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An Improved Simple Algorithm for Zenith Attenuation of Radio Waves Below 350ghz

A simple and radio-wave technology, applied in design optimization/simulation, instrumentation, informatics, etc., can solve problems such as inapplicability, and achieve the effects of good applicability, accurate estimation, and real-time estimation

Active Publication Date: 2020-04-28
XIDIAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The latter input conditions are easier to obtain, but the model only includes the surface atmospheric pressure, which is not applicable to different climates and seasons

Method used

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  • An Improved Simple Algorithm for Zenith Attenuation of Radio Waves Below 350ghz
  • An Improved Simple Algorithm for Zenith Attenuation of Radio Waves Below 350ghz
  • An Improved Simple Algorithm for Zenith Attenuation of Radio Waves Below 350ghz

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Embodiment Construction

[0021] Refer to attached figure 1 , using the present invention to calculate path attenuation specific implementation steps are as follows:

[0022] Step 1, determine that the frequency is a window frequency less than 350GHz, and the detector is in the direction of the zenith;

[0023] Such as figure 2 As shown, except for the water vapor absorption peaks shown in the figure: 22GHz, 183GHz and 380GHz; oxygen absorption peaks: 50-70GHz frequency band and 118GHz frequency bands, all of them absorb smaller window frequencies. In these frequency bands, the accuracy of the improved equivalent height model is higher.

[0024] Step 2, utilizing the approximate formula proposed by the present invention and surface atmospheric temperature, pressure to calculate dry air equivalent height;

[0025] The approximate formula of dry air equivalent height based on surface temperature and pressure is written as:

[0026]

[0027] in:

[0028]

[0029] t 3 =c 0 +c 1 f+c 2 f 2...

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Abstract

The invention discloses an improved simple algorithm for zenith attenuation of radio waves at 350 GHz and below. A concept of equivalent height is introduced, the equivalent height is an equivalent distance, the atmosphere at the distance is considered uniform, the path attenuation is equal to the zenith attenuation, and the zenith attenuation can be conveniently calculated by using the equivalentheight. An improved equivalent height model introduces the temperature and the humidity on the surface of the earth, so that the adaptability to different regions is better. By means of the algorithm, the estimation of the earth-space path attenuation of the millimeter waves and sub-millimeter wave bands is more accurate and has real-time performance, because the earth-space path attenuation cannot be neglected in design of the communication link in these frequency bands.

Description

technical field [0001] The invention relates to a simple and convenient method for estimating the zenith attenuation of radio waves below 350 GHz. The equivalent height model in the ITU-R P.676-11 recommendation is improved by introducing surface temperature and humidity, so that the calculation accuracy of the zenith attenuation is improved. High and real-time. Background technique [0002] In recent years, the development of millimeter wave and submillimeter wave band hardware has made it possible to expand its application range, such as high-speed satellite-based communication, radar detection and remote sensing. Therefore, in applications such as communication link design and remote sensing signal analysis, the attenuation of the ground-air link must be considered. [0003] Since the 1980s, many propagation models have been proposed based on spectral experiments: Liebe proposed the MPM (Millimeter-wave Propagation Model) model in the late 1980s; Urban proposed the Molie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20
CPCG16Z99/00
Inventor 李海英林乐科吴振森张肖肖赵振维卢昌胜
Owner XIDIAN UNIV