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Tropospheric delay model establishing and obtaining method and device and positioning system

A tropospheric delay and model building technology, applied in the field of satellite positioning, can solve problems such as affecting the accuracy of parameter models, and achieve the effect of improving accuracy

Inactive Publication Date: 2020-05-15
QIANXUN SPATIAL INTELLIGENCE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention provides a tropospheric delay model establishment, acquisition method and device, and a positioning system, aiming to solve the problem of affecting the parameter model in the prior art due to the difference between the basis function corresponding to the non-meteorological model and the actual situation. precision problem

Method used

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  • Tropospheric delay model establishing and obtaining method and device and positioning system
  • Tropospheric delay model establishing and obtaining method and device and positioning system

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Embodiment 1

[0082] figure 1 It shows a flow chart of a method for establishing a tropospheric delay model provided by the first embodiment of the present invention, and the establishment method includes:

[0083] Step S1, obtaining tropospheric delay grid data;

[0084] Specifically, the tropospheric delay grid data is first obtained, and the grid data is the data corresponding to the basic zenith tropospheric delay grid product.

[0085] Step S2, performing elevation correction based on the tropospheric delay grid data to obtain elevation correction data;

[0086] Specifically, the elevation correction is performed on the tropospheric delay grid data to obtain the elevation correction data;

[0087] Preferably, using the formula ZTD 0 =ZTD h × exp(βh) performs elevation correction on the basic tropospheric delay grid data, where ZTD h For the underlying tropospheric delay grid data, ZTD 0 It is the elevation correction data, h is the grid point height, β=1.3137×10 -4 .

[0088] I...

Embodiment 2

[0120] Based on the first embodiment above, as Figure 4 As shown, it is a structural diagram of a device for establishing a tropospheric delay model provided by the second embodiment of the present invention. The device for establishing includes: an acquisition unit 1, an improved unit 2 connected to the acquisition unit 1, and a decomposition unit connected to the improved unit 2 3. A construction unit 4 connected to the decomposition unit 3, wherein:

[0121] Acquisition unit 1, used to obtain tropospheric delay grid data;

[0122] Specifically, the tropospheric delay grid data is first obtained, and the grid data is the data corresponding to the basic zenith tropospheric delay grid product.

[0123] The improved unit 2 is used to perform elevation correction based on the tropospheric delay grid data to obtain elevation correction data;

[0124] Specifically, the elevation correction is performed on the tropospheric delay grid data to obtain the elevation correction data;...

Embodiment 3

[0158] Based on the first embodiment above, as Figure 5 A flow chart of a tropospheric delay acquisition method provided by the third embodiment of the present invention is shown, and the acquisition method includes:

[0159] Step A1, constructing a tropospheric delay model;

[0160] Specifically, first construct a tropospheric delay model, which is based on the elevation correction of the tropospheric grid data, and is constructed after empirical orthogonal function decomposition;

[0161] Step A2, obtaining the tropospheric delay based on the constructed tropospheric delay model;

[0162] Specifically, calculate and obtain tropospheric delay data based on the constructed tropospheric delay model;

[0163] In this embodiment, the tropospheric delay model is constructed by using empirical orthogonal function decomposition, which can improve the accuracy of model construction.

[0164] Preferably, the tropospheric delay data is acquired based on the tropospheric delay model...

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Abstract

The invention is suitable for the technical field of satellite positioning, and provides a tropospheric delay model establishing and obtaining method and device and a positioning system. The establishing method comprises the steps of obtaining tropospheric delay grid data; performing elevation correction based on the tropospheric delay grid data to obtain elevation correction data; performing empirical orthogonal function decomposition on the elevation correction data to obtain a decomposition function; and performing fitting based on the decomposition function to construct a tropospheric delay model. According to the method, the tropospheric delay model is constructed by utilizing empirical orthogonal function decomposition, so that the precision of model construction can be improved.

Description

technical field [0001] The invention belongs to the technical field of satellite positioning, and in particular relates to a tropospheric delay model establishment and acquisition method and device, and a positioning system. Background technique [0002] Global Navigation Satellite System (GNSS) has been widely used in various aspects of navigation due to its many superior features, such as high precision, all-weather operation (such as continuous operation of reference stations), and low equipment cost. When the GNSS electromagnetic wave signal passes through the neutral atmosphere (mainly including the ionosphere and troposphere), it will be bent and delayed due to the influence of refraction. For the ionospheric delay, it can be corrected by the ionospheric parameters published in the almanac or eliminated by dual frequency according to the properties of the dispersive medium, so the tropospheric delay has become one of the main error sources in the neutral atmosphere. ...

Claims

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Application Information

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IPC IPC(8): G01S19/40
CPCG01S19/40
Inventor 孙浪浪
Owner QIANXUN SPATIAL INTELLIGENCE INC
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