Study on Reconnaissance Signal Parameter Evaluation of PN and LFM Based on Time-Frequency Analysis
基于时频分析的伪码与线性调频复合体制侦察信号参数估计研究

A time-frequency analysis method for reconnaissance signal recognition of PN and LFM is studied, wigner time-frequency distribution function for PRBC-LFM reconnaissance signal is deduced, By WVD analysis, features related to carrier frequency, FM slope and PN parameters such as sub-pulse width, code-length and pulse cycle are extracted. Then a method for the parameter evaluation is presented. Finally, analysis results are simulated under Gaussian noise conditions. Simulation show the method is superior to spectral correlation method on PRBC-LFM signal recognition and not limited to relations between bandwidth of FM and spectral width of PN.