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采用二次型时频分析方法对多分量线性调频信号进行分析,获取信号的时频域能量分布。首先讨论了线性调频信号的两种二次型时频分布:魏格纳-威尔分布及其改进形式——重排魏格纳-威尔分布;在此基础上,进一步对比验证了霍夫变换和若当变换对线性调频信号时频域能量的积累效果,以实现噪声背景中的多分量线性调频信号检测。仿真结果显示基于二次型时频分布的处理是实现多分量线性调频信号检测的一个有效方法。
The quadratic time-frequency analysis method is used to analyze the multi-component chirp signal to obtain the energy distribution of the signal in the time-frequency domain. Firstly, two quadratic time-frequency distributions of LFM signals are discussed: the Wigner-Weir distribution and the improved form-rearranged Wigner-Weir distribution. On this basis, Transform and if the transformation of the chirp signal in the frequency domain energy accumulation effect in order to achieve noise background multicomponent chirp signal detection. The simulation results show that the processing based on the quadratic time-frequency distribution is an effective method for the detection of multi-component LFM signals.