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A Method for Obtaining Regional Tropospheric Zenith Delay

An acquisition method and tropospheric technology, applied in the field of satellite navigation, to achieve the effect of easy implementation, remarkable accuracy and high precision

Inactive Publication Date: 2018-02-09
TONGJI UNIV
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  • Description
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Problems solved by technology

When modeling the grid function, the generation of the grid point tropospheric zenith delay is usually performed by the ordinary kriging interpolation method, but due to the regional characteristics of the tropospheric zenith delay, the ordinary kriging difference method is not always applicable

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  • A Method for Obtaining Regional Tropospheric Zenith Delay
  • A Method for Obtaining Regional Tropospheric Zenith Delay
  • A Method for Obtaining Regional Tropospheric Zenith Delay

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Embodiment

[0055] The calculation of the tropospheric zenith delay model value is based on the meteorological parameters of the GPT function, using the Saastamoinen model, and the dry and wet delay calculation is shown in formula (1):

[0056]

[0057] In the formula, among them, is the model value of the zenith dry delay component, is the model value of the zenith wet delay component, p is air pressure, t is temperature, e is water vapor pressure, RH is relative humidity, is the latitude, h is the elevation, the GPT model provides the temperature and air pressure in any latitude, longitude, and altitude area, and the relative humidity can use an empirical parameter of 60%;

[0058] When modeling a regional grid, the delay of the grid points must first be calculated by the reference station. The calculation methods of grid point delay include inverse distance weighting, ordinary Kriging interpolation and other algorithms. The latter has better mathematical meaning, but the calcul...

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Abstract

The invention relates to a method for acquiring area troposphere zenith delay. The method comprises the following steps of: 1) dividing a tested area into grids and setting the size and an attenuation factor of each grid; 2) acquiring the zenith total delay value of each reference station in the tested area in real time, acquiring the values of dry and wet delay according to a GPT function, computing the zenith delay modified value of each reference station; 3) computing the zenith delay modified value of each grid by using an inverse distance weighting interpolation algorithm equipped with the attenuation factor according to zenith delay modified value of all reference stations; 4) acquiring the delay modified value of a user station by using inverse distance weighting interpolation, and acquiring a user station troposphere zenith delay value; 5) and verifying the precision of the user station troposphere zenith delay value, returning to the step 1) if the precision does not satisfy a requirement or recording the user station troposphere zenith delay value if the precision satisfies the requirement. Compared with a method in the prior art, the method has advantages of full consideration, easy operation, convenient broadcast, and high precision.

Description

technical field [0001] The invention relates to the field of satellite navigation, in particular to a method for acquiring regional troposphere zenith delay. Background technique [0002] Since the GPS (Global Position System) in the United States was fully established, the Global Navigation Satellite System (GNSS, Global Navigation Satellite System) has developed rapidly and has been widely used due to its all-weather, global, real-time and high-precision characteristics. Especially in recent years, the world's major satellite navigation systems have developed particularly rapidly: the GPS system has been modernized and upgraded, and a new civilian number L2C has been added; Russia's GLONASS has added new constellations and restarted full constellation services; Europe's Galileo ( Galileo Positioning System) satellites have been newly launched; in addition, my country's BeiDou Navigation Satellite System (BDS) has also developed rapidly, and is now able to meet the high-prec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/07
CPCG01S19/07
Inventor 王君刚王解先张益泽
Owner TONGJI UNIV
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