线性调频信号的匹配滤波处理

雷达信号处理完成压制噪声和杂波,从而有效地检测出有用信号的功能。采用匹配滤波器可使输出信噪比达到最大。本文介绍了匹配滤波器的设计原理,给出了白噪声匹配滤波器和有色噪声匹配滤波器的传递函数模型。在MATLAB/Simulink平台上,建立了雷达发射信号为线性调频信号时匹配滤波器的仿真模型。计算机仿真表明,线性调频信号经匹配滤波器后脉冲宽度被大大压缩,信噪比得到了显著提高。该滤波器的脉冲压缩功能,解决了一般脉冲雷达通过增加脉冲宽提高作用距离与距离分辨力下降的矛盾。

Matched filtering processing for linear FM signal

The radar signal processing has the function of effective detecting useful signal by suppressing noise and clutter.Matched filter can make the output SNR reach the maximum.The design principle of matched filter was introduced,and the model of transfer function of matched filter for white noise and colored noise were given.Based on MATLAB/Simulink,the simulation model of matched filter for linear FM signal was setup.The simulation showed that the pulse width was pressed largely when the linear FM signal through a matched filter,and the SNR was enhanced evidently.This matched filter,through pulse pressing,solved the conflict between the raising of detection range and the falling of the range resolution in common pulse radar.