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Least-Squares Minimization Technique for Multipath Mitigation in GNSS Receivers

Nunes, F. ; Sousa, F. ; Leitão, J.

Least-Squares Minimization Technique for Multipath Mitigation in GNSS Receivers, Proc European Navigation Conf. - ENC-GNSS, Toulouse, France, Vol. 1, pp. 1 - 11, April, 2008.

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Abstract
The paper is a contribution to design alternative structures to the conventional delay lock loop (DLL), aiming to improve the receiver's performance in multipath scenarios, especially in the close-in region. The proposed receiver is based on a bank of correlators, whose outputs feed a nonlinear least-squares minimization algorithm. The selected minimization procedure is the the Levenberg-Marquardt algorithm which is tested with C/A, BOC and MBOC signals. Simulations confirm that the proposed method exceeds the performance of the conventional DLL structures for small excess delays. Besides, the receiver's performance improves when the signal-to-noise ratio increases permitting its application in multipath weak signal scenarios through the use of large integration intervals.