基于频率分集的MTI雷达目标检测方法

A Target Detection Method Based on Frequency Diversity for MTI Radar

基于参差重频的特征矢量动目标显示(Moving Target Indication,MTI)滤波器既有最优的杂波抑制性能,同时又可避免“盲速”现象,因此倍受青睐。但是,该方法的MTI速度响应曲线不平坦,在某些速度处其响应存在明显凹口,会导致该速度目标的检测概率变低。鉴于此,本文提出一种基于频率分集的MTI雷达目标检测方法,该方法通过多载频将MTI的速度不平坦区域错开,再对各载频MTI滤波结果进行积累,完成目标检测。该方法可以提高MTI雷达的动目标检测性能,同时可以提高雷达系统的抗干扰能力。

The eigenvector MTI method based on staggered PRF is popular in engineering because it has the optimal clutter suppression performance and can avoid the"blind speed"phenomenon.However,the speed response curve of the method is uneven and it has obvious grooves at some speeds,which lowers the detection probability of targets at the speeds.In this paper,a target detection method based on frequency diversity is proposed for MTI radar.The proposed method staggers the uneven region of MTI speed response by means of multiple carrier frequency,and then integrates the MTI filtering results of each carrier frequency,completing target detection.The proposed method can improve the moving target detection performance and anti-jamming capability of MTI radar.