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A joint NASA-Langley/Honeywell flight test project evaluating a differential Global Positioning System (GPS)Ilnertial Navigation System (INS) as an approach/landing aid was completed in November 1990. The test objective was to acquire a system performance data base and to demonstrate automatic landing using an integrated differential GPS/INS with radar altimeter aiding for vertical axis guidance. A NASA Boeing 737 testbed was used to evaluate the differential GPSIINS performance which included real-time comparison against MLS-derived position. This paper presents an overview and summary of the results from that flight test and discusses the application and benefits of the integrated INS/GPS to future space vehicles.

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