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针对机载合成孔径雷达(SAR)的应用,开展机载SAR自主定位技术研究,提出通过对目标所在区域多次成像进行机载SAR自主定位的算法。该算法不受载机速度和角度误差的影响,仅利用载机瞬时位置和雷达与目标之间的距离,能够大幅提高机载SAR自主定位精度;并在载机凝视目标飞行时提出基于最小二乘的定位算法,进一步提高定位精度。最后对机载SAR实测试飞数据进行处理,并与传统的基于距离多普勒(R-D)模型的定位方法进行了比较,处理结果验证了提出的算法能够大幅提高机载SAR自主定位精度。
Aimed at the application of airborne Synthetic Aperture Radar (SAR), the research on autonomous positioning technology of airborne SAR is carried out. The algorithm of autonomous positioning of airborne SAR by multiple imaging of the target area is proposed. The algorithm is not affected by the speed and angle error of the carrier. Using only the instantaneous position of the carrier and the distance between the radar and the target, the autonomous positioning accuracy of the airborne SAR can be greatly improved. At the same time, Take the positioning algorithm to further improve the positioning accuracy. Finally, the experimental flight test data of airborne SAR are processed and compared with the conventional method based on distance Doppler (R-D) model. The processing results verify that the proposed algorithm can greatly improve the autonomous positioning accuracy of airborne SAR.