Garden Tool Positioning in GNSS-Shadowed Areas Using Target Markers
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Solution Overview
Problem
Garden tools like robotic mowers face challenges in maintaining accurate positioning when entering satellite navigation shadowed areas due to obstructions, leading to unreliable satellite signal reception.
Innovation Solution
The implementation of a control method and system for garden tools that involves creating a working area map with marked satellite navigation shadowed areas, arranging target markers within these areas, and using an identification scanning module to identify these markers for precise positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If satellite navigation positioning is used for garden tools, then positioning accuracy is improved in open areas, but positioning reliability deteriorates in satellite navigation shadowed areas
Solution Approach 1:
The working area is segmented into multiple zones: satellite navigation shadowed areas and non-shadowed areas. Different positioning methods are applied to different zones - target marker identification in shadowed areas and satellite navigation in non-shadowed areas, resolving the contradiction between accuracy and reliability across different spatial regions
Solution Approach 2:
Target markers are introduced as intermediary objects in satellite navigation shadowed areas. These markers serve as mediators between the positioning system and the environment, enabling the garden tool to achieve positioning in areas where satellite signals are blocked by transmitting visual identification information that the identification scanning module can detect
2Reliability
If target markers are arranged in satellite navigation shadowed areas, then positioning reliability is improved, but device complexity increases
Solution Approach 1:
Instead of equipping the garden tool with complex active sensing devices to detect obstacles and create positioning references, the system uses passive target markers that are visually copied/recognized by the identification scanning module. This reduces the complexity of the positioning system while maintaining reliability in shadowed areas
Solution Approach 2:
The identification scanning module serves multiple functions: it identifies target markers for positioning in shadowed areas and can also identify obstacles for navigation safety. This multi-functionality reduces the need for separate specialized devices, thereby reducing overall system complexity
Data Source
AI summary
A control method of a garden tool includes arranging a target marker as a positioning marker in a satellite navigation shadowed area in a working area of the garden tool, the garden tool is positioned based on a satellite navigation signal and a working area map in an area with reliable satellite signals outside the satellite navigation shadowed area. In the satellite navigation shadowed area, the garden tool is positioned through identifying the target marker in the satellite navigation shadowed area by an identification scanning module, thereby improving working efficiency of the garden tool in the satellite navigation shadowed area.