文中在GPSP码扩展复制重叠(XFAST)捕获算法和均值捕获算法的基础上,提出一种基于时频融合的捕获算法,通过对本地序列进行XFAST处理,在不影响相关度的基础上扩大搜索范围;并对处理后的本地和接收序列进行均值处理,相当于减少之后相关的码元个数的方法,最终达到提高捕获速度的目的。文中对该算法的可行性进行了分析,给出了算法的具体处理过程,仿真实验验证了该方法的有效性。

Based on the GPS P code extended replication overlap (XFAST) acquisition algorithm and the mean acquisition algorithm, a time-frequency fusion algorithm based on time-frequency fusion is proposed. Through the XFAST processing of the local sequence, the search is expanded without affecting the correlation. The mean local processing of the processed local and received sequences is equivalent to the number of related symbols after reduction, that is, the amount of computation is reduced, so as to achieve the purpose of improving the capture speed. In this paper, the feasibility of the algorithm is analyzed, and the specific process of the algorithm is given. The simulation results verify the effectiveness of the proposed method.