Enhancing GPS Receiver Tracking Loop Performance in Multipath Environment using an Adaptive Filter Algorithm

S  Mariappan; G  Sasibhusana Rao  and Swarna Ravindra Babu

doi:10.17485/ijst/2014/v7sp7.15

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Enhancing GPS Receiver Tracking Loop Performance in Multipath Environment using an Adaptive Filter Algorithm

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Indian Journal of Science and Technology

DOI: 10.17485/ijst/2014/v7sp7.15

Year: 2020, Volume: 7, Issue: Supplementary 7, Pages: 156–164

Original Article

Enhancing GPS Receiver Tracking Loop Performance in Multipath Environment using an Adaptive Filter Algorithm

S. Mariappan^1*, G. Sasibhusana Rao² and Swarna Ravindra Babu³

1 AU College of Engineering, Andhra University, Visakhapatnam, Andhra Pradesh, India; jaymars_2000@yahoo.com
2 AU College of Engineering, Andhra University, Visakhapatnam, Andhra Pradesh, India; sasi_gps@yahoo.co.in
3 Samsung India, Bangalore, India; swarna.ravindrababu@gmail.com

This work is licensed under a Creative Commons Attribution 4.0 International License.

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.

Keywords: Multiple Finger Combiner, LMS, Multipath, RAKE Receiver