DS信号伪码周期及码片速率估计的自相关法

Estimation of period and chip rate of pseudo-noise sequence for direct sequence spread spectrum signals using correlation techniques

直扩(DS)信号是高抗干扰低截获率信号,有关DS信号及其参数的检测与估计具有重要的意义。DS信号对抗的首要任务就是必须检测与估计到DS信号及相关参数,包括伪码周期、码片速率等。但是由于DS信号往往淹没在噪声中传播,致使常规的信号处理方法无法直接应用。针对DS信号及其参数的检测与估计问题,综合了有关信号处理的相关处理方法,提出了一种可以检测DS信号并同时估计其伪码周期、码片速率参数的自相关方法。理论分析和实验表明该方法在较低信噪比环境下能较好地工作。

The first task of DS signal countermeasures is to detect and estimate the parameters of DS signals, which include period and chip rate of pseudo-noise （PN） sequence. Because the level of DS power spectrum is very low, the classical methods of signal detection and estimation could not be applied directly to the field of DS signal processing, Aiming at the problem of detection and parameter estimation of DS signals, the correlation methods of DS signal processing are synthesized, and a new method which can estimate the parameters of period and chip rate of PN sequence simultaneously is proposed. Theory analysis and experiment results show the method can work well in the high-level noise environment.