Access Point Orientation Error Compensation for Indoor Location Accuracy
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Solution Overview
Problem
Inaccurate location estimation of wireless mobile devices in indoor structures due to misalignment of wireless access points' installation orientation with the predefined area's reference orientation, leading to decreased accuracy of location-based services.
Innovation Solution
A system that computes orientation errors of access points by using angle of arrival estimates and peak-to-average power ratios to adjust their orientations computationally, ensuring alignment with the predefined area's orientation, thereby improving location estimation accuracy without physical adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If access points are installed in predefined areas to assist location estimation, then location estimation accuracy is improved, but orientation misalignment between access points and predefined area causes measurement precision to deteriorate
Solution Approach 1:
The system performs preliminary orientation error computation and adjustment before location estimation. By calculating the orientation error between access points and predefined area boundaries in advance, and adjusting the access point orientations computationally, the system prepares corrected orientation data that eliminates the misalignment issue before it affects location measurements
Solution Approach 2:
The system changes the orientation parameter of access points computationally by calculating orientation errors and applying adjustments. This parameter transformation converts misaligned access point orientations into aligned orientations relative to the predefined area, thereby improving location estimation accuracy without physical reinstallation
2Measurement precision
If computational orientation adjustment is performed, then location estimation accuracy is significantly improved, but system complexity increases due to additional computation steps
Solution Approach 1:
The system uses feedback from angle of arrival measurements to compute orientation errors and adjust access point orientations. By continuously measuring angles of arrival from mobile devices, calculating the discrepancy between expected and actual orientations, and applying corrective adjustments, the system creates a closed-loop feedback mechanism that automatically maintains accurate orientation alignment
Solution Approach 2:
The system performs self-adjustment by automatically computing its own orientation errors using angle of arrival data and correcting its orientation parameters. The access points essentially self-correct their orientations without external intervention, using the existing angle of arrival measurements and predefined area information to autonomously improve their alignment
Data Source
AI summary
A method for adjusting an installation orientation of an access point within a predefined area with an associated orientation is disclosed. The method includes obtaining, at a computing apparatus, angle of arrival estimates from each access point based on a wireless transmission from a wireless mobile device. The computing device generates an estimated location of the wireless mobile device based on the angle of arrival estimates. Next, the computing device determines an orientation error for each wireless access point based on the angle of arrival estimate of the wireless mobile device and the estimated location of the wireless mobile device. The computing device generates an adjusted orientation of one or more of the access points based on the orientation error of the access point, thereby aligning the adjusted orientation with the orientation of the predefined area.