Working Machine GNSS Correction Switching for Stable Positioning
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Solution Overview
Problem
Existing RTK positioning methods, such as RRS-GNSS and VRS-GNSS, may fail to maintain sufficient positioning accuracy due to the positional relationship between the rover and nearby base stations, leading to inconsistent performance.
Innovation Solution
An assistance device for working machines that selects and generates correction information based on satellite signals and reference points, using a selector to choose the appropriate correction information based on the positional relationship between the working machine and an area defined by a polygon connecting multiple base stations, and monitors the communication status to improve the accuracy of the working machine, and the communication status to improve the accuracy of the working machine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If RRS-GNSS or VRS-GNSS positioning methods are used, then positioning can be achieved, but positioning accuracy cannot be maintained sufficiently when the positional relationship between the rover and nearby base stations is unfavorable
Solution Approach 1:
The system dynamically switches between RRS-GNSS and VRS-GNSS positioning methods based on real-time determination of the rover's positional relationship with base stations. The determination unit continuously monitors position data and communication status, automatically selecting the appropriate positioning method to maintain accuracy under varying conditions.
Solution Approach 2:
The system changes the positioning method parameter (RRS-GNSS or VRS-GNSS) based on determined positional relationships. When the rover is in a favorable position relative to base stations, RRS-GNSS is used; when in unfavorable positions, VRS-GNSS is activated, thereby adapting the system behavior to maintain positioning accuracy.
2Ease of operation
If correction information is transmitted based on single base station, then positioning can be provided, but positioning accuracy deteriorates when the rover is far from the base station
Solution Approach 1:
The determination unit acts as an intermediary that evaluates the positional relationship between the rover and base stations, and mediates the selection between single-base-station (RRS-GNSS) and multi-base-station (VRS-GNSS) correction information transmission based on accuracy requirements.
3Measurement precision
If VRS-GNSS positioning is used, then positioning accuracy can be improved, but system complexity increases due to need for multiple base stations and virtual reference point creation
Solution Approach 1:
The system segments the positioning function into two independent modes (RRS-GNSS and VRS-GNSS), each with its own base station requirements. The determination unit divides the operational area into zones where each mode is preferable, allowing the system to use the simpler RRS-GNSS mode when possible and only activate the more complex VRS-GNSS mode when needed.
Data Source
AI summary
An assistance device for a working machine includes an acquirer to acquire, from base stations at reference points, satellite signal(s) received by the base stations, a generator to generate first correction information based on satellite signal(s) acquired by the acquirer and the reference point of one of the base stations having received the satellite signal(s), and generate second correction information including a virtual reference point based on satellite signal(s) received by three or more base stations and the reference points, a selector to select first or second correction information to be generated by the generator, and a communicator to transmit the selected first or second correction information to the working machine. The selector is configured or programmed to select the first or second correction information based on a positional relationship between the working machine and an area defined by connecting the reference points of the three or more base stations.