A Multiple Filter Approach for Precise Kinematic DGPS Positioning and Carrier-Phase Ambiguity Resolution

PAUL E. HENDERSON, JOHN F. RAQUET, and PETER S. MAYBECK

Peer Reviewed

Abstract:	The most precise relative positioning obtained using differential GPS depends on an accurate determination of carrier-phase integer ambiguities. To achieve high precision, many current static and kinematic surveying algorithms use a floating-point solution until enough information becomes available to fix the carrier-phase ambiguities accurately. A new method for kinematic carrier-phase ambiguity resolution, based upon a multiple-model adaptive Kalman filter, is presented in this paper. This method starts with the floating-point results, yet attains the precision of the correct fixed-integer solution smoothly and rapidly, eliminating the need to decide when to switch from the floating to the fixed-integer solution. This method is based on a blending of solutions from multiple filters, each of which hypothesizes a different ambiguity set.The new method was evaluated during ground and flight tests. Initial results indicate that the method is capable of quickly resolving carrier-phase ambiguities and smoothly transitioning to a highly accurate (centimeter-level) navigation solution.
Published in:	NAVIGATION: Journal of the Institute of Navigation, Volume 49, Number 3
Pages:	149 - 160
Cite this article:	HENDERSON, PAUL E., RAQUET, JOHN F., MAYBECK, PETER S., "A Multiple Filter Approach for Precise Kinematic DGPS Positioning and Carrier-Phase Ambiguity Resolution", NAVIGATION: Journal of The Institute of Navigation, Vol. 49, No. 3, Fall 2002, pp. 149-160.
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