The Acquisition Process of a Maximun Likelihood GPS Receiver

I.F. Progri, M.C. Bromberg, W.R. Michalson

Abstract:	It is well known that a GPS receiver produces a navigation solution based on (1) the estimation of the time-of-arrival (TOA) between a GPS satellite and itself and (2) decoding the navigation message coming from that satellite. Moreover a GPS receiver must track at least four GPS satellites to solve for its 3D position and local time. Currently most receivers employ a simple sliding correlator to measure the TOA between a GPS satellite transmitting antenna and the receiving antenna. In this paper we propose to use more sophisticated maximum likelihood estimators to greatly improve the performance of the TOA estimation. A maximum likelihood receiver that uses a signal model that considers the joint processing of all satellite waveforms is proposed. The resulting estimator is shown to resolve the near-far problem introduced by the sub-optimal sliding correlator solution.
Published in:	Proceedings of the 16th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS/GNSS 2003) September 9 - 12, 2003 Oregon Convention Center Portland, OR
Pages:	2532 - 2542
Cite this article:	Progri, I.F., Bromberg, M.C., Michalson, W.R., "The Acquisition Process of a Maximun Likelihood GPS Receiver," Proceedings of the 16th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS/GNSS 2003), Portland, OR, September 2003, pp. 2532-2542.
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