Gravity Modeling for High-Accuracy GPS/INS Integration

Dorota A. Grejner-Brzezinska and Jin Wang

Abstract:	The feasibility of improving airborne GPS/INS integrated navigation by use of accurate deflection of the vertical (DOV) information is investigated. Based on the available 2’´2’ DOV grid, tests were run on GPS/INS navigation data, and compared with the corresponding results where the DOV compensation was not used. The issue of stochastic modeling of the anomalous gravity field in the state vector of the integrated filter is also addressed here. The tests were conducted using the Airborne Integrated Mapping System (AIMSÔ), whose positioning component is based on a tightly integrated GPS/INS. The system is designed to provide orientation and position of an aerial platform, with estimated accuracy of 4-7 centimeters in position, and less than 10 arcsec in orientation. A brief overview of the system is also given, including a discussion of current error modeling and airborne test results.
Published in:	Proceedings of the 54th Annual Meeting of The Institute of Navigation (1998) June 1 - 3, 1998 The Adams Mark Hotel Denver, CO
Pages:	425 - 434
Cite this article:	Updated citation: Published in NAVIGATION: Journal of the Institute of Navigation
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