Vehicle Position Recognition Using WiFi RSSI Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing location-based services struggle to accurately determine the position of a vehicle in indoor underground parking lots where GPS communication is unavailable, due to errors in WiFi received signal strength indicator (RSSI) measurements and the need for continuous GPS and WiFi module activation.
Innovation Solution
A vehicle position recognizing apparatus and method using a WiFi module to measure RSSI values from WiFi access points, a WPS module to estimate the vehicle's position, and a WPS correction controller to correct these values based on antenna beam pattern data, enabling accurate position recognition by transmitting corrected parking position information to a smartphone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GPS modules are installed to provide positioning information, then positioning capability is improved, but positioning becomes difficult in indoor environments due to straight propagation requirements of electric waves
Solution Approach 1:
The patent introduces WiFi access points as intermediary objects to enable positioning in indoor environments. Instead of relying on GPS satellites, the system uses WiFi signals from access points as mediators to calculate position based on signal strength, thereby adapting positioning capability to indoor settings where GPS is unavailable.
Solution Approach 2:
The patent replaces the GPS-based positioning mechanism with a WiFi-based positioning mechanism. By substituting the electromagnetic wave propagation requirements of GPS with WiFi signal strength measurement, the system achieves positioning functionality in indoor environments where GPS cannot operate.
2Adaptability or versatility
If WPS is used for indoor positioning, then indoor positioning capability is improved, but measurement precision deteriorates due to errors in RSSI measurement in iron-framed vehicles
Solution Approach 1:
The patent implements a feedback mechanism by measuring the actual RSSI values from WiFi access points and using these measurements to calculate and refine position estimates. The system continuously monitors signal strength and adjusts positioning calculations based on the measured feedback, improving accuracy despite the challenging iron-framed vehicle environment.
Solution Approach 2:
The patent changes the measurement parameter from raw RSSI values to corrected position coordinates. By transforming the RSSI measurements into position information and using multiple access point measurements to triangulate position, the system overcomes the precision limitations of individual RSSI readings in iron-framed vehicles.
3Reliability
If GPS and WiFi modules are kept turned on for position tracking, then positioning availability is improved, but energy consumption increases
Solution Approach 1:
The patent implements periodic positioning updates rather than continuous operation. The system activates the WiFi module to measure RSSI values and calculate position only when positioning is needed, rather than continuously monitoring, thereby reducing energy consumption while maintaining positioning availability when required.
Solution Approach 2:
The patent enables the positioning system to automatically activate and deactivate based on operational needs. The system self-manages module activation, turning on GPS or WiFi modules only when positioning functionality is required and turning them off when not needed, eliminating the need for manual user intervention and reducing unnecessary energy consumption.
Data Source
AI summary
The present invention relates to an apparatus and method for recognizing a position of a vehicle to notify the position to a driver. The vehicle position recognizing apparatus includes a WiFi module configured to receive signals from a plurality of WiFi APs, a WPS module configured to measure RSSI values of the signals received by the WiFi module, and estimate a position of a vehicle, and a WPS correction controller configured to correct the RSSI values measured by the WPS module to recognize the position of the vehicle.