The Game Plan for Loran-C Modernization John J. Macaluso U. S. Coast Guard Mitchell J. Narins U. S....
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The Game Plan for Loran-C Modernization John J. Macaluso U. S. Coast Guard Mitchell J. Narins U. S. Federal Aviation Administration International Loran Association Boulder, Colorado November 4, 2003
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Transcript of The Game Plan for Loran-C Modernization John J. Macaluso U. S. Coast Guard Mitchell J. Narins U. S....
The Game Plan for Loran-C Modernization
John J. MacalusoU. S. Coast Guard
Mitchell J. NarinsU. S. Federal Aviation Administration
International Loran AssociationBoulder, Colorado
November 4, 2003
Introduction
• Purpose of Loran-C Modernization
• Overall Enhanced-Loran Context
• Loran Recapitalization Project– Status– Plans (Order of Lorsta Conversion)– Modernized Coverage in 2004
Purpose of Loran-C Modernization
• GPS and GPS augmentation services
• Volpe Vulnerability Study, 1998-2001– Timing, multimodal transportation– Intentional and unintentional interference– Consequences of loss of GPS– Mitigation strategies & technologies
• Loran-C has potential as GPS back-up
Potential of Loran-C
• Loran-C and GPS are complementary
• Both provide timing, positioning & nav info
• GPS is worldwide
• Loran-C operates where concerns are greatest
• Different strengths & weaknesses
• Loran-C requires modernization
“Enhanced Loran”
• Antenna technology• Blink• Communications using the Loran signal• Differential Loran• Early skywave & other integrity issues• Time-of-Transmission Control• Calibration of Loran System• Loran Recapitalization Project
Loran Recapitalization Project
• 24 Coast Guard-operated Lorstas• CONUS & Alaska Lorstas operating
– Vacuum-tube transmitters (TTX)– Solid State transmitters (Legacy-SSX)– Control & Monitoring System (LCCS)
• New Equipment– Solid State Transmitter (NSSX)– Timing & Frequency Equipment (TFE)– Control & Monitoring Equipment (NLCCS)
Paths to Modernization
• Legacy-SSX Lorsta Conversion (13 each)– Install new TFE & integrate with Legacy SSX
• Vacuum-tube Lorsta Conversion (11 each)– Construct new transmitter building– Build/install new transmitter (NSSX)– Install new TFE
• Control Station (2 each)– Install new LCCS at Navcen East & West
First Modernized Lorsta
• Lorsta George, WA– Vacuum-tube transmitter– Converted to NSSX on 23 Oct 2003– Casualty - reverted to TTX on 29 Oct 2003– Troubleshooting currently underway
• Signal can be monitored by NIST, TSC
• Involves Canadian government early
Expected Coverage of Lorsta George
-0.5
0
0.5
1
1.5
-130 -120 -110 -100 -90 -80 -70 -6025
30
35
40
45
50
55
60Number of stations above 45 dB re 1uv/m
+ George
Coverage Adding Dana, Seneca, Baudette
-0.5
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
-130 -120 -110 -100 -90 -80 -70 -6025
30
35
40
45
50
55
60Number of stations above 45 dB re 1uv/m
+ George + Baudette
+ Dana
+ Seneca
Coverage Adding Malone & Boise City
0
1
2
3
4
5
6
-130 -120 -110 -100 -90 -80 -70 -6025
30
35
40
45
50
55
60Number of stations above 45 dB re 1uv/m
+ George + Baudette
+ Dana
+ Seneca
+ Malone
+ Boise City
Chain-by-Chain Conversion
• Great Lakes Chain (GLKS)• US West Coast Chain (USWC)• Northeast US Chain (NEUS)• Southeast US Chain (SEUS)• South Central US Chain (SOCUS)• North Central US Chain (NOCUS)• Gulf of Alaska Chain (GOA)• North Pacific Chain (NORPAC)
Conclusion
• Lorsta George – First converted Lorsta
• GLKS – First converted Loran chain
• Chain-by-chain conversion– CONUS Lorstas– Alaskan Lorstas
• Several other “Enhanced Loran” initiatives
• Loran-C positioned to serve the nation
Questions
John J. MacalusoUSCG Loran Support Unit
(609)523-7248
Mitchell J. NarinsU. S. Federal Aviation Administration
(202)493-4336
