Aligning Indoor Maps with QR Code Reference Tags
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Solution Overview
Problem
Indoor positioning technologies face challenges in accurately associating altitude layers of a radiomap with the correct floor of a building, leading to incorrect floor displays and reduced horizontal positioning accuracy, especially in multi-floor structures.
Innovation Solution
A method involving a mobile device obtaining a reference position from a QR Code or similar tag, which includes relative and absolute altitude information, to accurately align indoor maps with radiomap data, enhancing floor detection and horizontal positioning accuracy by associating the reference position with identification information of wireless access points and radiomap data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If radiomap data is used for indoor positioning, then positioning capability is provided, but accurate association between altitude layers and building floors cannot be achieved
Solution Approach 1:
The patent introduces reference tags as intermediary elements placed at known positions on building floors. These tags contain identification information that serves as a mediator between the radiomap positioning system and the indoor map representation, enabling accurate association between altitude layers and floors without requiring direct integration of the two systems.
Solution Approach 2:
The system uses reference tags with known positions to provide feedback for alignment. By comparing the position of reference tags in the radiomap with their actual positions on the indoor map, the system can determine transformation parameters that feedback-correct the alignment between the two coordinate systems, ensuring accurate floor detection.
2Measurement precision
If radiomap data is used for indoor positioning, then positioning capability is provided, but horizontal positioning accuracy is reduced
Solution Approach 1:
Reference tags act as intermediary calibration points that bridge the radiomap and indoor map coordinate systems. By placing tags at precisely known horizontal positions on floors, the system can accurately determine the spatial relationship between the two maps, correcting horizontal alignment errors.
Solution Approach 2:
The system determines transformation parameters (translation and rotation) that adjust the radiomap coordinate system to match the indoor map coordinate system. These parameter changes enable accurate horizontal positioning by compensating for misalignment between the two reference frames.
3Measurement precision
If multiple altitude layers are created for multi-floor buildings, then vertical positioning is improved, but incorrect floor display occurs
Solution Approach 1:
Reference tags provide feedback signals that indicate which floor an altitude layer corresponds to. By associating the known floor level of reference tags with their positions in the radiomap, the system can reliably link altitude layers to correct floors, preventing incorrect floor display even when multiple floors are present.
Solution Approach 2:
Reference tags serve as intermediary markers that mediate between vertical positioning data from the radiomap and floor identification. The tags contain floor level information that bridges the gap between altitude measurements and floor representations, ensuring correct association.
Data Source
AI summary
A method includes obtaining or causing obtaining a reference position of the at least one apparatus based on at least one reference tag located at a predefined position of a map represented by map data of at least part of a structure. The method also includes obtaining or causing obtaining identification information of at least one first wireless access point based on a radio signal of the at least one first wireless access point. The method further includes associating or causing associating a first position determined based on the reference position with at least one of: a position estimate determined based on the identification information of the at least one first wireless access point and a radiomap represented by radiomap data of at least part of a structure; of the identification information of the at least one first wireless access point. A corresponding apparatus is also disclosed.