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Adaptive multipath mitigation tracking system for GPS receiver

机译:GPS接收机的自适应多径缓解跟踪系统

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摘要

Multipath effects are the major source of error in GPS differential positioning. In this paper, an adaptive multipath mitigation tracking system is presented for GPS applications. It is comprised of four function blocks, those being (1) adaptive path estimator (APE), (2) multipath interference reproducer (MP1R), (3) Rake-based delay locked loop (RB-DLL), and (4) Rake-based phase locked loop (RB-PLL). Only the short delay condition with delay less than 1.5 PN chip is considered here, because GPS pseudorange error envelope decreases to zero for delay time greater than 1.5 PN chip. In order to estimate reflection profile in the correlation domain, the FFT-based circular correlation and block average method (BAM) are utilized to offer significant savings in computational complexity. The APE estimates the delayed profiles and coefficients of the reflection signals. By using the path parameters from APE, the corresponding multipath arms are activated to accomplish the multipath reproduction. These replica profiles are used for subtracting the reflection components from carrier and code discriminators before sending it into the Rake-based carrier/code tracking loops. Simulation results show that our proposed method provides a better performance in terms of multipath error envelope and carrier-phase error.
机译:多径效应是GPS差分定位误差的主要来源。在本文中,提出了一种适用于GPS应用的自适应多径缓解跟踪系统。它由四个功能块组成,分别是(1)自适应路径估计器(APE),(2)多路径干扰重现器(MP1R),(3)基于Rake的延迟锁定环(RB-DLL)和(4)Rake锁相环(RB-PLL)。在此仅考虑延迟小于1.5 PN芯片的短延迟条件,因为对于大于1.5 PN芯片的延迟时间,GPS伪距误差包络减小为零。为了估计相关域中的反射轮廓,利用了基于FFT的循环相关和块平均法(BAM)来显着节省计算复杂性。 APE估计反射信号的延迟轮廓和系数。通过使用来自APE的路径参数,相应的多路径臂被激活以完成多路径再现。这些副本配置文件用于在将其发送到基于Rake的载波/代码跟踪循环之前,从载波和代码标识符中减去反射分量。仿真结果表明,该方法在多径误差包络和载波相位误差方面具有较好的性能。

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