一种基于脉间波形捷变的雷达目标检测方法

A method for radar target detection based on inter-pulse waveform agility

针对发射脉冲间载频、重频和初始相位联合捷变情况下雷达目标检测问题,研究了一种基于脉冲同步对齐技术和变DFT因子法的目标检测方法,首先针对脉压后的回波进行快时间维的初相相位项和距离相位项的补偿,然后对补偿后的信号在慢时间维上进行同重复周期且同频脉冲信号的等效变换,以实现相参积累完成目标检测.该方法克服了脉间捷变波形相位不连续导致的无法相参积累问题,实现了相参积累检测目标的效果.仿真结果表明,该方法对理想匀速点目标有较好的适用性.

In order to detect radar target with joint agility of carrier frequency,repeated frequency and initial phase between transmitted pulses,this paper studies a target detection method based on pulse synchronization alignment technology and variable DFT factor method.Firstly,the initial phase term and distance phase term of the fast time dimension are compensated for the echo after pulse compression,and then the equivalent transformation of the compensated signal with the same repetition period and the same frequency pulse signal is carried out in the slow time dimension so as to achieve coherent accumulation to complete target detection.This method overcomes the problem of impossible coherent accumulation caused by phase discontinuity of inter-pulse agile waveform,achieving the effect of detecting the coherent accumulation target.The simulation results show that the proposed method has good applicability to ideal uniform point target.