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弹载SAR通过在距离向发射大带宽调频信号,方位向采用聚束模式来获得二维高分辨率,由此带来高数据率并造成频谱混叠,导弹的非平面运动会引入空变的相位误差.针对上述两个问题,提出了TDDRD算法,该算法利用二维Deramp处理降低了数据率并解决了频谱混叠效应,进而应用改进RD算法,补偿加速度引入的线性、二次及三次相位误差.计算机仿真通过对比未补偿和补偿加速度的成像结果,验证了该算法的有效性,证明该算法可用于高分辨率弹载聚束式SAR成像.
Missile-borne SARs acquire a two-dimensional high resolution by using beamforming in azimuth to launch large bandwidth FM signals, resulting in high data rates and spectrum aliasing, and the missile’s non-planar motion introduces a phase change To solve the above two problems, a TDDRD algorithm is proposed, which reduces the data rate and resolves the spectral aliasing effect by using two-dimensional Deramp processing, and then applies the improved RD algorithm to compensate the linear, secondary and tertiary phase errors introduced by acceleration Computer simulation verifies the effectiveness of this algorithm by comparing the imaging results of uncompensated and compensated accelerations, and proves that this algorithm can be used in high resolution SPUN SAR imaging.