一种高动态微弱扩频信号捕获方法

Acquisition Method of Weak Spread Spectrum Signal under High Dynamic Condition

针对高动态低速率微弱扩频信号捕获灵敏度低的问题,提出了一种动态码序列匹配方法。该方法按照与接收信号相同的多普勒频率和多普勒频率变化率等动态特性生成本地载波和扩频序列,对接收信号进行混频和码序列匹配,并将匹配结果进行多比特非相干累加。仿真结果表明,和常规处理方法相比,动态码序列匹配方法提高了接收设备的捕获灵敏度,且消耗的硬件资源和软件架构不变,特别适用于工程应用。

Aiming at the problem of low acquisition sensitivity of weak spread spectrum signal with high dynamic and low rate,a matched correlation algorithm based on dynamic spread spectrum code sequences is proposed.The algorithm generates local carrier and spread spectrum sequences according to the same dynamic features of Doppler and Doppler rate-of-change with received signals.The received signals are mixed with local carrier and matched with dynamic spread spectrum code sequences,and the matching results are accumulated incoherently.The simulation results show that compared with traditional algorithms,the proposed algorithm can improve the acquisition sensitivity of the receiving equipment under the same hardware and software architecture,so it is especially suitable for engineering applications.