P码直接捕获的算法研究

本文对GPSP码在低信噪比和较大多普勒频移情况下的直接捕获算法进行了研究、分析,对直接平均法、匹配滤波法和FFT辅助部分相关捕获法这三种算法进行了仿真,并对它们的捕获性能和实现进行了比较。通过比较可知FFT辅助部分相关捕获方法将二维搜索转为一维搜索,具有较好的抗噪声能力和较快的捕获时间,更适合工程使用。

Algorithm Research on Direct Acquisition of GPS P-Code

The direct acquisition algorithm of GPS P-code under low-SNR and large Doppler frequency is studied and analyzed in this paper. Direct average method, matched filtering method and partial correlated method based on FFT are all simulated and compared with each other according to the performance and realization of the acquisition. Through the contrast we can see that, partial correlated method based on FFT transform 2-D to 1-D. It has the ability of anti-noise and faster acquisition time, so more suitable for engineering.