一种非线性调频信号设计方法  

Method for Designing Nonlinear Frequency Modulation Signal

作　　者：刘雅倩 白晓娟[1] 张学波 LIU Yaqian;BAI Xiaojuan;ZHANG Xuebo(College of Physics and Electronic Engineering,Northwest Normal University,Lanzhou 730070,China)

机构地区：[1]西北师范大学物理与电子工程学院,甘肃兰州730070

出　　处：《兵器装备工程学报》2021年第S02期227-231,共5页Journal of Ordnance Equipment Engineering

摘　　要：传统基于加权处理的旁瓣抑制方法会带来信噪比的损失、分辨率下降等问题,从而使得图像中较弱的目标被掩盖,为解决这个问题,本文基于分段思想设计了一种非线性调频信号,分析了调频信号的模糊函数、时延模糊函数、多普勒模糊函数等性能指标,最后采用计算机仿真并且验证所设计的信号。结果表明:相比传统线性调频信号的加权处理方法,所设计的信号可在不损失信噪比的条件下,极大地降低峰值旁瓣比,有利于弱目标的检测。The traditional sidelobe suppression method based on weighted processing will bring about the loss of signal-to-noise ratio(SNR),resolution reduction and other problems,so that weaker targets in the image were covered.In order to solve this problem,this paper designed a nonlinear frequency modulation(NLFM)signal based on the segmentation idea,and its ambiguity function,time delay ambiguity function,doppler ambiguity function and other performance indicators were analyzed.Finally,computer simulation experiments were used to verify the designed signal.The experimental results show that compared with the traditional weighted processing method of linear frequency modulation(LFM)signal,the designed signal can greatly reduce the peak sidelobe ratio without loss of the SNR,which is very conducive to the detection of weak targets.

关 键 词：脉冲压缩 非线性调频信号 旁瓣抑制 主瓣宽度 模糊函数 

分 类 号：TN957.3[电子电信—信号与信息处理]