SAR相位闪烁效应的最小熵自聚焦抑制方法

Minimum Entropy Self-focusing Suppression Method for SAR Phase Flicker Effect

针对均匀成像场景中合成孔径雷达信号的方位向相位闪烁问题,提出了基于种群编码的最小熵自聚焦方法。通过遗传算法对最小熵方法进行数值优化,采用种群变量作为相位误差曲线采样点,利用最小熵算法确定相位误差强度范围,作为初始种群参与遗传迭代,解决了种群变量与熵函数非直接映射和运算负荷大的问题。实验表明,该算法能有效提高最小熵自聚焦方法的解算效率,提高合成孔径雷达图像的相位闪烁补偿效果。

Aiming at the azimuth phase flicker of synthetic aperture radar signal in uniform imaging scene,a minimum entropy self-focusing method based on population coding is proposed.The minimum entropy method is numerically optimized by genetic algorithm.Population variables are used as sampling points of phase error curve,and the minimum entropy algorithm is used to determine the range of phase error intensity.As the initial population,it participates in genetic iteration,which solves the problems of indirect mapping between population variables and entropy function and large computational load.Experimental results show that this algorithm can effectively improve the calculation efficiency of minimum entropy autofocus method and improve the phase flicker compensation effect of synthetic aperture radar images.