A method and device for modeling troposphere delay error of RTK in sea-land mixed domain

By dividing the base station and satellite path into land and sea segments, calculating the delay and correcting the difference separately, the problem of limited accuracy of RTK tropospheric delay error was solved, and higher-precision land-sea mixed domain positioning was achieved.

CN122260360APending Publication Date: 2026-06-23CHINA RAILWAY MAJOR BRIDGE RECONNAISSANCE & DESIGN INSTITUTE CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA RAILWAY MAJOR BRIDGE RECONNAISSANCE & DESIGN INSTITUTE CO LTD
Filing Date
2026-05-07
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

In existing technologies, the accuracy of RTK tropospheric delay error is limited by the assumption that the land and sea cover types are uniform. Especially in the land-sea mixed domain, it is impossible to effectively correct the uncertainty of water vapor distribution of the moisture component, resulting in a large deviation in elevation.

Method used

The oblique path between the base station and the satellite is divided into two parts: land area and sea area. The tropospheric delay of each part is obtained. The tropospheric delay of the rover is corrected by the difference between the main base station and the auxiliary base station. The delay of each path segment is calculated by using the principle of similar triangles and the global pressure-temperature model.

Benefits of technology

It improves the accuracy of RTK tropospheric delay error modeling, reduces modeling error, and enhances positioning accuracy in mixed land-sea domains.

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Abstract

The application relates to the technical field of positioning measurement, in particular to a sea-land mixed domain RTK troposphere delay error modeling method and device. The method comprises the following steps: dividing the slant path between the reference stations in the sea-land mixed area and the same satellite into a land slant path section and a sea slant path section; obtaining the troposphere delay of the land slant path section and the troposphere delay of the sea slant path section based on the real-time data flow of each reference station to the satellite; selecting a main reference station, and taking other reference stations as auxiliary reference stations; determining the sea slant path section troposphere delay difference and the land slant path section troposphere delay difference of the main reference station and each auxiliary reference station based on the sea slant path section troposphere delay and the land slant path section troposphere delay of the main reference station and each auxiliary reference station; and determining the inter-station slant troposphere delay between the rover station and the main reference station based on the land slant path section troposphere delay difference and the sea slant path section troposphere delay difference of the main reference station and each auxiliary reference station and the positions of the rover station and the main reference station. The method can solve the problem that the modeling precision of the RTK troposphere delay is limited in the prior art.
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