GNSS Signal Channel Impulse Response Estimation: Modified Inverse Filter vs. Wiener Filter

C. Yang, T. Nguyen, M. Miller

Abstract:	Ideally, a GNSS satellite signal channel impulse response is a Dirac delta function (or a series of weighted and delayed delta functions in the presence of multipath signals). It can therefore resolve the timing of both the direct and multipath signals. However, due to the limited bandwidth of the GNSS signal, the transmitter onboard a GNSS satellite, the signal propagation channel, and the receiver front-end, only a round-up pulse is producible in practice. Nevertheless, this pulse is much sharper than the conventional correlation, thus having a better timing accuracy and better robustness in the presence of multipath. This paper presents two methods, namely, the modified inverse filter and the Wiener filter, to estimate a GNSS satellite signal channel impulse response within the framework of GNSS software receivers. Design methods for the filters are presented together with simulation results to show the functionality and performance of the GNSS signal channel impulse response vs. the conventional correlation function for direct path timing estimation in the presence of multipath.
Published in:	Proceedings of the 22nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2009) September 22 - 25, 2009 Savannah International Convention Center Savannah, GA
Pages:	295 - 303
Cite this article:	Yang, C., Nguyen, T., Miller, M., "GNSS Signal Channel Impulse Response Estimation: Modified Inverse Filter vs. Wiener Filter," Proceedings of the 22nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2009), Savannah, GA, September 2009, pp. 295-303.
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