Indoor Navigation Using WiFi and RFID Positioning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional GPS systems fail to function effectively indoors due to signal attenuation and reflections from building structures, and existing solutions for indoor navigation are limited in accuracy and reliability.
Innovation Solution
A method utilizing a portable electronic device connected to a server over a network, which generates a map and provides location information using WiFi signals, barcodes, and RFID tags to assist users in finding items within a facility, incorporating a local navigation app that determines the device's location and displays a path to selected items.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional GPS receiver is used for indoor location, then outdoor positioning capability is provided, but indoor positioning accuracy deteriorates due to signal attenuation and reflections
Solution Approach 1:
The system segments the positioning function by using different technologies for different environments: GPS for outdoor and WiFi/R RFID/barcodes for indoor. The portable device separates location determination (server-side using WiFi signals) from item identification (client-side using RFID/tags), resolving the contradiction by applying appropriate technology to each segment of the positioning task.
Solution Approach 2:
The patent introduces WiFi access points and RFID tags as intermediary elements to enable indoor positioning. These intermediaries act as reference points that the portable device can detect to determine location, bypassing the need for direct satellite signal reception and solving the indoor GPS failure problem.
2Reliability
If WiFi signals from access points are used for indoor location, then positioning capability is provided, but positioning accuracy is limited to within 2.5 meters
Solution Approach 1:
The system merges multiple positioning technologies (WiFi triangulation, RFID proximity detection, barcode recognition) to achieve better overall accuracy than any single method alone. WiFi provides coarse location (2.5m accuracy), while RFID tags and barcodes provide fine-grained item-level positioning, combining to overcome the limitations of WiFi alone.
Solution Approach 2:
The patent adds another dimension of precision by layering RFID and barcode technologies on top of the WiFi positioning framework. While WiFi operates at the room/area level, RFID and barcodes operate at the item level, creating a multi-dimensional positioning system that achieves both broad coverage and fine precision.
3Loss of information
If QR codes are used for item identification, then item information can be accessed, but the system lacks active tracking and navigation capabilities
Solution Approach 1:
The system implements self-service positioning where the portable device automatically detects RFID tags and barcodes in its vicinity without requiring manual scanning or user action. The device autonomously determines its location based on detected signals and automatically retrieves and displays relevant item information, eliminating the need for manual QR code scanning while maintaining information accessibility.
Solution Approach 2:
The system establishes a feedback loop where the portable device continuously monitors for RFID tags and barcodes, receives location information from the server, and displays navigation guidance. This closed-loop feedback system enables active tracking and automatic navigation, transforming the static QR code information system into a dynamic positioning and guidance system.
4Reliability
If RFID tags are used for item identification, then indoor and outdoor location information is provided, but the system lacks integrated navigation and path guidance
Solution Approach 1:
The portable device is designed with multi-functionality, integrating GPS receiver, WiFi transceiver, RFID reader, and barcode scanner into a single universal platform. The server also provides universal location determination that works both indoors (using WiFi) and outdoors (using GPS), enabling the system to provide consistent navigation and path guidance capabilities across all environments without requiring separate specialized devices.
Data Source
AI summary
A portable electronic device connected over a network to a server is used to guide a person using the device to one or more selected items within a facility, with the location of the device being tracked using radio frequency signals generated within the facility or GPS signals from satellites. The process of connecting to the server may be started when a bar code is photographed using a camera within the device, or when an RFID tag is read by a reader within the device. Location processes are provided for finding a vehicle left in a parking area, and for locating items that are additionally described in messages displayed on the electronic device.