Real-time network RTK positioning method compatible with quasi-geoid model

Abstract

The invention discloses a real-time network RTK (Real-Time Kinematic) positioning method compatible with a quasi-geoid model. First, the approximate position of a user mobile station is obtained according to the longitude, latitude and geodetic height provided by GGA, and the elevation anomaly and normal elevation of the approximate position of the user are calculated by using the quasi-geoid griddata and an elevation anomaly interpolation function in a data processing center according to the geodetic coordinates B and L of the approximate position of the user. Then, the coordinate differencecaused by elevation anomaly correction is subtracted from the coordinates of a virtual reference station and the result is sent to the user mobile station, and the user mobile station carries out RTKrelative positioning to obtain geodetic coordinates including the normal elevation. By making full use of a CORS system and a high-precision quasi-geoid model, the user mobile station can obtain high-precision geodetic coordinates including the normal elevation in real time, the engineering efficiency is improved, and the workload is reduced.

Description

technical field [0001] The invention relates to a multi-system fusion navigation and positioning technology, in particular to a real-time network RTK positioning method compatible with a geoid-like model, and belongs to the technical field of GNSS (Global Navigation Satellite System) positioning and navigation. Background technique [0002] The distance from the ground point along the plumb line to the quasi-geoid is called the normal height, and the quasi-geoid model is generally fitted by reliable data obtained by high-precision GPS measurement and leveling. General network RTK (establish multiple GPS reference stations in an area, form a mesh coverage for the area, and calculate and broadcast GPS correction information based on one or more of these reference stations, so that The real-time correction positioning method used by GPS users is called GPS network RTK) measurement. Due to the lack of quasi-geoid model, users can only get the geodetic height instead of the norma...

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Problems solved by technology

General network RTK (establish multiple GPS reference stations in an area, form a mesh coverage of the area, and calculate and broadcast GPS correction information based on one or more of these reference stations, so as to The real-time correction positioning method used by GPS users is called GPS network RTK) measurement, due to the lack of quasi-geoid model, users can only get the geodetic height instead of the normal height used in production practice

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