INS辅助的GPS快速捕获方法研究

在高动态环境下GPS信号的快速捕获对GPS接收机的性能提出了更高的要求。高速运动使接收机接收到的信号上附加了较大的多普勒频移,需要更多的时间捕获信号。通过惯导系统提供的惯性信息和星历数据估算多普勒频移,可减少搜索范围以缩短捕获时间。在分析传统的GPS信号快速捕获方法后,重点研究了惯性信息辅助GPS接收机快速捕获的方法,并对其捕获性能进行了分析,通过Matlab仿真验证该算法。结果表明高动态环境下运用该方法能够显著改善GPS接收机捕获性能,减少捕获时间。

Research on GPS Signal Fast Acquisition Method Aided by INS

Global Positioning System （ GPS ） requires the better performance of the GPS re- ceiver in high dynamic environment. High-speed motion makes the signal received by the receiver to be attached by the larger Doppler shift, which requires more time to capture sig- nal. Estimating the Doppler shift through inertial information and ephemeris data can reduce the search range to shorten the capt-ure time. This article the traditional fast acquisition method of GPS signal, then present a fast acquisition method aided by inertial information. After that, its capture performance is analyzed and this algorithm is verified through simula- tion. The results show that this method can significantly improve the performance of GPS receiver to capture signal and reduce the acquisition time in high dynamic environment,