不使用W码情况下捕获Y码的相关算法及其快速实现

New correlative algorithm and its fast implementation for the acquisition of Y-code without the use of W-code

GPS军用定位系统使用P/Y伪随机码进行捕获,进而后续进行跟踪与解算。研究在不使用W码的情况下对Y码进行捕获的可行性方案。首先,提出捕获方法的一种新的相关算法,然后,进行算法的仿真,并与标准的相关算法进行比较,说明新的相关算法的性能特点。最后,提出了一种基于分段FFT的快速计算方法,用来加速新的相关算法的计算。给出快速计算方法的正确性证明,并使用Matlab仿真验证快速计算方法的高效性。

GPS military positioning system uses P/Y-code to capture signals and then go through tracking and navigation solution. The feasibility research on the acquisition of Y-code was given without the use of W-code. First the basis of the acquisition method was presented. Then, comparison with the standard correlative algorithm the simulation of the algo-rithm was given to show the characteristics of the new algorithm. At last a segment FFT-based fast implementation of the algorithm was proposed. The correctness of the fast implementation method was proved and Matlab was used to compare the fast implementation with the basic algorithm to show the high efficiency of the former method.