非线性调频脉压系统工程实现研究

Research on the Engineering Realization of the Pulse Compression System for NLFM

线性调频信号的脉压系统的应用已在提高雷达的性能方面展现了显著的优势 ,而其需加权抑制距离旁瓣引起主副瓣比降低造成信噪比损失 ,非线性调频(NLFM)信号因固有的距离旁瓣较低而无需加权处理 ,避免了失配损失而倍受关注。本文阐述了NLFM信号的产生和脉压的基本原理 ,结合雷达系统的要求 ,在分析比较了几种波形产生和脉压原理及实现方法的基础上 ,基于DDS技术和专用DSP芯片 ,设计了数字化的NLFM信号的波形产生及脉压处理系统 ,测量分析结果与模拟仿真基本吻合 。

The application of the pulse compression system for the LFM signal has a lot of advantages in moden radar systems. But it needs to be weighted to restrain the range sidelobes and this processing will bring loss of SNR. The NLFM signal with the implicit lower range sidelobes need not be weighted to avoid the loss, so the engineers have paid more attention to it. This paper studied the basic principles of the producing and the pulse compression for the NLFM signal. Based on the DDS technology and the professional DDS chips,this paper applies a pulse compression system for the NLFM signal, and gives the results of the experiment system.