弹载SAR大斜视改进CS成像算法

摘要

针对弹载SAR在成像过程中复杂的运动状态,以及大斜视所造成的频谱混叠问题,建立了大斜视加速运动模型.引入新的CS因子,有效解决了距离频谱混叠问题并补偿了导弹在三方向速度和加速度的影响;引入方位deramp处理方法,有效解决了方位多普勒频谱混叠问题.仿真结果表明该方法优于现有算法.%A model for the high squint accelerated motion is built in order to deal with missileborne SAR ' s complicated motion state and solve the spectral overlapping phenomenon. The spectral overlapping phenomenon in distance is effectively solved by introducing a new CS factor, and the influence caused by velocity and acceleration of the missile is compensated.A deramp method is introduced to cope with the Doppler spectral overlapping phenomenon in azimuth. Simulation results shows this method outperforms existing ones.