基于改进B分布自适应窗长时频分析的伪码调相-载波调频复合引信信号的参数提取研究

摘要

研究了基于改进B分布的自适应窗长时频分析的理论及其实现方法,利用该方法对伪码体制复合引信信号进行脉冲内特征分析,这些信号具体包括伪码调相信号、伪码调相与正弦调频复合信号、伪码调相与线性调频复合信号.仿真结果表明,在信噪比为3 dB时,利用该种自适应窗长时频分析技术,不但可以提取载频调制的特征信息,而且能够有效提取相位突变位置的特征信息.%The theory and implementation of an adaptive window length time frequency analysis method based on the improved B distribution were presented. The method was used to analyze the in-pulse characteristics of pseudo-code fuse signals, such as pseudo-code phase modulation (PCPM) signal, combined pseudo-code phase modulation and sinusoid frequency modulation (SFM) signal, and combined pseudocode phase modulation and linear frequency modulation (LFM) signal. The simulation result shows that both the characteristics of carry frequency modulation and phase changed position caused by the pseudocode can be extracted effectively for SNR = 3 dB.