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Real-time high-precision global multi-dimensional troposphere zenith delay grid model construction method

A construction method and high-precision technology, which can be used in special data processing applications, design optimization/simulation, etc., and can solve problems such as single data source and insufficient spatial resolution.

Active Publication Date: 2020-08-14
GUILIN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0004] Through the above analysis, the existing problems and defects of the existing technology are: (1) the spatial resolution of the vertical profile model of the troposphere is not fine enough; (2) the model construction uses a single data source

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Embodiment 1

[0123] (1) Data source introduction and processing. The data sources involved in the model construction of the present invention are: the latest ERA5 data provided by the ECMWF Center, the grid ZTD data provided by the GGOS Atmospheric Center and its corresponding grid surface elevation, the ZTD products provided by the IGS Center and the GNSS data provided by the CORS network. The horizontal resolution of the ERA5 reanalysis data is 0.25°×0.25°, the time resolution is 1h, and the vertical resolution is 37 isobaric layers; the horizontal resolution of the GGOS atmospheric grid ZTD product is 2.5°×2° (longitude *latitude), the time resolution is 6h; the IGS Center provides ZTD products of thousands of GNSS reference stations around the world, the time resolution is 5min, and the accuracy is better than 5mm; for the GNSS reference station data provided by the CORS network, the Bernese The precision GNSS processing software calculates the ZTD information of each GNSS reference st...

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Abstract

The invention belongs to the technical field of satellite navigation positioning system data processing and meteorology crossing and discloses a real-time high-precision global multi-dimensional troposphere zenith delay grid model construction method. A sliding window algorithm is introduced to divide the whole world into 5-degree * 4-degree regular windows, ERA5 data are utilized to construct a ZTD vertical section model considering fine seasonal changes of ZTD elevation scaling factors in all the windows of the whole world, and then a 5-degree * 4-degree global ZTD vertical section grid model is constructed. According to the method, multi-dimensional ZTD model parameters at the average elevation of all windows in the world serve as parameters of geometric centers of the windows and are stored in the form of grid points, a new global grid is built according to a sliding window algorithm, and a real-time high-precision global multi-dimensional ZTD grid model suitable for any height isbuilt. According to the real-time high-precision global multi-dimensional ZTD grid model established by the invention, the calculation efficiency of the model is well improved, and the practicabilityof the model is enhanced.

Description

technical field [0001] The invention belongs to the interdisciplinary technical field of global navigation satellite system (GNSS) data processing and meteorology, and in particular relates to a real-time high-precision global multi-dimensional tropospheric zenith delay grid model construction method. Background technique [0002] At present, tropospheric delay is a key factor affecting high-precision navigation and positioning of space technologies such as Global Navigation Satellite System (GNSS) and Very Long Baseline Interferometry (VLBI), and it is also the basic data of atmospheric science research. At present, the tropospheric delay model is mainly used to provide tropospheric delay information. Traditional tropospheric delay models are mainly divided into two categories, one is the model that requires meteorological parameters, and the other is the model without meteorological parameters. Tropospheric delay models that require measured meteorological parameters have...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20
CPCG06F30/20
Inventor 黄良珂彭华刘立龙黎峻宇康传利谢劭峰
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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