一种单通道SAR地面运动目标成像和运动参数估计方法

根据单通道高分辨SAR(Synthetic Aperture Radar)运动目标的回波包络和多普勒频谱的特性,本文提出一种利用二阶Keystone变换校正回波数据的距离弯曲,然后估计回波包络的斜率进行走动校正,再对运动目标的多普勒频谱进行分析得到运动目标的多普勒参数,进而对地面运动目标进行成像,同时完成对运动目标的定位,使运动目标在SAR图像中的正确位置上显示.另外,根据地面运动目标的多普勒参数和运动参数的关系,可以估计出运动目标的关键运动参数.结合仿真和实测数据的处理结果表明该方法可有效地对地面运动目标成像和运动参数估计.

An Effective Approach to Ground Moving Target Imaging and Motion Parameter Estimation for Single Channel SAR System

Based on the envelopes and the characteristic of Doppler frequency spectrum of returns in single synthetic aperture radar(SAR) systems a method is proposed,which adopts two order Keystone Transform to adjust the range distortion of echo data,then the slopes of echoes' envelopes are estimated to make some adjustments of walk and the Doppler parameters of moving targets are obtained through analyzing the Doppler frequency spectrum of the moving targets.At last the images and positions of ground moving targets are gained,which make it possible that the moving targets can be indicated in right positions in SAR image.In addition the key motion parameters of moving targets can be estimated by the relationship between the Doppler parameters and motion parameters of ground moving targets.The results of the simulative and raw data show that this method can image ground moving targets and estimate motion parameters effectively.