external arithmetic meaning in Chinese

机外运算
外部运算
外算术

On the base of analyzing sar image and jimming , this dissertation study the characteristic of sar images and sar jamming method . with analyzing the characteristic of radar image aim , this dissertation puts forward an external arithmetic for sar jamming evaluation based on the image quality and target detecting , and gives the scales for jamming evaluation and the method of target detecting
本文在分析sar图像机理的基础上,从干扰对抗的角度出发,对sar图像特性,干扰方法等几个方面进行了研究,根据对雷达目标对象和目标识别技术的分析,给出了一个基于图像质量和目标检测的客观干扰效能评估体系,并给出了可用于干扰效能评估的指标和检测方法。