GPS微弱信号捕获算法

Algorithm for GPS Weak Signal Acquisition

捕获是GPS接收机信号处理中的关键部分,在微弱信号情况下,FFT快速捕获等传统方法不能很好地捕获到卫星信号,将采用一种改进的方法——相关积分与批式捕获相结合的方法进行捕获研究。并对一组GPS实测数据信息,分别采用以上两种方法对其进行捕获仿真。结果显示,采用改进的方法捕获到了较微弱的GPS信号,提高了接收机的灵敏度,并能有效避免由导航数据位翻转造成的误捕获。

Signal acquisition is the key phase of GPS signal processing. Sometimes ,GPS signals are too weak to be received or processed by traditional methods. This paper presents the block and coherent processing acquisition method. A data set collected is used to verify the algorithm, and the result shows that the improved method can capture the GPS weak signal successfully. And it can solve the problem brought by navigation data signal t ransition during the correlation process.