合成孔径雷达平台角运动误差测试系统设计

System Design for Testing Rotational Motion Errors of Airborne Synthetic Aperture Radar Platform

分析了SAR(合成孔径雷达)天线指向误差对其成像质量的影响及某型机载SAR在商用载机成像飞行时的运动特性,在此基础上设计了针对此类机载SAR的天线稳定转动控制平台,并采用二维仿真转台模拟载机角运动,提出了对角运动误差的测试方案.借助现代虚拟仪器技术完成了对载机角运动误差的高性能测试.通过对所研制的实用样机系统合成孔径雷达天线转动模拟仿真平台的测试,证明采用该方案进行测量其角运动误差精度可达到3°‰.

After analyzed the impact of point errors of antenna on the quality of imaging of SAR, the paper then explicated the rotational characteristic of yaw and roll axis while commercial airplane used by a certain airborne SAR was in the statement of imaging flying. On the foundation of this, further design of stable rational control platform which was aimed at such airborne SAR was made out, and used twoaxis simulator to simulate rotational motion of airplane, and put forward testing scheme of rotational errors. Depending on the technology of modern virtual instrument, high-performance testing to airborne rational errors was performed. The testing which was carried out in the developed utility sample systemthe simulating platform of SAR antenna-proved that the accuracy of rational motion errors in the system can reach up to 3°‰.