We present a new and improved formulation of Rytov approximation (RA) using the theory of ray tracing in low loss media for solving the direct scattering problem. The resultant model provides an accurate prediction of wave scattering in the presence of electrically large scatterers with high permittivity and small loss tangent. The high validity range and the straightforward linear formulation of the proposed model make it suitable for accurately predicting the received signal strength (RSS) in indoor environments. We provide experimental results from a real indoor environment to show that the proposed method closely matches the experimental RSS values and achieves up to ten times higher validity range than any other existing linear approximate models. Also, since the proposed method provides an accurate solution to the direct scattering problem, it can be an ideal candidate for inverse scattering applications.

中文翻译：

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使用高频 Rytov 近似估计室内环境中的接收信号强度


我们使用低损耗介质中的射线追踪理论提出了一种新的改进的 Rytov 近似 (RA) 公式，用于解决直接散射问题。由此产生的模型可以在存在具有高介电常数和小损耗角正切的电大散射体的情况下准确预测波散射。该模型的高有效性范围和简单的线性公式使其适合准确预测室内环境中的接收信号强度（RSS）。我们提供了真实室内环境的实验结果，表明所提出的方法与实验 RSS 值非常匹配，并且有效范围比任何其他现有线性近似模型高出十倍。此外，由于所提出的方法为直接散射问题提供了准确的解决方案，因此它可以成为逆散射应用的理想候选方法。