Software-based GNSS L1 Interferometric Positioning

Benoit J. Muth

Abstract:	Interferometric positioning has been achieved with analog hardware processing GPS signals. We present the implementation and results of a software-based interferometric positioning experiment for measuring the baseline vector between two locations using GNSS signals. Two identical software receivers, each consisting of an antenna, a front-end collecting signals in the L1 band and a laptop, are placed at both ends of the baseline. Cross-correlating the raw data streams in post-processing yields the time difference of arrivals of the signals at the receivers. The three dimensional baseline vector is computed after applying several corrections to the measurements. Issues that are inherent to producing differenced observables, such as the correlation of two noisy signals and the detection of all satellites in the integrated correlation are adressed in this paper. Issues arising from features of the hardware front-ends such as the synchronisation of the two receivers and the limited sampling frequency are also adressed by means of basic interpolations of the raw time difference of arrivals measurements.
Published in:	Proceedings of the 21st International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2008) September 16 - 19, 2008 Savannah International Convention Center Savannah, GA
Pages:	3009 - 3019
Cite this article:	Muth, Benoit J., "Software-based GNSS L1 Interferometric Positioning," Proceedings of the 21st International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2008), Savannah, GA, September 2008, pp. 3009-3019.
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