一种基于相位扫描的机载SAR运动补偿算法及实现

An airborne SAR motion compensation algorithm based on array scanning and its implementation

机载SAR采用相控阵天线是一个重要发展方向,而运动补偿系统对机载SAR系统至关重要.本文采用坐标映射的方法将大地坐标系下的预定波束指向映射到天线平台坐标系下,并转换为天线阵元的相位偏移,完成波束控制,实现了机载SAR的运动补偿.在基于DSP和FPGA的硬件平台上实现了该算法.初步实验结果验证了软、硬件的正确性.

Phased array radar is the main direction in the development of airborne SAR,and the motion compensation system is essential to the airborne SAR system. By deploying the coordinate mapping method,the target beam under the earth coordinate system is mapped into the antenna platform coordinate system and converted to the antenna array element phase shift which controls the beam. The airborne SAR motion compensation is then implemented. The algorithm is implemented by using DSP and FPGA. The experimental results show that the designed hardware and software are reliable.