单通道扫描模式SAR/GMTI技术

首先介绍了地面动目标指示的原理,对动目标频谱进行了分析,详细讲述了单通道扫描模式地面动目标检测的原理方法,给出了动目标检测流程图。根据扫描模式下运动目标频谱特性,通过多普勒参数估计、杂波谱宽估计和抑制、帧间频道偏移估计及对齐等技术,有效解决了天线扫描引起的帧间频移问题。根据每个频道代表的频率以及所在的波位推算出动目标的运动参数,多帧分频道检测得到不同速度的动目标运动轨迹。结合实测数据,给出了单通道扫描模式下的地面动目标的检测结果。

Single-Channel SAR/GMTI Technique of Scan Mode

The theory of ground moving target indication（GMTI） is introduced and the frequency spec- trum of ground moving target is analyzed. The processing technique of single-channel scan-mode SAR/GMTI is described in detail. Then, the GMTI processing flow chart is represented. According to the frequency spectrum characteristics of moving target, by means of Doppler parameter estimation, main scatter spectrum width estimation and rejection, the estimation and correction among the context frames of frequency channel offset, the question of frequency shift between frames is settled effectively. According to the frequency of each channel and the beam position of the channel, the movement parameters of moving target are calculated. The tracks of different velocity moving targets can be got by detecting in each channel among many frames. The ground moving target is detected based on the reat SAR/GMTI data , The experimental GMTI result is obtained successfully.