EPOCH-BY-EPOCH AMBIGUITY RESOLUTION FOR REAL-TIME ATTITUDE DETERMINATION USING A GPS MULTI-ANTENNA SYSTEM

Ahmed El-Mowafy and K. P. Schwarz

Peer Reviewed

Abstract: To determine the attitude of a moving vehicle in real time, GPS phase ambiguities should be instantaneously resolved. This paper presents an efficient technique for resolving phase ambiguities from data of one epoch, within the time interval between successive outputs. The technique employs a specific antenna configuration to limit significantly the range within which the integer ambiguities must be searched. The paper also investigates factors that can enhance the speed and robustness of ambiguity resolution. A number of static and kinematic tests have been conducted to evaluate the potential of the technique. Using a 486 DX computer with a 50 MHz clock rate, the success rate for finding the correct ambiguities from data of one epoch exceeds 99 percent. The computation time required is about 0.5 s. Results also show that the performance of the technique is the same for the static and kinematic modes.
Published in: NAVIGATION, Journal of the Institute of Navigation, Volume 42, Number 2
Pages: 391 - 408
Cite this article: El-Mowafy, Ahmed, Schwarz, K. P., "EPOCH-BY-EPOCH AMBIGUITY RESOLUTION FOR REAL-TIME ATTITUDE DETERMINATION USING A GPS MULTI-ANTENNA SYSTEM", NAVIGATION, Journal of The Institute of Navigation, Vol. 42, No. 2, Summer 1995, pp. 391-408.
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