Integrating Evolving Military GPS Receiver Technology and Enhanced LORAN with New and Legacy Shipboard Systems

W.R. Woodward, R. Webb

Abstract:	Military GPS receiver technology is rapidly advancing. However, no GPS system is immune to interference, jamming, or spoofing. New and legacy shipboard systems need a Position, Navigation, and Timing (PNT) system that receives and analyzes information from multiple navigation and timing sensors including enhanced LORAN (eLORAN). This PNT system needs to interface with legacy and new shipboard systems and must be capable of detecting unexpected variations in sensor data and alert the operator when these conditions exist. A PNT gateway that could back-fit legacy systems as well as forward fit new platforms would allow for the rapid integration of currently available SAASM GPS receivers and future M-Code and eLORAN receivers. This system would replace the AN/WRN-6(V) on more than 230 U.S. Navy, U.S. Coast Guard, and Military Sealift Command (MSC) platforms. It would also replace the AN/WRN- 7(V) that is used by foreign military allies on approximately 250 ships. The gateway would interface with the Navigation Sensor System Interface (NAVSSI) suite, the primary source for PNT information on major combatants, including 122 U.S. Navy surface platforms and several allied Aegis platforms. The rapid, low cost insertion of advanced GPS receiver technology and developing eLORAN technology into U.S. Navy and foreign military ally ships requires a PNT gateway that can interface with current and future receivers, and existing and future navigation and weapon systems. To allow maximum flexibly and the ability to leverage from GPS and eLORAN receiver technology used by all branches of the armed forces, the PNT gateway must accept multiple form factor internal and external receivers. With multiple PNT sensors and the ability to obtain navigation data from the ship’s inertial navigation system the PNT gateway will be able to monitor real time differences in each sensors data. Differences in the data may indicate a failed sensor or possible interference, jamming, or spoofing. When an operator selected margin of error is exceeded the PNT gateway would alert the operator and provide detailed information about the discrepancy.
Published in:	Proceedings of the 22nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2009) September 22 - 25, 2009 Savannah International Convention Center Savannah, GA
Pages:	134 - 139
Cite this article:	Woodward, W.R., Webb, R., "Integrating Evolving Military GPS Receiver Technology and Enhanced LORAN with New and Legacy Shipboard Systems," Proceedings of the 22nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2009), Savannah, GA, September 2009, pp. 134-139.
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