常见雷达信号分选算法研究

Research on sorting algorithm for common radar signal

在电子对抗中,信号往往复杂多变,对雷达信号的分选提出了新的要求.要准确地确定主辐射源,确定干扰手段,就要从一连串脉冲流中分选出来自同辐射源的脉冲序列.为了分选时域上不同特征的雷达信号——常规信号、抖动信号以及参差信号——先后对PRI变换法、改进了的PRI变换法以及SDIF法这三种分选算法进行了研究,并对这些算法在不同参数上分别用Matlab进行了仿真,实验表明PRI变换法能检测常规信号,但不能检测抖动雷达信号以及参差雷达信号的子周期;改进后的PRI变换法可以检测10%以内的抖动信号;而SDIF算法不仅能检测出常规信号和参差信号,而且运算量较小,达到了分选常见雷达信号的目的.

In electronic countermeasure environment,signals are dense and complex,which are new challenges to radar signal sorting. For the purpose of leading the countermeasures system choose the main radiation source and determining the interference means promptly and accurately,pulse sequence derived from the same source of the radiation must be sorted from a series of staggered pulses exactly. In order to sort different characteristics of the radar signal on the time domain——normal signal,staggered PRI signal and dither signal,PRI transform algorithm,the improved PRI transform algorithm,and SDIF algorithm are studied in sequence and simulated with Matlab by different parameters. At last the application conditions,the advantages and disadvantages of each algorithm were analyzed. It showed that PRI transform algorithm can sort normal signal,but it cannot sort either signal or the child PRI of staggered PRI signal. The improved PRI transform algorithm could sort dither signal which dithered no more than 10%,and SDIF algorithm could not only sort normal signal and staggered PRI signal,but also has a easier computational work. The aim of sorting common radar signal has been achieved.