therefore, based on the ann correlation signal post-processing technique, we designed a kind of sdf performed in spatial domain, and a two-step recognition technique was introduced to perform real-time distortion-invariant recognition by combining frequency domain filtering of sdf with spatial domain filtering of sdf 为此,本文在ann相关信号后处理技术的基础上引入了二次识别技术,设计制作了一种空域执行的sdf滤波器,采用频域sdf滤波与空域sdf滤波相结合的方法,对目标进行实时畸变不变识别。