在声像的数字重建方法中,反向传播法(B-P法)具有一系列优点。但是,当成像距离相当近时,用惯常的B-P法,声像的横向分辨率将被空间取样间隔所限制,达不到成像系统应有的瑞利分辨率。本文对产生这一问题的原因进行了理论分析,提出了一种解决方法-空间频率域增值法,并对B-P法中的高阶像问题进行分析讨论。文中给出了有关计算机模拟结果。 Backpropagation method (B-P method) has a series of advantages in the digital reconstruction method of sound image. However, when the imaging distance is relatively close, the conventional B-P method will limit the lateral resolution of the sound image to the spatial sampling interval and will not reach the Rayleigh resolution of the imaging system. This paper makes a theoretical analysis of the causes of this problem, proposes a solution - spatial frequency domain value-added method, and analyzes and discusses the high-order image problems in the B-P method. The paper gives the results of computer simulation.