该文研究伪码-线性调频复合体制侦察信号识别的平滑伪Wigner时频分析方法,推导了PRBC—LFM侦察信号的SPWVD时频分布函数,通过对ω=ω0+Kt截面上SPWVD分布分析,从中提取了与载频、调频斜率和伪码参数(子脉冲宽度、编码位数、脉冲周期等)有关的特性,设计了参数估计方法。最后在高斯噪声环境下对理论分析的结果进行了仿真,结果表明在相同的信号环境下,该文提出的方法对PBBC—LFM信号的参数估计精度优于基于谱相关以及基于Wigner分布的参数估计性能。
This paper presents a smoothed pseudo Wigner distribution for PN phase modulation composite reconnaissance signal recognition and deduces SPWVD functions for PRBC-LFM reconnaissance signal. By profile SPWVD distribution 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, theoretical analysis results are simulated under Gaussian noise conditions. Experiments show the method is superior to these methods based on the spectral correlation method and the Wigner distribution.