Comparison of GPS and GPS+GLONASS Positioning Performance

T. Hall, B. Burke, M. Pratt, and P. Misra

Abstract:	The incremental benefits of the GLONASS signals are analyzed for the civil users of GPS. Specik311y, the pesiticming perfcmnance of GPS is cunpared with that of GPS+GLONASS for single-receiver and difkrential mode using code, carrier-smoothed code, and carrier phase meammmen ts at L1. In singlemxeiver mode, the posit.h estimates obtaind with GPS+GLONASS are signitkantly better than those fran GPS, due entirely to the feature of Selective Availability (SA) in GPS. In difkrential mode, the ellkct of SA in GPS is substantially neutralized and the measurements fklm the two systems can be treated as equals. The frequency divemity of the GLONASS signals, however, introduces calibration problems in receiver design in the fmu ef signal path delays or inter-channel biases. These biases, if not calibrated mt or accounted fw, can beaamucecf significant errca in difkrential mode, and may result in net loss of accuracy. With properly calibrated GLONASS carrier phase measurements, however, the integer amb@ty resolution is greatly facilitated the float solutions canverge faster and singleqech solutions appear feasible for short baselines (< 10 km).
Published in:	Proceedings of the 10th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1997) September 16 - 19, 1997 Kansas City, MO
Pages:	1543 - 1550
Cite this article:	Hall, T., Burke, B., Pratt, M., Misra, P., "Comparison of GPS and GPS+GLONASS Positioning Performance," Proceedings of the 10th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1997), Kansas City, MO, September 1997, pp. 1543-1550.
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