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Method for Estimating Normalized Fog Attenuation of Electromagnetic Waves

A normalization, electromagnetic wave technology, applied in the direction of calculation, electrical digital data processing, special data processing applications, etc., can solve the problem of large absolute value of relative error and other problems

Inactive Publication Date: 2016-01-20
BEIHANG UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0023] Although there are currently 5 empirical formulas, the above empirical formulas have their own best applicable frequency range and temperature range. The calculation results show that the maximum value of the absolute value of the relative error of the above empirical formula in the millimeter wave frequency band is relatively large.

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  • Method for Estimating Normalized Fog Attenuation of Electromagnetic Waves
  • Method for Estimating Normalized Fog Attenuation of Electromagnetic Waves
  • Method for Estimating Normalized Fog Attenuation of Electromagnetic Waves

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Embodiment Construction

[0042] according to figure 1 and figure 2 The shown flow chart determines the parameters in formula (15) and formula (16) respectively, and finally it can be known that the empirical formula proposed by the present invention is K l _ new = ( - 0.10606 + 0.0016174 f 1.69238 ) * θ 9.2419 - 0.068303 f + 3.5236 × 10 - 5 f 2 .

[0043] In order to test the empirical formula proposed by the present invention, select the following 3 indicators to compare the new em...

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Abstract

When the wave lengths of electromagnetic waves are larger than the size of fogdrop, a Rayleigh absorption approximation model can be used for calculating attenuation of the electromagnetic waves caused by fog, the calculation result is accurate, but the calculation process is complicated. The invention provides an empirical formula used for estimating normalization fog attenuation of the electromagnetic waves. Applicable temperature range of the formula is between-8 DEG C and 20 DEG C, and the frequency range is between 30 GHz and 100 GHz. Compared with an existing empirical formula, the empirical formula used for estimating the normalization fog attenuation of the electromagnetic waves has the advantages of being high in calculation accuracy and high in correlation coefficient, according to the calculation results, a maximum value of the absolute value of relative errors of the empirical formula and the Rayleigh absorption approximation model is not more than 4.48%.

Description

(1) Technical field [0001] The invention relates to a method for estimating the normalized fog attenuation of 30-100 GHz electromagnetic waves, which belongs to the field of tropospheric electric wave transmission. (2) Background technology [0002] Millimeter wave and microwave system have almost the same long history, but due to the short wavelength of millimeter wave, it has a large loss in the process of atmospheric propagation, and the development of key components such as power source has been slow before, leading to the development of millimeter wave technology. Applications are far less extensive than microwave technology. In recent years, the development and breakthrough of technologies such as millimeter-wave solid-state sources and new high-power millimeter-wave electric vacuum sources have brought millimeter-wave systems back to the attention of many scholars. [0003] At present, there is no exact definition of the millimeter wave frequency band. Generally, the...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00
Inventor 毛峡刘运龙
Owner BEIHANG UNIV