扩频通信系统中一种改进的快速编码捕捉方法

针对扩频通信系统中传统的滑动相关捕捉法对于较长的刚码序列编码捕捉时间较长的问题，提出了一种改进的编码捕捉方法，该方法采用三条相同支路同时搜索的方式来实现PN码的快速捕捉，不仅不受PN码长度限制，而且电路实现简单，可以有效的降低虚警概率。理论分析和仿真实验均表明：提出的改进方法大大缩短了系统的捕捉时间。

An improved scheme of fast code acquisition in spread spectrum communication systems

In the spread spectrum communication systems,the conventional scheme of slide-correlation acquisition has a disadvantage that it needs a long time for the systems to acquire the synchronization with the received PN code sequence,especially when the sequence length is longer.In order to solve this problem,this paper proposes an improved scheme of code acquisition,which achieves PN code acquisition by three parallel circuits,the improvement is that the scheme isn't confined by the code length,but also effectively reduces false alarm probability,and the circuit is simple.The theoretical analysis and simulation results show the improved scheme shortens systemic acquisition time.