基于阵列天线的一种GPS多径抑制方法

为了抑制多径效应对GPS的严重影响，在分析了多径效应对伪码跟踪环路影响的基础上，提出了一种基于空间平滑的改进稳健波束形成算法来抑制GPS多径效应。以直线阵为基础，采用前后向空间平滑算法对阵列接收信号进行预处理，针对各种失配，采用改进的稳健波束形成算法进行处理。该方法既可以有效地抑制GPS多径效应，又可以有效地改善伪码跟踪环路的跟踪精度。仿真实验结果验证了所提方法的正确性和有效性，具有较高的工程实践价值。

A Novel GPS Multipath Suppression Method Based on Array Antenna

In order to suppress the serious impact of multipath effects on the GPS receiver, by analyzing how multipath effects affect pseudo-code tracking loop, an improved robust beamforming algorithm based on spatial smoothing is proposed. The proposed method is based on the uniform linear array, and the received coherent array signals are preprocessed by adopting forward spatial smoothing technique. Then, the improved robust beamforming algorithm is used to deal with all kinds of mismatch. It could not only achieve the purpose of multipath effects suppression, but also effectively enhance the accuracy of code tracking in GPS receivers'' delay-locked loop (DLL). The simulation results demonstrate the validity and efficiency of the proposed method, which has high engineering practice value.