Indoor Wireless Positioning Using Floor and Wall Loss Compensation
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Solution Overview
Problem
Existing indoor wireless positioning systems face challenges in accurately determining the position of a user terminal within a multi-floor building due to varying signal strength caused by obstacles like walls and floors, leading to inaccurate positioning.
Innovation Solution
The system calculates floor loss information by comparing received signal strength (RSS) from different floors and pre-stored previous floor loss information, and then uses this data to determine the user's location by finding the minimum Euclidean distance value, while also accounting for wall loss to estimate position coordinates on a horizontal plane using a triangulation technique.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If signal strength (RSS) is used to estimate position, then positioning can be performed, but accuracy deteriorates due to sensitive variation by indoor obstacles such as walls and floors
Solution Approach 1:
The patent segments the signal attenuation problem into two distinct components: floor loss and wall loss. By calculating floor loss information separately for each floor and then determining wall loss based on the difference between actual RSS and expected RSS (without walls), the system isolates and compensates for each obstacle type's effect independently, thereby improving positioning accuracy despite the presence of obstacles
Solution Approach 2:
The patent changes the parameter estimation approach by introducing floor loss information as an intermediate parameter. Instead of directly using RSS for position estimation, the system first calculates floor loss based on vertical distance and floor characteristics, then derives wall loss by comparing actual RSS with expected RSS after floor loss compensation. This multi-stage parameter transformation improves measurement precision
2Measurement precision
If simple RSS-based positioning is used, then the system is simple to operate, but positioning accuracy deteriorates in multi-floor buildings with obstacles
Solution Approach 1:
The patent performs preliminary calculation of floor loss information for each floor before final position determination. By pre-calculating the vertical attenuation component and storing floor loss characteristics, the system reduces the complexity of the main positioning calculation, as wall loss can then be determined through a straightforward comparison with actual RSS measurements
Solution Approach 2:
The system uses feedback by comparing actual RSS measurements with expected RSS values (after floor loss compensation) to determine wall loss. This feedback mechanism allows the system to adapt to actual environmental conditions and refine position estimates, improving accuracy without requiring overly complex pre-programming
Data Source
AI summary
Provided are an indoor wireless positioning system and method capable of more accurately performing indoor wireless positioning by predicting signal attenuation due to a floor or wall within a multi-floor building. The indoor wireless positioning method includes calculating floor loss information of a floor on which the user terminal is located within the building, a higher floor, and a lower floor, calculating the floor on which the user terminal is located by comparing the calculated floor loss information to pre-stored previous floor loss information, calculating information about wall loss in the floor on which the user terminal is located, and acquiring position information on a horizontal plane of the user terminal according to received signal strength of the user terminal and the information about the wall loss. When the position of the user terminal is detected, detection accuracy is improved and more efficient wireless positioning is possible.