基于概率分布的SAR-GMTI目标定位误差分析

Analysis of Target Location Errors in SAR-GMTI Based on Probability Distribution

由于地面上动目标存在径向速度,在合成孔径雷达成像(SAR)图像上产生方位向的位置偏移。为了能够在SAR图像上正确显示目标位置并对其聚集成像,需要对动目标重新定位。文中介绍了常用的多通道SAR地面动目标显示的定位误差分析方法,并提出了一种基于误差概率分布的定位精度分析新方法。该方法有效地将复图像的视数、相干性、信杂噪比、检测门限、干涉幅相统计特性有效结合,更符合实际情况,同时对系统定位指标设计具有较好的指导意义。

Ground moving targets are displaced in azimuth on the Synthetic Aperture Radar （SAR） image due to existence of radial ground speed component. Relocation of moving targets is important for showing accurately the target positions on the SAR image and focusing target imaging. The analysis methods of target location errors in multichannel SAR-GMTI in common use are summa- rized firstly, then a new analysis method based on probability distribution is proposed, which combines effectively the number of looks, coherence of complex images, signal-clutter-noise ratio, detection threshold and statistic characteristic of interferometric phase and magnitude. Thus the image is more in accord with the actual situation. Furthermore, the new method has guiding significance for multichannel SAR-GMTI system position parameter design.