Short-wave ground wave simulation method and system applied to complex terrain
A technology of complex terrain and simulation methods, applied in complex mathematical operations, design optimization/simulation, special data processing applications, etc., to achieve the effects of simple calculation, high efficiency, and fast calculation efficiency
Inactive Publication Date: 2021-07-27
NAVAL UNIV OF ENG PLA
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Problems solved by technology
[0004] Aiming at the above defects or improvement needs of the prior art, the present invention provides a short-wave ground wave simulation method and system applied to complex terrain, so as to solve the problem that the prior art cannot perform both high-efficiency and precision to meet engineering requirements under complex terrain. Technical Problems in Calculation of Short Wave Ground Wave Propagation
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example 1
[0139] Example 1: The transmitting antenna is a vertical monopole antenna, the radiation power of the antenna is 1kw, the calculation frequency is set to 20MHz, and the height is 1 / 4 of the wavelength.
[0140] The ground is flat terrain, and the ground parameter is ε r =40, σ=0.03 / s×m -1 , set the distance between the dividing line and the antenna as 1λ, 2λ, 3λ, 4λ, 5λ, 6λ and 7λ respectively.
example 2
[0141] Example 2: The transmitting antenna is a vertical monopole antenna, the radiation power of the antenna is 1kw, and the calculation frequencies are set to 5MHz, 10MHz, 15MHz and 20MHz respectively.
[0142] The ground is flat terrain, and the ground parameter is ε r =70, σ=5 / s×m -1 .
example 3
[0143] Example 3: The transmitting antenna is a whip antenna, the operating frequency is 20MHz, the height is 1 / 4 of the wavelength, and the radiation power is 1KW. They are respectively erected on the center of the roof of an equivalent building with a length of 15m, a width of 15m, and a height of 30m and on a flat ground. '31.8336"N, 114°02'46.0964"E) to point B (32°55'32.0012"N, 112°55'35.5770"E).
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The invention discloses a short-wave ground wave simulation method and system applied to a complex terrain. The method comprises the following steps: determining a boundary which corresponds to a to-be-simulated region and is used for distinguishing a far region from a near region; constructing a three-dimensional model for near region calculation to calculate current and magnetic current on each curved surface of the near region to obtain current distribution and magnetic current distribution of the near region, and obtaining a scattering magnetic field generated by each curved surface of the near region on a Gaussian integral sampling point coordinate; taking a plane where a two-dimensional model for far region calculation is located as a reference plane, and extracting a z-direction component of a scattering magnetic field of a Gaussian integral sampling point on the boundary to obtain an incident field for far region calculation; setting a boundary condition and a stepping length for far region calculation, solving the two-dimensional model by adopting discrete mixed Fourier transform to obtain a field intensity value at a next stepping position, carrying out iterative calculation to obtain a field intensity value at a point to be predicted, and further solving to obtain a magnetic field and an electric field vertical component at the point to be predicted. The technical problem that in the prior art, short-wave ground wave propagation calculation which is efficient and enables the precision to meet engineering requirements cannot be carried out under complex terrains is solved.
Description
technical field [0001] The invention belongs to the technical field of short-wave ground wave propagation calculation, and in particular relates to a short-wave ground wave simulation method and system applied to complex terrain. Background technique [0002] With the development of electromagnetic simulation technology, the prediction of radio wave propagation characteristics in complex environments has become an important research direction. Using simulation calculation methods to predict ground wave propagation characteristics in complex environments is useful for antenna erection, communication resource analysis and scheduling, etc. Apps are valuable. The high-order method of moments is an efficient algorithm based on integral equations, which uses high-order basis functions to discretize the distribution of electric and magnetic currents on high-order surfaces. [0003] High-order basis functions can be divided into high-order interpolation basis functions and high-ord...
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IPC IPC(8): G06F30/20G06F17/16G06F17/15G06F17/14G06F111/10
CPCG06F30/20G06F17/141G06F17/15G06F17/16G06F2111/10
Inventor 张志刚王立峰高鼎明傅鸿伟赵林冯慧婷
Owner NAVAL UNIV OF ENG PLA