Broadcast-type network RTK positioning technology

Abstract

The invention provides a broadcast-type network RTK positioning technology, and the technology comprises the steps: determining a virtual reference station position through grid dividing; calculating the observation data of the virtual reference station position; enabling a data center to broadcast differential correction number information to users through a unidirectional communication network; enabling a user terminal to receive a grid table and the observation data of the corresponding virtual reference station position, reforming the RTCM format of data of VRS data, and calculating a positioning results. The technology accords with the VRS data processing principle, employs the conventional GNSS reference station facility, just carries out proper modification of data processing software and data calculating software in moving station equipment, can achieve the centimeter-level real-time positioning, and can be widely used in many industries because the technology is small in introduction investment, is high in adaptability, is good in privacy and is infinite in number of users.

Description

technical field [0001] The invention belongs to the technical field of surveying, mapping, navigation and positioning, and in particular relates to a broadcast network RTK positioning technology. Background technique [0002] The use of satellite navigation and positioning system to obtain the position information of points is the main means of basic surveying and mapping information collection and navigation and positioning. When the satellite navigation and positioning system is used for absolute positioning (or single point positioning), its accuracy is affected by many factors such as satellite orbit error, clock error, atmospheric delay error and human factors, although some of the systematic errors can be eliminated or eliminated by the model. correction, but its residual error is still not negligible. Practice has shown that the current single-point positioning accuracy can reach the meter level, while the dynamic single-point positioning accuracy is only 10m-40m, wh...

AI Technical Summary

Problems solved by technology

[0009] The main disadvantage of the existing network RTK technology is that two-way radio data transmission / reception communication is required between the data center and the mobile station. If there are many mobile stations operating at the same time, it will cause communication channel congestion and data processing delay. Therefore, it is necessary to Limit the number of simultaneous online users. Because it is a two-way communication mode, it is not convenient to use satellite communication or radio station communication (both methods require relatively high-power transmitting equipment, which is not convenient for mobile users). Currently, it is only suitable for mobile Internet Network communication mode, but due to the limited coverage of mobile Internet networks (such as mountainous areas, deserts, oceans, etc.), its application range is limited

For military users, radio signals (positioning requests) need to be sent during positioning, which is prone to radio leakage, and the approximate location information contained in the signal will expose the user's location, which is not conducive to security and confidentiality

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