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.%Global Positioning System (GPS) requires the better performance of the GPS receiver 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 signal. 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 simulation. 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.
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