高速GPS接收机信号捕获算法研究

Research on the Signal Acquisition Algorithm for High Speed GPS Receiver

针对高速度环境中运行的GPS接收机对信号捕获时间的要求,研究了C/A码快速捕获技术。在传统的FFT并行码捕获方法的基础上提出一种基于数字信号抽取处理的FFT快速码捕获算法。首先应用卫星信号模拟器产生GPS信号,然后利用中频数据采集器采集中频信号,最后对这种快速捕获算法进行仿真实现,并与传统的FFT码捕获算法进行对比分析。仿真结果表明,这种基于抽取处理的FFT码捕获算法具有更快的捕获速度,更适用于高速度环境中工作的GPS接收机。

The C/A code rapid acquisition technology is studied according to the signal acquisition time requirements of GPS receiver running in high speed environment. A fast code acquisition method is proposed based on the extraction ideas in digital signal. This algorithm is validated by simulation and compared with tra- ditional FFT code acquisition algorithm. The results show that the faster acquisition method of C/A code based on extraction is more suitable and efficient for the GPS receiver operated in the high speed environment.