Abstract
Accurate tracking of the GPS signal in a base band correlator is critical for the positioning accuracy. However, the performance of the received signal is degraded by the presence of a multipath signal. This paper proposes the tracking of the GPS signal in the presence of the multipath using a RAKE receiver with multiple fingers. Each finger in the RAKE receiver is modelled to track the direct and respective multipath signals using the Least Mean Square (LMS) algorithm. The LMS algorithm provides an estimate of the multipath signal, and the RAKE combiner suitably combines the navigation data from the individual finger with the estimated multipath value and provides the final navigation data. A discussion on the use of the LMS for the carrier and code tracking is also presented.
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