Irregular terrain radio wave propagation factor prediction method based on three-dimensional parabolic equation
A parabolic equation, radio wave propagation technology, applied in electrical digital data processing, image data processing, special data processing applications, etc., can solve problems such as limited prediction accuracy, achieve high versatility, wide engineering application scope, and extended application scope Effect
Inactive Publication Date: 2018-01-05
XIDIAN UNIV
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However, in this method, the two-dimensional slices are independent, and the prediction accuracy of the two-dimensional parabolic equation model is limited due to the inability to consider the influence of the lateral terrain on radio wave propagation. The research on the parabolic equation method is very necessary and has great value for wireless communication in complex environments
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[0035] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0036] refer to figure 1 , a method for predicting the propagation factor of radio waves in irregular terrain based on the three-dimensional parabolic equation, including the following steps:
[0037] Step 1) Establish a Cartesian coordinate system in the prediction area. Since the traditional digital map cannot describe the irregular undulating plane, the digital elevation map is used to establish a three-dimensional irregular terrain geometric model, and the digital elevation map modeling file is obtained. The implementation steps are:
[0038] Step 1a) In the three-dimensional parabolic equation model, the subdivision steps in the x direction and the y direction are very different. Therefore, a two-dimensional non-uniform grid is used to cover the three-dimensional irregular terrain, and the height value of each grid node is obtain...
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The invention provides an irregular terrain radio wave propagation factor prediction method based on a three-dimensional parabolic equation for solving the problem that a two-dimensional parabolic equation cannot consider the influence of transverse terrain to radio wave propagation properties. The irregular terrain radio wave propagation factor prediction method comprises the following steps: establishing a three-dimensional irregular terrain geometric model by using a digital elevation map; deducing a wide angle parabolic equation expressed by a bit function by using a maxwell equation; figuring out an initial field of the wide angle parabolic equation by using a current distribution function of an excitation source; figuring out the wide angle parabolic equation by using an improved step-by-step Fourier transform method to obtain a total field of the wide angle parabolic equation; constructing an attenuation function in a whole space, and correcting the amplitude of the total fieldof the wide angle parabolic equation; and calculating an irregular terrain radio wave propagation factor by using the total field of the wide angle parabolic equation considering the absorption boundary. By adoption of the irregular terrain radio wave propagation factor prediction method, the precision of prediction of the three-dimensional parabolic equation is improved, the application range ofthe digital elevation map is expanded, and the irregular terrain radio wave propagation factor prediction method can be applied to wireless communication and GPS positioning in complex environments.
Description
technical field [0001] The invention belongs to the field of radio technology, and relates to a radio wave propagation factor prediction method, in particular to a radio wave propagation factor prediction method for irregular terrain based on a three-dimensional parabolic equation, which can be used for wireless communication and GPS positioning in complex environments. Background technique [0002] With the rapid development of science and technology, wireless communication has been more and more widely used in various fields such as military affairs, industry, education, etc., and the influence it brings to people is indisputable. As we all know, wireless communication systems are realized by one or more radio wave propagation circuits. Therefore, in the field of wireless communication, the prediction of radio wave propagation characteristics has always been a research hotspot and has attracted more and more attention. In tropospheric radio wave propagation, the complex en...
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Inventor 郭立新关晓伟王亚姣
Owner XIDIAN UNIV