An Enhanced Acquisition Process of a Maximum Likelihood GPS Receiver

Ilir F. Progri, Matthew C. Bromberg, and William R. Michalson

Abstract:	Recently we proposed an acquisition process of a maximum likelihood Global Positioning System (GPS) receiver that considers the joint processing of all GPS satellite waveforms. The resulting estimator was shown to elegantly resolve the near-far problem introduced by the sub-optimal sliding correlator solution. However, the proposed acquisition model included only the code search, which estimates only the time of arrival (TOA) between a GPS satellite and a maximum likelihood GPS receiver. In this paper we propose to enhance the acquisition process by including the estimation of Doppler along with the estimation of the TOA, which results in a twodimensional Doppler and code search. An assessment based on the theoretical performance and simulation results of the improved acquisition process of a maximum likelihood GPS receiver is included in the paper. Moreover, a maximum likelihood GPS receiver can achieve an order of magnitude performance improvement against a traditional sliding correlator.
Published in:	Proceedings of the 2004 National Technical Meeting of The Institute of Navigation January 26 - 28, 2004 The Catamaran Resort Hotel San Diego, CA
Pages:	390 - 398
Cite this article:	Progri, Ilir F., Bromberg, Matthew C., Michalson, William R., "An Enhanced Acquisition Process of a Maximum Likelihood GPS Receiver," Proceedings of the 2004 National Technical Meeting of The Institute of Navigation, San Diego, CA, January 2004, pp. 390-398.
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