短波突发信号盲检测算法的对比研究

Comparative research on blind detection algorithm of HF burst signal

根据短波串行突发MPSK信号的格式和特点,分别提出了2种短波突发信号盲检测算法。对于无导频突发信号,提出了一种基于滑动窗高阶累积量的自适应门限检测算法。该算法采用高阶累积量作为检测函数来区分有用信号和噪声,通过设置检测函数集自适应调整门限值,采用长度控制与状态转换的判决机制降低检测函数的抖动对判决结果的影响。对于有导频突发信号,采用归一化瞬时功率谱密度的最大值来捕获导频脉冲,再结合基于高阶累积量的自适应门限算法检测出突发信号的结束点。仿真实验及对实际信号的检测结果表明,文中提出的2类算法检测性能好、便于实时处理,可以较好地运用于实际工程。

Two kinds of blind detection algorithm of HF burst signal were proposed respectively,which were based on the format and characteristics of HF serial burst MPSK signal.For the burst signal of pilot-less frequency,a kind of self-adaptive threshold detection algorithm was proposed,which was based on the higher-order cumulant of sliding win-dow.The algorithm used higher-order cumulant as detection function to distinguish the useful signal and noise.By setting the self-adaptive adjustment threshold of detection function collection,the adjudication mechanism of length control and state transition were adopted to reduce the effect of dithering of detection function on the judgment results.For the burst signal of pilot frequency,the maximum value of uniformization instantaneous power spectrum density was used to cap-ture the pulse of pilot frequency.Then combing the self-adaptive threshold algorithm based on the higher-order cumulant,it was detected the end point of proruption signal.Simulation experiment and the detecting result of actual signal show the two kinds of algorithm put forward have good performance.And they are convenient for real-time dispose,which can be applied in the actual engineering.