GPS Geodesy: Real-Time Processing Possibilities With the Kalman Filter Approach

Patrick Y. C. Hwang, R. Grover Brown

Abstract:	The Kalman filter approach to precise positioning using GPS was first introduced three years ago by the authors. Via computer simulations, it was demonstrated that the wavelength ambiguity associated with GPS carrier phase data could be resolved with much shorter observation time spans than had previously been reported. A major advantage of this method lies in its ability to process data sequentially owing to the recursive nature of the Kalman filter, thus lending itself well to real-time or "near real-time" (prompt off-line) applications. In addition, only a modest observation time span is needed to solve for the initial wavelength ambiguity. Results using this technique to process actual GPS phase data have shown that accuracies of the order of one part in 200,000 are readily obtainable using a satellite observation time span of only 20 to 30 minutes.
Published in:	Proceedings of the 1987 National Technical Meeting of The Institute of Navigation January 20 - 23, 1987 Anaheim, CA
Pages:	164 - 167
Cite this article:	Hwang, Patrick Y. C., Brown, R. Grover, "GPS Geodesy: Real-Time Processing Possibilities With the Kalman Filter Approach," Proceedings of the 1987 National Technical Meeting of The Institute of Navigation, Anaheim, CA, January 1987, pp. 164-167.
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