Heading and Pitch Determination using GPS/GLONASS with a Common Clock

JiunHan Keong and Gérard Lachapelle

Abstract:	This paper describes an approach to GPS GLONASS to estimate heading and pitch using a twin GPS/GLONASS receiver system. The theory behind the use of GPS for attitude component determination is well known. Augmentation of GPS with GLONASS is not straightforward however because the latter system employs the technique of frequency division multiple access (FDMA) to distinguish the signals from different satellites, rather than the code division multiple access (CDMA) technique used by GPS, The fact that each GLONASS signal has its own slightly different frequency makes the double difference (DD) of carrier phase observable no longer possible without modification. To get around this problem, the use of between-receiver single difference (SD) of the carrier phase observable is proposed. In this case however, receiver clock and other errors do not cancel out. This paper analyses (he possibility of using an external frequency and time standmd as a common external oscillator for the two receivers. Remaining time and other biases are estimated using a low pass average filter. The single difference ambiguities can then be resolved and the heading and pitch can be determined with an accuracy similar to that of GPS under benign visibility conditions, Under reduced visibility, the combined GPS/GLONASS approach is shown to yield superior availability. The results of selected static and kinematic tests conducted with a pair of GPS/GLONASS receivers are described to valichte this approach.
Published in:	Proceedings of the 11th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1998) September 15 - 18, 1998 Nashville, TN
Pages:	2053 - 2061
Cite this article:	Keong, JiunHan, Lachapelle, Gérard, "Heading and Pitch Determination using GPS/GLONASS with a Common Clock," Proceedings of the 11th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1998), Nashville, TN, September 1998, pp. 2053-2061.
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