调频步进雷达扩展目标高分辨距离像分析

Analysis of Achieving High Resolution Profile of Extended Target for Stepped Chirp Radar

本文首先对扩展目标的一维距离像进行了离散建模;然后给出了扩展目标调频步进雷达回波信号的数学模型,证明了调频步进雷达相参合成扩展目标一维距离像原理;文章分析了目标运动对合成距离像的影响,推导了运动目标合成距离像的距离单元走动计算公式,给出了运动目标一维距离像二次相位误差补偿的速度临界值;最后给出了计算机仿真,证明了本文的结论.

A discrete model is firstly set up for High Resolution Profile of an extended target;then the paper presents the math model of echo signal from an extended target for a Stepped Chirp Radar, and proves the principle of synthesizing a HRRP of an extended target by phase coherent integration. The paper studies the effect of motion status on the synthesized HRRP, derives a equation to calculate the shift of HRRP for motion target, and gives a critical velocity for compensating quadratic phase error for a HRRP of a motion target. At last, the paper presents a computer emulation of synthesizing HRRP and proves the conclusion of the paper.