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Evaluation and reduction of multipath-induced bias on GPS time-of-arrival

机译:GPS到达时间的多径偏差的评估和减少

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摘要

New expressions are presented for the multipath-induced pseudorange error (i.e. bias) and variance introduced by multipath onto the time-of-arrival estimate obtained using a noncoherent early-late gate discriminator. The results include the effect of front-end bandwidth and early-late gate spacing. We also investigate a blind method for cancelling the multipath, in order to improve the time-of-arrival estimate. Our approach uses early-late gate processing on an objective function derived from an adaptive finite impulse response (FIR) filter that attempts to match the crosscorrelation of the received signal with a multipath-free replica of the desired crosscorrelation. This method performs reasonably well, and decreases the multipath-induced pseudorange error by approximately a factor of 2, even in very stressing multipath environments.
机译:针对由多路径引起的伪距误差(即偏差)和由多路径引入到使用非相干早晚门鉴别器获得的到达时间估计上的方差给出了新的表达式。结果包括前端带宽和较早的栅极间隔的影响。我们还研究了取消多径的盲法,以改善到达时间的估计。我们的方法对从自适应有限冲激响应(FIR)滤波器派生的目标函数使用早期后期门处理,该函数试图将接收信号的互相关与所需互相关的无多径副本进行匹配。该方法性能相当好,即使在压力很大的多路径环境中,也可以将多路径引起的伪距误差降低大约2倍。

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