A Ray Tracing Method for Dynamic Adjustment of Cutting Surfaces Under Triangular Mesh Surfaces

A technology of triangular mesh and dynamic adjustment, applied in the field of mathematical models of creeping wave tracing, to achieve good tracing accuracy and stability, avoid optimization problems, and increase tracing speed.
CN106126794BActive Publication Date: 2019-07-05BEIHANG UNIV
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
BEIHANG UNIV
Publication Date
2019-07-05

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Abstract

The invention discloses a radial trailing method with a dynamically adjustable cut surface for a triangular mesh surface. The method comprises the steps of firstly parsing a triangular mesh file in an NAS format, and thus acquiring a chain table matrix of the triangular mesh surface; implementing an area-angular rate weighting method on the chain table matrix to acquire a normal vector of each node of the mesh; acquiring a valid shadow point of a target according to the normal vector of each node of the mesh, a radial trailing source point and an initial incident direction; and using the valid shadow point as a start, acquiring the cut surface based on a propagation direction and the normal vector of a current triangular mesh apex, continuously cutting until a trailing ending condition is met, acquiring a path matrix of creeping wave geodesic lines, and at last acquiring a creeping wave arc by using a fitting method. According to the method of the invention, the complex optimization problem is avoided, the trailing speed is enhanced, in addition, a creep wave tailing model adopts pure analytical geometry for computation, and thus the method has no numerical error and no optimization error, and is good in trailing accuracy and stability.
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Description

technical field

[0001] The present invention relates to a method for ray-tracing electromagnetic waves on a triangular mesh convex surface. More particularly, the present invention proposes a mathematical model and method suitable for creeping wave tracing for any target conforming to the characteristics of a convex surface. It belongs to the technical field of electromagnetic compatibility. Background technique

[0002] When studying high-frequency electromagnetic mutual coupling problems of electrically large targets, Uniform Geometric Diffraction Theory (UTD) is widely used for its high efficiency, high speed, and precision. The application of the theory to engineering problems is generally divided into two steps: first The first step is ray tracing; the second step is to calculate the dyadic diffraction coefficients of various rays. Among them, ray tracing is the most critical step. The first edition of "Geometric Diffraction Theory", edited by Wang Maoguang, June 1985...

Claims

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