In optics and acoustics this equation describes the propagation of electromagnetic or pressure waves through some non-homogenous medium.

反向传播网络(Back-Propagation Network，简称BP网络)是将W-H学习规则一般化，对非线性可微分函数进行权值训练的多层网络 -Back Propagation Network (Back-Propagation Network, referred to as BP networks) is to learn the rules WH generalized, non-linear differentiable function on weight training m

为了减小NLOS 传播的影响，基于几何结构的单次反射统计信道模型，该文提出一种NLOS 环境下的TOA/AOA 定位算法。利用RBF 神经网络较快的学习特性和逼近任意非线性映射的能力，对NLOS 传播的误差进行修正以减小NLOS 传播的影响，再利用最小二乘(LS)算法进行定位，从而提高系统的定位精度。-In order to mitigate the effect of NLOS propagation, based on the Geometry Based Single- Bounced