A multipath mitigation discriminator for GPS receiver

Authors: Fei Xiang, Guisheng Liao, Cao Zeng, Weiwei Wang

Abstract:
A novel technique for mitigating the multipath-induced code delay estimation error in Global Positioning System (GPS) is proposed. In contrast to conventional methods that aim to eliminate multipath signals, the proposed method exploits them to enhance the direct signal without affecting the accuracy of GPS code delay estimates. To achieve this, coherent accumulation of the received GPS signals is first done by transforming the received data into frequency domain and the parameters of multipath signals are then estimated by sparse reconstruction algorithm. Subsequently, a modified local reference signal is employed in delay lock loop (DLL) ofthe GPS receiver, which mitigates the pseudo-range estimation error and increases the correlation value of direct GPS signal. Simulation results demonstrate the performance and robustness of the proposed method.

Keywords:
GPS
Multipath parameter estimation
Multipath mitigation
Sparse reconstruction

Published in: AEÜ-International Journal of Electronics and Communications (Volume 67, Issue 10, October 2013)

Publisher: Elsevier

ISSN Information: 1434-8411

A multipath mitigation discriminator for GPS receiver

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