首先建立单运动点目标的高频合成孔径雷达(HF-SAR)信号模型;然后基于频域校正距离徙动的距离-多普勒算法和适合动目标的方位脉压函数,设计了一种动目标成像算法;最后通过仿真比较分别用静目标和动目标的方位脉压函数对动目标回波信号进行成像处理的结果,得出了动目标的距离向速度导致成像位置偏移,而方位向速度导致图像散焦的结论。仿真结果表明文中设计的动目标成像算法能够实现HF-SAR对运动点目标的精确成像。

Firstly,a HF-SAR signal model of a single moving target is set up.Then we design an imaging algorithm for moving targets based on range-Doppler algorithm with Range Cell Migration Correction(RCMC) in frequency domain and an azimuth pulse compression function appropriate to moving targets.Finally,we compare the imaging results of moving targets with the azimuth pulse compression functions for static and moving targets respectively through numerical simulation.The conclusion is that the radial velocity results in a shift of image position,and the cross-range velocity induces defocusing effect.Simulation results show that precise imaging of moving targets by HF-SAR can be implemented with the designed algorithm.It indicates that HF-SAR is feasible to be used in moving point target imaging with a single site radar.

TN957.5

国家高技术研究发展计划(863计划)