RTK positioning method and system of cellular network

Abstract

The invention discloses a RTK positioning method of a cellular network. The method comprises the following steps: selecting a fixed reference station, setting a standard coordinate, acquiring observation data and sending to a centralized control center, wherein the centralized control center distributes a reference station scheduling center corresponding to the fixed reference station; the fixed reference station computes pseudo-range residual and carrier phase residual and sends the same to the reference station scheduling center; a mobile station coarsely positions itself and transmits the positioning result to the centralized control center; the centralized control center distributes the reference station scheduling center corresponding to the mobile station; the reference station scheduling center matches the reference station corresponding to the mobile station, and sends the matched reference station to the mobile station; the mobile station receives the reference station data; and the mobile station positions in high precision. The invention further provides a system for positioning by use of the position method. The system comprises the centralized control center, the plurality of reference station scheduling centers, the fixed reference station, the mobile station and the communication link. The positioning method disclosed by the invention is fast in positioning speed, high in precision, low in cost and small in data processing pressure.

Description

technical field [0001] The invention specifically relates to a cellular network RTK positioning method and system. Background technique [0002] In recent years, the application of high-precision satellite positioning and navigation systems has extended from the traditional surveying and mapping field to driving test, intelligent control, unmanned driving, unmanned aerial vehicles, remote sensing and other fields, resulting in the number of high-precision satellite navigation terminals (rovers) is increasing. The increasing number of high-precision satellite positioning and navigation applications and positioning terminals makes the demand for high-precision network RTK technology more and more obvious. [0003] RTK (Real Time Kinematic) technology is a real-time dynamic positioning technology based on carrier phase difference. It is based on real-time processing of carrier phase observations of two stations, and provides 3D positioning results in the specified coordinate s...

AI Technical Summary

Problems solved by technology

In some remote areas, there is no mobile communication network for the time being or when the communication rate cannot meet the transmission rate requirements of RTK observation data, the network RTK technology cannot be used

(2) Secondly, because the network RTK technology mainly proposes solutions to the problems of long-baseline RTK, the network RTK technology cannot be realized by means of short-distance radio stations, and can only be realized through wired networks, wireless cellular networks or wireless local area networks. The observation information of the reference station is aggregated to the network RTK data center through the Internet network. There is a certain transmission delay and processing delay in the observation data, which has certain limitations for high-precision positioning in a dynamic environment.

(3) Then, the network RTK technology needs to build a large number of reference stations (also called CORS stations), the construction cost of CORS stations is extremely high, and CORS stations need to pay a lot of maintenance costs every year

Moreover, the complexity of the network RTK technology algorithm and the virtual reference observation value increase with the increase of the number of rover stations, which in turn brings great burden and pressure to the data center server processing and communication network transmission

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