一种基于相位调制的雷达二次回波抑制方法

A Radar Secondary-Trip Echo Suppression Method Based on Phase Modulation

二次回波形成的虚假目标影响了雷达对感兴趣目标的探测。采用相位调制的方法首先对雷达发射脉冲信号的相位进行调制,再对回波信号的相位进行校正。由于二次回波调制相位与当前的校正相位存在残差,通过控制该相位残差,使二次回波的能量在多普勒维上均匀分布,从而降低了二次回波被检测概率。该方法同样适用于多次回波,具有一定的工程应用价值。

False targets formed by secondary-trip echoes negatively affected radar detection of targets of interest.In this paper,a phase modulation method was used to modulate the phase of the radar transmitted pulse signals.Then,the phase of the echo signals was corrected.Therefore,there were residual differences between phase of the secondary-trip echoes and corrected phase.The energy of the secondary-trip echoes was evenly distributed in the Doppler dimension by controlling the phase residual differences,thereby reducing the detection probability of the secondary-trip echoes.The method was also suitable for multiple-trip echoes.It had certain engineering application value.