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A subspace-based code tracking loop design for GPS multi-antenna receiver in multipath environment
GPS Solutions ( IF 4.9 ) Pub Date : 2020-08-20 , DOI: 10.1007/s10291-020-01020-y
Xi Hong , Wenjie Wang , Ning Chang , Qinye Yin

Global Navigation Satellites Systems have been greatly developed in recent years, but receivers usually suffer the undesired measurement bias errors caused by multipath incidence in an urban area. We propose an effective subspace-based estimator cooperating with the conventional delay-locked loop (DLL) for Global Positioning System L1 C/A Signal. With the help of the multi-antenna, the incident rays could be distinguished in space. A forward and backward space spatial smooth technique is then taken to solve the coherent problem in signal subspace estimation. By using the structure of the receiving array, a subspace rotation invariance can be built, and the angles of arrival and relative delays of incident rays could be estimated jointly. After combining the estimates from DLL and subspace-based estimators, we can enhance the strength of the line-of-sight ray and achieve a modified delay tracking output without multipath bias effectively. Simulation results prove that compared with the existing methods, such as the narrow early-minus-late and the multipath estimating delay lock loop, the proposed method has the best multipath mitigation in the delay estimation.

中文翻译:

GPS多天线接收机多路径环境中基于子空间的码跟踪环设计

近年来,全球导航卫星系统得到了很大的发展,但是接收机通常会遭受市区多路径入射所引起的不希望的测量偏差误差。我们提出了一种有效的基于子空间的估计器,与全球定位系统L1 C / A信号的常规延迟锁定环(DLL)配合使用。借助多天线,可以在空间上区分入射光线。然后采用前向和后向空间空间平滑技术来解决信号子空间估计中的相干问题。通过使用接收阵列的结构,可以建立子空间旋转不变性,并且可以联合估计入射角和入射射线的相对延迟。将DLL和基于子空间的估算器的估算值合并后,我们可以增强视线射线的强度,并获得改进的延迟跟踪输出,而不会产生多径偏差。仿真结果表明,与现有方法相比,该方法在延迟估计中具有最佳的多径缓和效果,与现有方法相比,该方法具有较窄的早负延迟和多径估计延迟锁定环。
更新日期:2020-08-20
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