Integrating Hand-Held SAASM GPS Receivers with Legacy Shipboard Navigation and Weapons Systems

Richard Webb and William R. Woodward

Abstract:	A Hand-held Global Positioning System (GPS) receiver such as the Defense Advanced GPS Receiver (DAGR) features a 12-channel GPS signal processor and a Selective Availability Anti-Spoofing Module (SAASM). This hardware combination provides outstanding GPS performance. It also offers extended performance in a diverse jamming environment. Legacy shipboard navigation and weapons systems typically receive GPS data via the Naval Tactical Data System (NTDS) interface. Unfortunately an NTDS interface is not practical for any hand-held piece of equipment. The DAGR however, does feature full duplex NMEA 0183 and ICD-GPS-1533 serial interfaces. In addition it also offers 1 PPS, 10 PPS, and HAVEQUICK interfaces. An interface system that could utilize the DAGR’s interfaces and additional shipboard interfaces such as a gyrocompass or inertial navigation system and speed log could potentially replace the AN/WRN-6 GPS receiver. This system would not only interface with legacy navigation and weapons systems as the AN/WRN- 6 currently does; it would provide these systems with the latest SAASM GPS capabilities. These capabilities could be complimented with the addition of a second DAGR; providing redundancy and an ability to select the best performing receiver. Technology upgrades would only require swapping out or upgrading the hand-held unit. Ursa Navigation Solutions is developing this system based on their current production Ursa Navigator™. The enhanced Navigator™ will work across all platforms currently using the AN/WRN-6. It will provide redundant state-of-the-art SAASM GPS performance to shipboard navigation and weapons systems.
Published in:	Proceedings of the 2008 National Technical Meeting of The Institute of Navigation January 28 - 30, 2008 The Catamaran Resort Hotel San Diego, CA
Pages:	969 - 972
Cite this article:	Webb, Richard, Woodward, William R., "Integrating Hand-Held SAASM GPS Receivers with Legacy Shipboard Navigation and Weapons Systems," Proceedings of the 2008 National Technical Meeting of The Institute of Navigation, San Diego, CA, January 2008, pp. 969-972.
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