S型非线性调频信号的谱修正脉压研究

首先阐述了非线性调频信号的设计原理,介绍了S型非线性调频信号的波形设计方法。针对匹配后脉压主副比还不满足雷达工作的实际要求,对匹配后输出波形采用谱修正技术,对一组不同BT值的信号进行了仿真,与频域加窗方法进行了对比。仿真数据表明此方法提高了脉压后的主副比,且SNR损失和主瓣展宽小,有一定的实用性,并对其数字脉压的工程实现有一定的指导意义。

Research on Spectra Modified Pulse Compression of S-Mode Nonlinear Frequency Modulated Signal

This paper first presents the design principle of nonlinear frequency modulated signal. The waveform design method of S-mode nonlinear frequency modulated signal is introduced, aiming at the compression result failed to meet the practical requirement after matched filter, the spectra modification technique is adopted to simulate a set of signals with different products of timewidth and bandwidth. Comparison with the method of adding window in frequency domain is made. The simulation result demonstrates that the technique improves the ratio of mainlobe to sidelobe, and the loss of SNR and the extend of mainlobe width are small.