正弦(简单脉冲,SP)信号基于重采样的匹配Fourier变换(MVT)谱的幅度最大值能够反映信号的频率。对SP信号的MFT幅度谱进行了分析后,提出了基于MFT的SP信号频率估计方法,完善了MFT理论;分析了线性调频(LFM)信号的MFT幅度谱与SP信号的相似性,提出了基于MFT的LFM信号参数估计方法;分析了MFT变换中改进谱特性时的窗函数应具有的特性,提出了低信噪比条件下提高参数估计精度加窗方法;最后进行了仿真试验。仿真结果表明了基于MFT的LFM信号参数估计算法的有效性。
The maximum amplitude of matching Fourier transform (MFT) spectrum based on re-sampling of sine (single pulse, SP) signal reflects the frequency of the signal. The analysis of the MFT spectrum of SP signal perfected the MFT theories, from which a method to estimate the frequency of SP signal was proposed. The similarity of the MFT spectrum of the SP and Linear FM (LFM) signal was analyzed, and then the parameter estimation of LFMsignal was presented. The characteristic of promote the MFT spectrum after adding windows was illustrated, so a method to improve the precision of estimation parameter by adding windows was proposed The experiments and simulations show the efficiency of the parameters estimation of LFM signal.