WLAN Location Measuring Using GPS Correction and Barycentric Coordinates
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Solution Overview
Problem
Existing location measuring techniques, such as GPS-based methods, are limited in precision and usability within enclosed spaces like buildings, as they require satellite signals and cannot accurately measure terminal locations using access points for WLAN services.
Innovation Solution
A method and apparatus that utilize access points for WLAN services to measure terminal locations by storing access point coordinates, receiving GPS information, calculating terminal locations, and correcting them using a correction ratio based on the number of access points and signal strengths, employing barycentric coordinates for improved precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GPS-based location measuring technique is used, then location measurement is possible in open spaces, but it cannot measure location accurately within buildings where satellite signals cannot be received
Solution Approach 1:
The patent introduces WLAN access points as intermediary objects to enable location measurement indoors. Instead of directly using GPS satellites which cannot penetrate buildings, the system uses locally deployed access points as mediators that can be received inside buildings, thereby enabling location measurement in enclosed spaces where GPS fails
Solution Approach 2:
The patent replaces the GPS satellite-based electromagnetic signal system with a WLAN-based electromagnetic signal system for indoor location measurement. By substituting the measurement mechanism from satellite signals to access point signals, the system achieves functionality in environments where the original system fails
2Adaptability or versatility
If access point-based location measuring is used, then location can be measured within buildings, but measurement precision is lower compared to GPS
Solution Approach 1:
The patent merges GPS-based location measurement and WLAN access point-based location measurement into a unified system. By combining both measurement approaches and using them together with complementary weighting, the system achieves both the indoor applicability of WLAN and the high precision of GPS
Solution Approach 2:
The patent dynamically changes the weighting parameters between GPS and WLAN measurements based on signal conditions. When GPS signal quality is high, it receives higher weight; when WLAN measurements are performed indoors, their weight is adjusted accordingly. This parameter adjustment optimizes overall measurement precision while maintaining adaptability
3Measurement precision
If correction ratio is increased to improve precision, then location accuracy improves, but the system becomes more complex
Solution Approach 1:
The patent applies partial correction by using a correction ratio that partially adjusts the initial location measurement rather than completely replacing it. This partial action approach improves precision through correction while avoiding the full complexity of complete recalibration systems
Data Source
AI summary
Measuring a location of a communication terminal using a wireless local area network access point based on location coordinates of the access points and global positioning system (GPS) location information of the communication terminal.