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为了解决合成孔径雷达(SAR)运动测量单元精度不高对成像的影响,提出了一种SAR盲成像算法。该算法利用SAR接收数据在距离Doppler域的统计特性,通过对比度最大化方法搜索正确的距离徙动轨迹,实现了在Doppler参数未知情况下的数据校直;还利用了不依赖速度初值的自聚焦方法。给出了实现步骤。星载SAR实测数据实验结果表明,该算法可以在无任何关于SAR平台运动的先验信息的情况下,实现高质量成像。
In order to solve the problem that the accuracy of motion measurement unit of Synthetic Aperture Radar (SAR) is not high, a SAR blind imaging algorithm is proposed. The algorithm uses the statistical characteristics of the SAR received data in the distance Doppler domain and searches for the correct distance migration trajectory by using the maximum contrast method to achieve data alignment under unknown Doppler parameters. Focus method. Given the implementation steps. Experimental results of spaceborne SAR data show that this algorithm can realize high quality imaging without any prior information about the movement of SAR platform.