【摘要】 本文研究了线性调频连续波SAR的距离徙动算法成像。线性调频连续波SAR发射的信号周期较长,雷达在发射和接收信号期间不能再视为静止,STOP AND GO近似不能再视为有效。针对线性调频续波SAR的特点,在STOP AND GO近似成立的条件下,讨论距离徙动算法的实现过程。STOP AND GO近似失效时,通过补偿线性调频连续波SAR连续运动引入的多普勒频移,将此运动产生的多普勒频移转化成对距离的影响,对距离徙动算法提出了改进,并给出点目标的仿真验证。更多还原

【Abstract】 Range-migration imaging algorithm of Linear Frequency-modulated Continuous Wave Synthetic Aperture Radar(LFM CW SAR)is studied in this paper.Due to the long transmitting period of LFM CW SAR,the radar can not be assumed stationary anymore during the transmission and the reception of the signal,and STOP AND GO approximation may no longer be valid.Considering the feature of LFM CW SAR and the premise of approximated STOP AND GO condition,we present the specific implementation of Range Migration Algorithm(RMA).When STOP AND GO approximation is invalid,the continuous motion throughout SAR observation time should be considered.A modification to RMA is proposed in order to compensate Doppler frequency shift introduced by the continuous motion.Targets simulation results are also given.更多还原