FKP calculation method for high-precision positioning CORS network in large height difference region

Abstract

The invention discloses an FKP calculation method for a high-precision positioning CORS network in a large height difference region. The method comprises the following steps: step 1, acquiring GNSS observation data and meteorological observation data of a CORS station; step 2, calculating a troposphere total delay correction number of each CORS station; step 3, calculating a wet delay correction number of each station; step 4, obtaining a PWV value of each CORS station; step 5, acquiring an atmospheric precipitable water PWV random domain model; step 6, performing three-dimensional grid subdivision on the three-dimensional space area covered by the CORS station; step 7, calculating a PWV value with an elevation attribute at the virtual grid point; step 8, broadcasting a grid virtual troposphere wet delay correction number; step 9, calculating an accurate troposphere error correction number at the monitoring station; step 10, calculating other accurate error corrections of the monitoring station; and step 11, calculating an accurate coordinate. The problem that in the prior art, network RTK user ambiguity cannot be fixed in a large height difference area, or positioning precision is too low is solved.

Description

technical field [0001] The invention relates to a high-precision positioning CORS network FKP solution method in a large elevation difference area, and belongs to the technical field of network RTK. Background technique [0002] The basic principle of network RTK (Real-time kinematic, real-time dynamic measurement technology) is to arrange multiple reference stations sparsely and evenly in a large area to form a network of reference stations, and calculate GNSS based on the data of these reference stations. (Global Navigation Satellite System, Global Navigation Satellite System) corrects the information and broadcasts it to users, thereby providing real-time centimeter-level positioning services for network RTK users in the area. [0003] Network RTK is composed of base station network, data processing center and data communication lines. The base station should be equipped with a dual-frequency full-wavelength GNSS receiver, which can simultaneously provide accurate dual-f...

AI Technical Summary

Problems solved by technology

[0004] Along the Sichuan-Tibet Railway, when using the existing network RTK for positioning, it often occurs that the network RTK user ambiguity cannot be fixed, or the positioning accuracy is too low. After further testing, it is found that the existing network RTK This problem is common in poor areas

[0005] When solving the problem of low positioning accuracy in areas with large elevation differences, an invention patent with the patent number CN202010892977.4 is proposed in the prior art, which discloses an RTK algorithm for correcting the tropospheric empirical model with measured meteorological parameters. The problem of low positioning accuracy under height difference, but this algorithm is only suitable for ordinary RTK, not for network RTK

[0006] At present, there is no method to solve the problem that network RTK cannot fix the ambiguity of network users in areas with large elevation differences, or the accuracy of positioning calculation is too low. Therefore, a CORS network calculation method in areas with large elevation differences is proposed to solve The network RTK ambiguity cannot be fixed in areas with large elevation differences, or the positioning accuracy is too low

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