A Parabola-Based Calculation Method of Regional Tropospheric Wet Delay

A calculation method, tropospheric technology, applied in the field of global navigation systems, to achieve the effect of improving accuracy

Active Publication Date: 2021-10-19
SOUTHEAST UNIV
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Problems solved by technology

The model correction method can estimate the tropospheric dry delay with an accuracy of more than 90%, but the accuracy of the tropospheric wet delay is only about 20%.

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  • A Parabola-Based Calculation Method of Regional Tropospheric Wet Delay
  • A Parabola-Based Calculation Method of Regional Tropospheric Wet Delay
  • A Parabola-Based Calculation Method of Regional Tropospheric Wet Delay

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Embodiment Construction

[0033] In order to make the object, technical solution and advantages of the present invention clearer, the specific implementation cases of the present invention will be described below in conjunction with the accompanying drawings.

[0034] The invention discloses a parabola-based regional tropospheric wet delay calculation method, the flow of which is as follows figure 1 shown, including:

[0035] S1: Collect the sounding data, yearly date and spatial position data of each sounding station in the target area, and calculate the true tropospheric wet delay T of each sounding station based on the collected sounding data ZWD ; The spatial location data is a latitude value and an altitude value;

[0036] Table 1 Meteorological data of 1028 sounding stations

[0037] PRES HGHT TEMP DWPT RELH MIXR DRCT SKNT THTA THTE THTV hPa m C C ％ g / kg deg knot K K K 1009 18 -3.5 -5.1 89 2.6 135 12 269 276.1 269.4 1003 65 -2....

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Abstract

The invention discloses a parabola-based regional tropospheric wet delay calculation method, which includes: 1. Collecting the sounding data, annual cumulative days and spatial position data of each sounding station in the target area, and calculating according to the collected sounding data The true value of the tropospheric wet delay of each sounding station; 2. Establish a parabolic function model of the tropospheric wet delay; 3. The true value of the tropospheric wet delay, annual cumulative day, latitude value, and altitude value of the sounding station obtained in step 1 Substitute into the tropospheric wet delay parabolic function model, determine the coefficients, and obtain the tropospheric wet delayed parabolic function model in the target area; The tropospheric wet delay parabolic function model is used to obtain the calculated value of the tropospheric wet delay of the site to be measured. This method is suitable for locations where radiosonde data cannot be obtained, and considering the influence of seasons, it can obtain more accurate tropospheric humidity delays.

Description

technical field [0001] The invention relates to the field of global navigation systems, in particular to a method for calculating tropospheric wet delay according to the spatial position of the ground to be measured. Background technique [0002] Atmospheric delay errors mainly include ionospheric delay errors caused by ionospheric refraction and tropospheric delay errors caused by tropospheric refraction. The main components of the Earth's atmosphere include dry air, water vapor, and various particles. About three-quarters of the atmosphere and 99 percent of the water vapor are concentrated in the troposphere. Due to the influence of the earth's gravity, the atmosphere is unevenly distributed in the vertical direction of the troposphere, and its density roughly decreases with height . When GNSS radio signals propagate through the troposphere, on the one hand, the propagation speed of the signal will change, and on the other hand, the troposphere will produce non-dispersiv...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/07
CPCG01S19/07
Inventor 胡伍生李小翠聂檄晨严宇翔张志伟
Owner SOUTHEAST UNIV
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