一种基于相干累加的并行伪码快速捕获算法

摘要

A pseudo⁃code fast⁃acquisition algorithm suitable for high dynamic and low SNR conditions is proposed in this paper. Based on the performance analysis of coherent and non⁃coherent accumulation with same cumulative length,the spread⁃spectrum gain and sweep points are optimized,and then a grading acquisition parallel processing method based on time⁃domain PN code is proposed. Simulation and analysis results indicate that the proposed method can significantly improve the perfor⁃mance of fast signal capture in high dynamic environment.%介绍了一种适于高动态、低信噪比环境下的伪码快速捕获算法。分析了相同累加点数下，相干累加和非相干累加各自的优缺点，并在此基础上对扩频增益和扫频点数量方面进行优化，进而提出一种基于时域PN码相关的分级捕获并行处理的方法。仿真结果和分析表明，该方案能在高动态环境下实现信号的快速捕获。