The AN/ASN-12SB, an Integrated Doppler/GPS Navigation System

Heinz Buell

Abstract:	GPS receivers have been successmlly embedded in Doppler Radar dead-reckoning navigation systems. These integrated systems provide signiticant performance advantages over each sensor operating by itself, including continuously available navigation and guidance information, operation in areas of high GPS j amming and automatic initialization and continuous updating of Doppler position. Automatic integration of data from the two sensors relieves an already overloaded pilot from having to perform this critical task. The U.S. Army has tunded GEC-Marconi Electronic Systems Corporation to embed a single-card P(Y) code GPS receiver into its ANIASN-128 Lightweight Doppler Navigation System (LDNS). The new system has been given the nomenclature of AN/ASN- 128B. Three systems have been built and have been extensively tested inchrding bench, environmental and flight tests. A multi-year production contract was awarded to GEC-Marconi Systems in August 1995 to build 1693 systems, with deliveries starting in April, 1996. This paper discusses the advantages of the integrated AN/ASN- 128B, including its ease of installation into helicopters that already have the AN/ASN- 128, itsperformsnce, operation in the National Air Space, a nonprecision tactical approach capability and a MIL-STD- 1553 interface to support integration with other avionics in future bused aircraft. The integration or combining of GPS and Doppler position and velocity data will be described. A brief review of the system and GPS card test results will be presented. Finally, a brief review of potential areas of growth will be given.
Published in:	Proceedings of the 1996 National Technical Meeting of The Institute of Navigation January 22 - 24, 1996 Loews Santa Monica Hotel Santa Monica, CA
Pages:	249 - 258
Cite this article:	Buell, Heinz, "The AN/ASN-12SB, an Integrated Doppler/GPS Navigation System," Proceedings of the 1996 National Technical Meeting of The Institute of Navigation, Santa Monica, CA, January 1996, pp. 249-258.
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