一种低副瓣高分辨卷积型数字脉冲压缩方法  

A Method to Achieve Low Side-lobe and High Resolution in Convolution-based Digital Pulse Compression

作　　者：魏渊[1] 钟志峰[1] 

机构地区：[1]湖北大学物理与电子技术学院,湖北武汉430062

出　　处：《信息通信》2012年第6期57-59,共3页Information & Communications

摘　　要：在脉冲雷达系统中,为了增大雷达探测距离,发射宽的脉冲信号。而宽脉冲会带来雷达距离分辨力下降,使得较近的目标无法分离。为此,采用脉冲压缩技术实现对目标的分辨。在现代雷达系统中通过DSP进行数字脉冲压缩处理,其优点是容易通过算法的改进得到较好的目标识别性能。本文研究脉冲雷达的卷积型数字脉压方法,通过对窗函数频谱和加窗脉压效果关系和不同窗对脉压后的主副瓣影响的研究,提出了一种改进的低副瓣高分辨的数字脉冲压缩方法,其基本原理是:运用频谱主副瓣比较大的窗函数和频谱主瓣较窄的窗函数分别对参考信号进行加窗,利用切趾技术将加窗脉冲压缩后的信号进行最小值处理。实验结果表明了该方法的有效性。In the pulse radar system,in order to enlarge detected range,wide pulse signals must be emitted.However,the wide pulse echo brings the range resolution degrade,which will makes the very near targets not departed.To solve this problem,the pulse compression technique is adopted to depart those close targets.In modern radar system,digital pulse compression is disposed by DSP,one advantage of which is that it is easy to get good performance of depressing side-lobe only by improving the inner PC algorithms.In this paper we focus on researching digital pulse compression algorithm for the pulse radar.According to the relation between the spectrum of window function and the effect of windowed PC,and by the influence that all kinds of windows produce to main-lobe and side-lobe after PC,an improved digital PC method with low range side-lobe and high resolution is presented.Its primary principle is that,firstly the reference signal is windowed by different windows,one with big MSR and the other with narrow main-lobe in the spectrum,secondly take the minimum between these signals after windowed PC by apodization method.The experimental results show its effectiveness.

关 键 词：低副瓣 高分辨率 数字脉冲压缩 加窗脉压 切趾技术 

分 类 号：TN957.51[电子电信—信号与信息处理]