雷达频域脉压处理中特殊旁瓣的抑制

现代雷达系统的线性调频、非线性调频和相位编码信号是应用最为广泛的几种脉冲压缩信号,当回波信号出现在某特定时刻时,采用传统频域方法来进行脉冲压缩处理会使脉冲压缩输出有一个较大的特殊旁瓣,此旁瓣将影响雷达信号检测。文中主要以线性调频信号为例分析了产生这种特殊旁瓣的原因,提出了两种抑制方法,并已应用于实际雷达系统中。

Suppression of Special Side-lobe in Radar Pulse Compression Processing in Frequency Domain

Pulse compression signals such as linear frequency modulated signal,nonlinear frequency modulated signal and phase code signal are widely used in modern radar system.For these signals,when the method of traditional frequency domain suppression is adopted,if the echo signal occurs at some particular time,the output of compression will contain a special side-lobe.The error may occur in the result of radar detection by this special side-lobe.In this paper,the cause of the side-lobe is analyzed by taking example for LFM signal.At last,two corresponding suppression methods are presented and have been applied in radar systems.