Broadcast Assistance Data for RTK Positioning
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Solution Overview
Problem
The existing RTK positioning technology faces security risks and efficiency issues due to the need for terminal devices to report GPS location information and the unicast transmission of correction data, which affects precision and battery life in applications like unmanned aerial vehicles and smart driving.
Innovation Solution
A method where a network device receives assistance data from a positioning data center and broadcasts it to terminal devices, eliminating the need for location information reporting from terminals and improving efficiency through segmented data transmission based on transport block sizes, enhancing security and battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If terminal devices report GPS location information to RTK server in unicast manner, then positioning precision can be improved, but security risks increase and transmission efficiency decreases
Solution Approach 1:
The assistance data is segmented into multiple transport blocks for transmission. Each transport block contains a portion of the assistance data along with segmentation information, allowing the network device to broadcast segmented data efficiently while maintaining security and enabling terminal devices to reconstruct the complete assistance data for high-precision positioning.
2Measurement precision
If RTK server transmits correction data in unicast manner, then positioning precision can be improved, but transmission efficiency decreases
Solution Approach 1:
The network device broadcasts assistance data to multiple terminal devices simultaneously in a many-to-one manner, merging the transmission process into a single efficient operation. This eliminates the need for separate unicast transmissions to each terminal device, significantly improving transmission efficiency while maintaining positioning precision through the segmented transport block structure.
3Measurement precision
If terminal devices continuously report location information and receive correction data, then positioning precision is maintained, but energy consumption increases
Solution Approach 1:
The network device broadcasts assistance data periodically through system information blocks, and terminal devices receive this data at predetermined intervals rather than continuously. This periodic transmission approach maintains positioning precision by ensuring terminals have current assistance data while significantly reducing energy consumption compared to continuous transmission and reception operations.
Data Source
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AI summary
An assistance data transmission method, a device, and a system are provided, to resolve a security risk problem and a relatively low efficiency problem that are caused because a terminal device needs to report GPS location information of the terminal device in an existing RTK positioning technology. The method includes: obtaining, by a network device, assistance data from a positioning data center; and sending the assistance data to a terminal device in a broadcast manner, where the assistance data is data used by the terminal device to perform positioning. The assistance data is broadcast to the terminal device in the broadcast manner, to avoid that the terminal device reports GPS location information of the terminal device, thereby improving security and improving efficiency.