车载GNSS接收机多径抑制技术

The Multipath Mitigation Technique for Vehicle GNSS Receiver

在GNSS接收机的实际应用中,多径是影响定位精度的主要因素之一。在车载应用条件下,多径的影响由于快速的多径信道变化而变得更加明显,车载接收机的GNSS信号接收处理部分会受到包含周围运动车辆及其自身结构影响在内的复杂多径干扰。针对接收机的各个组成部分分析了天线设计、多径估计、多频测量、传感器融合等多种可用的多径抑制方法,并根据分析和比较结果指出:信号处理方法、基于导航的方法以及传感器融合方法是实现车载接收机多径消除的首选方法。

In the application of GNSS receiver, multi-path is one of the main influence factors which worsen the position precision. Especially, under the condition of vehicle appli- cation, the effect become more evidence due to the fast channel change of multi-path, and the GNSS signal process part is also influenced by multi-path generated by vehicles moving in the proximity and by constructions of the automotive vehicle itself. Multi-path mitigation tech- nique is introduced with regard to every element of receiver, include antenna design, multi- path estimate, multi-frequency measure, sensor fusion, etc.. The result of analysis and comparison indicates that the signal processing methods, navigation based solutions, and sensor fusion methods are preferred.