
    Aviation Administration (FAA) Broad Information
    Technology Services (BITS) contract.

2
Outline
  • Interest in Loran
  • GPS/Loran Integration Program
  • Program Status
  • Breadboard System design and test results
  • Brassboard System features

3
Resurgence In Loran Interest
  • DOTs Volpe Center study on GPS vulnerabilities
    spurred interest in independent, backup systems
    for both navigation and timing, i.e. critical
    infrastructure areas
  • USCG interest in harbor entrance and approach
  • FAA interest for NPA (Non-Precision Approach)
  • Since 1997, Congress has provided 69M to further
    Loran development, and estimate 21-25M in 2003
  • Loran infrastructure upgrade well underway, and
    overall system performance will improve when
    upgrade complete

4
GPS/Loran Integration Program
  • The FAA is funding efforts to develop resources
    to evaluate and demonstrate the use of Loran to
    enhance the integrity and continuity of airborne
    navigation systems
  • Rockwell Collins and Locus are under subcontracts
    to Advanced Management Technology, Inc. (AMTI)
  • Locus is leading the effort to develop a
    prototype combined GPS Loran H-field antenna
    and a standalone Loran receiver
  • Rockwell Collins is leading the Integration of a
    Locus Loran receiver into a Collins Multimode
    Radio (MMR)

5
GPS/Loran Integration Program
Locus
Loran Receiver
Standard SatMate 1020Loran Receiver
H-Field Loran Antenna
Loran Card
GPS/Loran Antenna Development
GPS/Loran Antenna
GPS/Loran Integration Effort
GPS Antenna Requirements
Brassboard GPS/Loran
Loran CardICD
StandardGNLU-930MMR
GLIP Card
BreadboardGLIP
Rockwell Collins
Breadboard GPS/Loran
6

Program Responsibilities
Locus
Rockwell Collins
  • Develop Eurocard size SatMate 1030
  • Develop combined GPS/Loran H-field antenna
  • Support Rockwell MMR integration
  • Deliver prototype systems to FAA and Rockwell and
    support FAA tests
  • Program efforts began January 2002
  • Develop interface definition for embedded Loran
    card
  • Perform integrity analysis and develop
    integration algorithms
  • Integrate Locus Loran receiver into Multimode
    Receiver (MMR)
  • Support Locus antenna integration
  • Deliver prototype system and support FAA tests
  • Program efforts began May 2002

7

Locus Program Status
Combined GPS/Loran prototype antenna functioning
Uses certified ADF radome for flight tests
Eurocard SatMate 1030 prototype receiver
functioning
8

Locus Program Status
Eurocard SatMate 1030 in stand-alone enclosure
Front Panel
Rear Panel
9

Rockwell Collins Program Status
GLIP integration processor card for Brassboard
System assembled and tested
Breadboard GPS/Loran system completed and van
tested
10
Current Rockwell Collins MMR
MMR - GNLU-930
VHF
Loc
/GBAS
ILS loc/glide
UHF
Glideslope
Localizer/ Glideslope deviations
L-band
GPS PVT
GLS PAN
MLS az/el
C-band
Other GPS users (e.g. FMS, EGPWS)
  • Current GNLU-930 MMR provides Localizer/Glideslop
    e deviation information for approach, and PVT
    (position, velocity, time) information for area
    navigation and other uses

11
Brassboard MMR Architecture
MMR - GNLU-930
VHF
Loc
/GBAS
ILS loc/glide
UHF
Glideslope
Localizer/ Glideslope deviations
L-band
GLS PAN
GPS PVT
Loran
LF
Integration Proc.
Other GPS users (e.g. FMS, EGPWS)
  • Locus SatMate 1030 Loran card will be embedded
    into Rockwell Collins MMR
  • An independent GPS/Loran Integration Processor
    (GLIP) card will be added to minimize development
    risk

12
New GPS Loran Integration Processor (GLIP)
Functions
  • To facilitate flight test evaluation of
    alternative Loran utilization techniques,
    multiple solutions of position and integrity
    limits are generated and output
  • GPS-only passes through GNSS solution
  • Loran-only recomputes position solution from
    Loran measurements
  • Federated GPS-Loran processes Loran and GPS
    measurements but maintains independence between
    sensors for improved integrity
  • Integrated GPS-Loran calibrates Loran errors
    using GPS and produces a more accurate position
    solution

13
Breadboard GPS/Loran System
  • Takes data from unmodified GNLU-930 MMR and
    SatMate 1020 Loran Receiver
  • Recreates Loran Position solution from Loran
    timing measurements
  • Produces an integrated GPS-aided Loran Solution
  • Solutions available on both ARINC 429 and RS232
    output formats

14
Breadboard Pallet I/O
Antenna Connections
Loran H-field Antenna
GPS Antenna
Output Data
Input power
ARINC 1 GPS only
110V AC 60 Hz
ARINC 2 Loran only
GPS/Loran Breadboard
28V DC
ARINC 3 GPS/Loran
RS232 Combined data for collection
  • The Breadboard GPS/Loran (GPS-aided Loran)
    solution is a Loran solution corrected with ASFs
    calibrated using GPS PVT data
  • RS232 output includes ASF correction data, all
    three position solutions, and raw Loran Data
    messages

15
Breadboard Loran-Only Position Solution
NoWeighting
With more stations the weighting algorithm has a
significant impact on estimated position
With only three stations weighting does not
change position solution
Revised weighting algorithm overlays Locus
solution
Original CollinsWeighting
  • Extensive work was required to reproduce the
    Locus position solution from the delta-time
    measurements
  • Locus provided implementation details of the
    Locus weighting algorithm
  • Position solution differences consistently well
    under 10 meters

16
Breadboard Van Testing
  • The Breadboard GPS/Loran system was tested in
    the Collins Mobile Navigation Lab Van
  • The antenna mount was raised to reduce
    interference from other van systems

17
Breadboard Van Test Results
The GPS-aided Loran solution is corrected for
position bias errors, but has noise
characteristics matching the Loran-only solution
GPS-Aided Loran
GPS
GLIP Loran-only
100m
Locus Loran Solution
100m
18
Highway Breadboard Van Testing
Turn
1 km
1 km
Passed under power lines
End
GPS-aided Loran solution tracked GPS position
well except for a brief anomaly when the van
passed under high-voltage power lines
Start
19
Typical Van Test Results
Van test solution errors relative to GPS in meters
Average North Pos. Offset Average East Pos. Offset North Position Noise East Position Noise
Locus receiver solution (no ASF corrections) -164.3 -195.6 20.9 26.6
GLIP Loran-only solution (no ASF corrections) -164.0 -196.4 20.9 26.8
GPS-Aided solution -2.0 -1.4 18.8 24.3
GPS-derived ASF corrections dramatically reduce
position error in GPS-aided solution
ASF corrections do not significantly reduce noise
GPS-aiding Loran corrects slowly-varying ASF
errors of Loran but a more tightly integrated
solution is required to reduce noise
20
Brassboard System Features
  • The brassboard system will integrate the
    Breadboard system functionality into the standard
    GNLU-930 MMR form factor
  • Brassboard will include Locus SatMate 1030
    prototype card and Collins GLIP card
  • The integrated solution will be more tightly
    coupled to GPS to improve noise when GPS is
    available
  • A new Federated GPS/Loran solution will be added
    for improved integrity monitoring
  • All outputs will ARINC 429 and RS-232 monitor
    port will be eliminated

21
Brassboard MMR System
  • Locus Loran card will be installed in place of
    the MLS slice on door of a modified GNLU-930

22
MMR Added Cards
  • The new Collins GPS Loran Integration Processor
    (GLIP) card will be installed in the center card
    cluster in place of the FMS slice
  • A ribbon cable from the GLIP to the Loran card
    will provide power and data communications

23
MMR Card Modifications
RearInterconnect Card
System Processor
Power Supply
ILS Card
  • The ILS and other MMR cards will remain
    unmodified (except for minor additions to the
    rear interconnect card)

24
Summary
  • The FAA is supporting efforts to evaluate Loran
    for suitability of use in NPA and other airborne
    navigation applications
  • Rockwell Collins and Locus are participating in
    coordinated programs to develop demonstration
    prototype GPS/Loran antenna and GPS/Loran MMR
  • Will be utilized by FAA to evaluate and
    demonstrate the use of Loran to enhance integrity
    and continuity
  • The Breadboard GPS/Loran system has been
    completed and van tested
  • The Breadboard system is working well and
    performance characteristics are about as expected
  • Components for both the Brassboard System and
    GPS/Loran Antenna have been assembled and are
    being tested
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