基于循环谱分析的LPI信号特征检测新方法研究

A Novel Research on Feature Detection of LPI Radar Signals Based on Cyclic Spectrum Analysis

本文提出一种LPI信号特征提取和参数估计的新方法,通过对LPI信号进行采用频域平滑周期图法估计循环谱,建立并采用"循环频率-谱频率域"分析信号内部特征,得到了LPI信号在该域内明显的分类特征和多维参数估计的方法。计算机仿真实验和性能分析均表明,该估计方法避免了多维搜索,计算量小,估计精度高,且不需要知道信号的先验信息,对于多种LPI信号具有良好的适应性,为LPI信号的截获接收和处理提供了一个新的思路,具有一定的工程意义。

A novel feature detection and parameters estimation method of LPI signals is presented in this paper. In which cyclic spectrum of LPI signals is estimated by FAM algorithm, building and adopting a new cyclic frequency--spectrum frequency domain to analysis signals feature inside, classification and multidimensional parameters estimation method for LPI signals is followed. The comput- er simulation and experimental results show that this estimation method is eomputationally efficient and has a high estimating accuracy. Moreover, this method need not the priori information,with a good flexibility and efficiency to LPI signals. A new thought is provided with a certain engineering meaning.