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12 May 2006 GPS DLL discriminator tracking performance in a dominant multipath environment
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Multipaths of the GPS signal reaching the GPS receiver lead to undesirable tracking errors and inaccurate ranging information. In this paper, we consider the multipath effect on noncoherent early-minus-late power discriminator. Analytical treatment of the effect of the carrier phase offset of the multipath relative to the direct path on the GPS receiver performance is provided. Compared with the well-known coherent discriminator, the noncoherent discriminator presents different tracking accuracy and sensitivity to multipath delay, magnitude, and phase. The paper considers the front-end precorrelation filter, which is typically applied to remove out-of-band interference and noise. Selections of suitable precorrelation filter bandwidth in conjunction with the early-late correlator spacing can aid in mitigating the multipath impeding effects on delay lock loop (DLL) and receiver discriminators. Computer simulations of the impact of a dominant multipath on the discriminator tracking performance are provided. It is assumed that the early and late correlations are performed within the same navigation symbol, and no symbol transitions are encountered over the correlation interval.
© (2006) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Liyu Liu and Moeness Amin "GPS DLL discriminator tracking performance in a dominant multipath environment", Proc. SPIE 6248, Wireless Sensing and Processing, 62480W (12 May 2006);


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