基于窗函数频谱设计NLFM信号波形的方法性能分析

Performance Analysis of NLFM Signal Waveform Design Method Based on Window Function Spectrum

本文基于相位逗留原理,利用常见的几种窗函数频谱分别实现了对NLFM信号波形的设计。首先,验证了NLFM信号匹配脉压波形具有低旁瓣电平的特点,并将其与经过谱修正滤波之后的NLFM信号脉压性能在主瓣展宽、主副瓣比方面进行了对比分析,实验结果表明,随着信号时带积的增加,谱修正后信号的脉压性能越来越好。同时,对所设计NLFM信号的多普勒容限进行了仿真,验证了NLFM信号对多普勒频移敏感。

In this paper,based on the principle of phase lingering,the NLFM signal waveform was designed by using several frequently-used window functions.Firstly,it was verified that the NLFM signal pulse pressure waveform was matching with the characteristics of low side-lobe level;the pulse pressure of NLFM after spectrum correction filter was compared concerning main lobe widening performance as well as main-lobe and side-lobe ratio.The comparative analysis of the experimental results showed that with higher the signal time delay and bandwidth with product,the revised spectrum signal pulse pressure performance became better.At the same time,the Doppler tolerance of NLFM signal was simulated and verified,which showed that NLFM signal was sensitive to Doppler shift.