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
Study on Reconnaissance Signal Parameter Evaluation of PN and LFM Based on Time-Frequency Analysis
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摘要: 研究了伪码-线性调频复合体制侦察信号识别的时频分析方法，推导了PRBC-LFM侦察信号的Wigner时频分布函数，通过对＝0 +Kt截面上WVD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分析的结果进行了仿真。结果表明该文提出的方法对PRBC-LFM信号的识别优于谱相关方法，而且应用不受调频带宽与伪码谱宽关系的限制。
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关键词:
- 参数估计;伪码;线性调频;时频分析
Abstract: 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. -
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