A Non-Coherent Block Processing Architecture for Standalone GNSS Weak Signal Tracking

Shashank Satyanarayana, Daniele Borio, Gerard Lachapelle

Abstract:	In this paper, a new class of enhanced acquisition and tracking techniques for GPS weak signal is proposed for standalone receivers. A new detection scheme for weak signal acquisition in the presence of data bits is derived from the Generalized Likelihood Ratio Test (GLRT) and its performance is evaluated against that of existing techniques using simulations. A new architecture for tracking GPS weak signals is also proposed. The technique uses squaring to remove data bit transitions and block processing to allow long integrations and solve for loop stability problems. Performance of the proposed tracking scheme is evaluated using both software and hardware simulations. The effectiveness of the proposed algorithm is also shown by tracking GPS weak signals in several indoor environments under dynamic conditions, where the signal power levels falls below 10 dB-Hz on several occasions. It is shown that the proposed tracking technique is able to quickly recover from deep power fades and provide accurate Doppler estimates in signal degraded environments.
Published in:	Proceedings of the 24th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2011) September 20 - 23, 2011 Oregon Convention Center, Portland, Oregon Portland, OR
Pages:	1777 - 1785
Cite this article:	Satyanarayana, Shashank, Borio, Daniele, Lachapelle, Gerard, "A Non-Coherent Block Processing Architecture for Standalone GNSS Weak Signal Tracking," Proceedings of the 24th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2011), Portland, OR, September 2011, pp. 1777-1785.
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