Residual correction method for NWP inversion tropospheric delay under multi-factor constraints

A tropospheric delay and multi-factor technology, applied in satellite radio beacon positioning systems, measuring devices, instruments, etc., can solve problems such as poor tropospheric delay accuracy, achieve the effects of improving positioning accuracy, shortening convergence time, and wide application range

Active Publication Date: 2019-06-21
SHANDONG UNIV OF SCI & TECH
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is, in order to overcome the deficiencies in the prior art, provide a kind of NWP inversion tropospheric delay residual error correction method under multi-factor constraints, used to solve the problem of poor tropospheric delay accuracy obtained by the existing method technical problem

Method used

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  • Residual correction method for NWP inversion tropospheric delay under multi-factor constraints
  • Residual correction method for NWP inversion tropospheric delay under multi-factor constraints
  • Residual correction method for NWP inversion tropospheric delay under multi-factor constraints

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Embodiment 1

[0037] The first step is to obtain the ZTD of SCIP station and ROCK station in 2015 from the IGS MGEX network, record it as IGS_ZTD, and eliminate gross errors.

[0038] In the second step, in the ERA-Interim (Jan1979-present) product of the reanalysis data of the European Center for Mesoscale Weather Forecasting (ECMWF), obtain a plane resolution of 0.125°×0.125°, a vertical resolution of 37 layers, and a time resolution of It is the 6-hour layered meteorological data of SCIP station and ROCK station area in 2015. The meteorological data includes air pressure, temperature, relative humidity and geopotential height.

[0039] The third step is to use the integration method to invert the regional meteorological data of the SCIP station to obtain the ZTD of the SCIP station in 2015, which is recorded as NWP_ZTD. The calculation formula of ZTD inversion by layered integration method is:

[0040]

[0041] where ZTD grid is the ZTD value of the grid point at the height of the m...

Embodiment 2

[0055] The first step is to obtain the ZTD of PIN1 station and ROCK station for consecutive years in 2015 from the IGS MGEX network, record it as IGS_ZTD, and eliminate gross errors.

[0056] In the second step, in the ERA-Interim (Jan1979-present) product of the reanalysis data of the European Center for Mesoscale Weather Forecasting (ECMWF), obtain a plane resolution of 0.125°×0.125°, a vertical resolution of 37 layers, and a time resolution of It is the 6-hour layered meteorological data of PIN1 station and ROCK station area in 2015. The meteorological data includes air pressure, temperature, relative humidity and geopotential height.

[0057] The third step is to use the integration method to invert the regional meteorological data of the PIN1 station to obtain the ZTD of the SCIP station in 2015, which is recorded as NWP_ZTD. The calculation formula of ZTD inversion by layered integration method is:

[0058]

[0059] In the above formula: ZTD grid is the ZTD value of...

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Abstract

The invention discloses a residual correction method for NWP inversion tropospheric delay under multi-factor constraints. The method comprises steps: continuous one-year ZTD of all continuous runningreference stations in a working area and continuous one-year re-analysis data provided by the NWP in the area are firstly acquired; the ZTD of all continuous running reference stations in the area areinverted by using an integral method; the NWP inversion ZTD residual is fit based on a polynomial fitting method based on the minimum absolute residual method, and NWP prediction data and the initialcoordinates of an observation station at the current moment are acquired; by using the above residual model, the NWP_ZTD residual after correction at the current moment is calculated; the initial value of the NWP_ZTD at the current moment is inverted by using the NWP prediction data at the current moment; the initial value of the above NWP_ZTD and the NWP_ZTD residual after correction are added,and the accurate NWP_ZTD at the current moment is obtained. The method performs modeling for the first time based on the relationship between temperature, humidity, position and other factors and a tropospheric residual time sequence, the NWP inversion tropospheric delay residual is improved to improve the tropospheric delay estimation precision to a sub-centimeter level.

Description

technical field [0001] The present invention relates to a residual error correction method of tropospheric delay, especially the residual correction method of NWP inversion tropospheric delay under multi-factor constraints, which uses the change law of the time series of various meteorological factors to model and correct the numerical weather prediction model ( The residual of the tropospheric delay retrieved by NWP), thereby improving the convergence speed and positioning accuracy of precise point positioning (PPP) and long-distance baseline real-time precise kinematic positioning (RTK), which belongs to the field of global satellite navigation and positioning technology. Background technique [0002] Tropospheric delay is one of the main error sources for Global Navigation Satellite System (GNSS) navigation and positioning, and its influence on electromagnetic wave signals is non-dispersive refraction. Due to the influence of tropospheric refraction, the propagation path ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/08G01S19/42
Inventor 李雷徐莹闫俐孜刘国林刘凡
Owner SHANDONG UNIV OF SCI & TECH
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