研究如何使扩展频谱系统接收机的伪随机序列捕获时间最小 .扩频信号传播过程中由于多径效应、多普勒效应以及接收机的时钟不稳定性产生一个时频不稳区 ,接收机必须在此区域内搜索伪随机序列的同步相位 .为了减少捕获时间 ,在接收机中将伪随机序列分成一系列的短段落 ,利用码匹配滤波器 (CMF)在每个短段落里分别计算互相关 ,然后将这些互相关值累加和参考门限比较 ,在以上计算基础上同时讨论了跟踪与数据中继卫星系统中扩频接收机使用CMF技术的扩频序列捕获性能 ,只要将输出SNR限制在一定范围内 ,就可获得满意的结果 We study how to minimize the acquisition time of the pseudo-random sequence in the spread spectrum system receiver.As the multipath effect, the Doppler effect and the clock instability of the receiver produce a time-frequency instability zone in the spread of the spread spectrum signal, the receiver must Search for the synchronization phase of the pseudo-random sequence in this region.In order to reduce the acquisition time, the pseudo-random sequence is divided into a series of short segments in the receiver, and each short segment is calculated by means of the code matched filter (CMF) Then, these cross-correlation values ​​are summed up and compared with the reference threshold. On the basis of the above calculation, the performance of the spread spectrum sequence acquisition using the CMF technique in the tracking and data relay satellite system is also discussed. As long as the output SNR is limited to a certain level Within the range, you can get satisfactory results