Abstract
In this paper, a direct algorithm of calculating the ray-paths in multilayered media has been put forward. Compared with the Chander's iterative solution of the non-linear equation, the workload of the algorithm is much less than that of the Chander's. In case the transmitting and receiving points were given, the convergence of the ray-tracing only depends on the figure of the reflection and has nothing to do with the algorithm itself.
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