Collaborative Tracking of Weak GPS Signals Using an Open-Loop Structure

P. Luo, M.G. Petovello

Abstract:	Weak GPS signal tracking is studied in this paper. To utilize the spatial correlation of the GPS signal among local receivers, a collaborative signal tracking structure is proposed. More specifically, the GPS signal parameter, carrier Doppler from a nearby receiver is provided to the target receiver as reference. An open-loop batch processing technique is used in this study, mainly to take advantage of its high-sensitivity and immediate signal reacquisition. As the major limitation of the open-loop batch processing technique is its heavy computation due to the large uncertainty space in frequency and time domain, the reference signal parameters, that is, carrier Doppler and code phase are provided to limit the search range, and hence to reduce the complexity. In this paper, another benefit of the collaborative open-loop tracking, namely the capability to block a strong interference in a nearby frequency band, is presented, as well.
Published in:	Proceedings of the 2011 International Technical Meeting of The Institute of Navigation January 24 - 26, 2011 Catamaran Resort Hotel San Diego, CA
Pages:	997 - 1006
Cite this article:	Luo, P., Petovello, M.G., "Collaborative Tracking of Weak GPS Signals Using an Open-Loop Structure," Proceedings of the 2011 International Technical Meeting of The Institute of Navigation, San Diego, CA, January 2011, pp. 997-1006.
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