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对于方位大斜视角、宽观测带、高分辨率机载合成孔径雷达(SAR)系统,由于距离徙动量巨大,若采用固定波门采样技术,将导致无效数据量过大。针对这一技术问题,提出一种在雷达回波窗不跨脉冲重复周期的情形下连续变采样开启波门技术方法,根据距离徙动变化曲线,连续变化采样开启波门位置,以此对距离徙动进行校正,可解决固定采样开启波门存在的无效数据量过大的技术问题。通过SAR系统仿真、机载飞行试验获得的高质量成像结果,验证了此方法的有效性。
For azimuths with large oblique angles, wide observation zones and high resolution SAR systems, the fixed wave gate sampling technique will result in an excessive amount of invalid data due to the huge amount of migration. Aiming at this technical problem, this paper proposes a technique of continuously variable sampling open-gate in the case that the radar echo window does not cross the pulse repetition period. Based on the curve of distance migration, Migration to correct, can solve the fixed sampling to open the door there is a large amount of invalid data excessive technical problems. Through the SAR system simulation, high-quality imaging results obtained from airborne flight tests verify the effectiveness of this method.