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Novel method for calculating local zenith tropospheric moisture delay by using meteorological data

A technology of zenith troposphere and meteorological data, applied in the field of accurate calculation of zenith tropospheric wet delay in local areas, can solve the problem of low precision of tropospheric wet delay model, and achieve the effect of avoiding low accuracy

Active Publication Date: 2018-11-30
中国人民解放军61540部队
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Problems solved by technology

[0004] The purpose of the present invention is: in order to solve the problem that the accuracy of the global tropospheric humidity delay model is not high in local areas, the present invention proposes a method based on the historical vertical section meteorological data of the area to be requested to calculate the weighted average temperature of the day, the direct reduction factor of water vapor, etc. The method of meteorological parameters can effectively improve the calculation accuracy of tropospheric wet delay

Method used

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  • Novel method for calculating local zenith tropospheric moisture delay by using meteorological data
  • Novel method for calculating local zenith tropospheric moisture delay by using meteorological data
  • Novel method for calculating local zenith tropospheric moisture delay by using meteorological data

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Embodiment 1

[0042] Embodiment 1: In this embodiment, the tropospheric delay value is calculated for the Wuyi area in Fujian Province (27°37′0″.84N, 117°59′6″.36E), which has a relatively humid domestic climate.

[0043] The example data includes the temperature, air pressure and water vapor pressure data of the vertical section at 6-hour resolution in the Wuyi area from 2011 to 2016.

[0044] Step 1: Calculate the vertical profile air temperature in 2016 by using formula (1) and combining the surface air temperature value in 2016 and the vertical profile air temperature in the previous 5 years (ie, 2011-2015).

[0045] Step 2: Statistically calculate the water vapor pressure gradient between 0 and H from 2011 to 2015 1 、H 1 ~H 2 、H 2 ~H 3 The average value of the three height intervals, where H 1 、H 2 、H 3 Set them at 2,000m, 6,000m, and 10,000m respectively, and calculate the ratio of the average values, and then use the formulas (2) and (3) to obtain the vertical profile water va...

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Abstract

The invention discloses a novel method for calculating local zenith tropospheric moisture delay by using meteorological data and belongs to the technical field of space geodetic surveying. The novel method is characterized in that meteorological parameters of daily weighted average temperature, vapor direct-attenuation factors and the like are acquired by calculation according to historical vertical profile meteorological data of the area to be calculated and specifically includes: calculating the vertical profile temperature value of the time to be calculated; building a water vapor pressureattenuation module and calculating the vertical profile vapor pressure of the time to be calculated; calculating the average weighted temperature; calculating the vapor direct-attenuation factors; calculating the daily tropospheric moisture delay. The variation characteristics of the meteorological parameters affecting the troposphere moisture delay are studied deeply; parameters of temperature, air pressure, vapor pressure and the like can be easily acquired according to the earth's surface, the tropospheric moisture delay of the area is calculated accurately, and high precision is achieved as compared by using a current global tropospheric delay model.

Description

technical field [0001] The invention relates to a method for accurately calculating the wet delay of the zenith troposphere in a local area, and belongs to the technical field of space geodesy. Background technique [0002] The GPT2w model constructed by Johannes Boehm et al. (2015) is currently internationally recognized as the most accurate global tropospheric delay model. This model divides the tropospheric delay model into two parts, dry and wet, and calculates them separately. The dry delay part continues the calculation method of the previous generation product GPT2 model, and can be accurately calculated according to the Saastamoinen dry delay formula combined with the local air pressure value and rough geographic coordinates The wet delay part is calculated according to the Askne&Nordius wet delay estimation formula. The main input parameters involved in the Askne&Nordius formula include weighted average temperature, water vapor direct reduction factor and surface w...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/10
CPCG06F17/10Y02A90/10
Inventor 孙中苗范昊鹏翟振和冯进凯
Owner 中国人民解放军61540部队
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