低速率矿山透地通信扩频信号的快速捕获方法研究

Research of fast acquisition method for low bit rate spread spectrum signal of mine through-the-earth communication

针对弹性波透地通信系统低频、低码速率的特点,提出了一种时分多通道分段滑动相关捕获方法。该方法对到达的码元进行分段接收,利用接收下一段码的时间处理之前接收的码段,即1个PN码周期分成若干个通道时隙,每个时隙对之前接收的PN序列段与通道的本地PN码进行快速滑动相关搜索。理论分析结果表明,在所需硬件开销与串并行搜索相同的情况下,使用时分多通道分段滑动相关捕获能获得与并行捕获相同的搜索速度;仿真结果进一步验证了该捕获方法的有效性。

For features of low frequency and low bit rate of elastic wave through-the-earth communication system, a time-division multiple channel segment sliding correlation acquisition method was proposed. The method receives arrived code element in segment, and uses time of receiving next segment code to deal with previous received code segment, namely 1 PN code period is divided into several channel time slots, each time slot carries out fast sliding correlation search between previous received PN sequence segment and local PN code of channel. The theoretical analysis result shows the time-division multiple channel segment sliding correlation acquisition method can get almost the same search speed with parallel acquisition when its hardware cost is the same to serial parallel search. The simulation result validates validity of the acquisition method.