GNSS atmospheric refraction delay valuation method and GNSS atmospheric refraction delay valuation system
A technology of atmospheric refraction and atmospheric delay, applied in the field of GNSS, can solve the problems of inaccuracy and complex estimation method of atmospheric refraction
Active Publication Date: 2016-06-15
THE HONG KONG POLYTECHNIC UNIV
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[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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[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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The invention relates to a GNSS atmospheric refraction delay valuation method and a GNSS atmospheric refraction delay valuation system. The method comprises the following steps: S1, establishing a satellite single-difference equation of a GNSS observation by taking the minimum zenith angle as a base satellite; S2, acquiring a satellite single-difference observation equation of the second highest elevation angle and a satellite single-difference observation equation of which all zenith angles are larger than a preset threshold according to the satellite single-difference equation, combining the two equations, and plugging preset atmospheric delay values and a GNSS observation into the simultaneous equations to solve a position vector; and S3, calculating the residual error of the satellite single-difference observation equation of the second highest elevation angle according to the solved position vector by giving different atmospheric delay values, and determining the atmospheric delay value making the residual error zero as the atmospheric delay estimated value of the GNSS observation at the moment. According to the invention, the problem of atmospheric refraction real-time estimation is solved, tests show that the valuation accuracy of atmospheric refraction error can be up to 1cm, and the precision of GNSS positioning and the convergence rate of ambiguity are improved.
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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IPC IPC(8): G01S19/27G06F19/00
Inventor 陈武
Owner THE HONG KONG POLYTECHNIC UNIV