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A method and system for estimating GNSS atmospheric refraction delay

A technology of atmospheric delay and atmospheric refraction, applied in the field of GNSS, can solve problems such as inaccuracy and complex atmospheric refraction estimation methods, and achieve the effect of improving convergence speed, solving real-time estimation problems, and simple and accurate calculation.

Active Publication Date: 2018-06-15
THE HONG KONG POLYTECHNIC UNIV
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a simple and feasible GNSS atmospheric refraction delay estimation method and system to improve the atmospheric refraction estimation method for the existing GNSS atmospheric refraction estimation method which is complex and not accurate enough. precision

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  • A method and system for estimating GNSS atmospheric refraction delay
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  • A method and system for estimating GNSS atmospheric refraction delay

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[0042] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0043] see figure 1 , is a flow chart of the GNSS atmospheric refraction delay estimation method according to a preferred embodiment of the present invention, as figure 1 As shown, the GNSS atmospheric refraction delay estimation method provided in this embodiment includes the following steps:

[0044] The invention establishes the satellite single-difference equation of the GNSS observation amount based on the equation of the linearized GNSS observation amount. Among them, the equation for linearizing GNSS observations is:

[0045] AX+M(α)V t =L=L 0 +e; (1)

[0046] In the formula, A is the coefficient matrix of the satellite, which is determined by the satellite position coordinates and the initial coordinates of the receiver. X is the posi...

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Abstract

The present invention relates to a method and system for estimating GNSS atmospheric refraction delay. The method includes the following steps: S1, taking the minimum zenith angle as the base satellite, establishing a satellite single-difference equation for GNSS observations; S2, based on the satellite single-difference The equation obtains the satellite single-difference observation equation of the second highest elevation angle and the satellite single-difference observation equation of all zenith angles greater than the preset threshold value, combines the two, and substitutes the preset atmospheric delay value and GNSS observation into Simultaneous equations solve the position vector; S3, by giving different atmospheric delay values, calculate the residual error of the satellite single-difference observation measurement equation of the second high elevation angle according to the solved position vector, and determine the atmospheric delay when the residual error is zero The value is the estimated atmospheric delay of GNSS observations at this moment. The invention solves the real-time estimation problem of atmospheric refraction, and the test proves that the estimation accuracy of atmospheric refraction error can reach 1 cm, and improves the positioning accuracy of GNSS positioning and the convergence speed of ambiguity.

Description

technical field [0001] The present invention relates to the technical field of GNSS (Global Navigation Satellite System), and more specifically, relates to a method and system for estimating GNSS atmospheric refraction delay. Background technique [0002] The carrier phase signal measurement accuracy of GNSS (Global Navigation Satellite System) can reach the order of millimeters, and atmospheric refraction is one of the main sources of error, especially the delay caused by water vapor, which is difficult to describe with a model. At present, in the high-precision GNSS positioning method, the atmospheric delay is mainly regarded as the unknown, and the atmospheric delay is directly estimated by using the GNSS carrier phase observation. But the main disadvantage of this method is that it takes a long time to estimate the atmospheric delay. This makes the GNSS real-time positioning method (RTK) restricted, and the baseline length cannot be too long. [0003] In addition, the ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/27G06F19/00
Inventor 陈武
Owner THE HONG KONG POLYTECHNIC UNIV