Intelligent Transportation Systems Can Detect Vehicle Position with RFID Tags
Radio Frequency Identification (RFID) presents a robust approach for determining vehicle position. By installing radio frequency identification tags encoded with road name, specific lane, direction of travel, and distance from a known reference, vehicles traveling with RFID readers can determine precise position. Vehicle units communicate with sensors and actuators in other vehicles to update position between adjacent tags. RFID tags can be inexpensively used in numerous intelligent transportation systems and have the potential to enable bus location automation, high occupancy tolling lanes, rear-end crash prevention, in-vehicle signing, and vehicle navigation without global positioning systems (GPS). RFID tags are advantageous for intelligent transportation systems by controlling traffic and turn lane signals, facilitating passage of emergency vehicles, and determining distance traveled on tollways to calculate the appropriate toll.
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Vehicle Positioning Systems Extend GPS Capabilities for Vehicle Navigation
Vehicle Positioning Systems complement and extend the capability GPS devices by removing the reliance on satellite signals. One of the main faults of GPS systems is the requirement for direct line-of-sight signal paths to three satellite signals at all times. Traveling in urban areas, signals are easily corrupted by tall buildings, bridges, and traffic congestion. Removing problems associated with temporary signal loss of GPS systems, the Vehicle Positioning System enables many transit applications including headway control of bus platoons, lane change assistance, rear-end collision avoidance, and bay mark-up applications. The Vehicle Positioning System allows vehicle navigation to continue in places where GPS signals are unreliable.
FEATURES OF VEHICLE POSITIONING SYSTEMS WITH RFID
- Accurate--RFID tags in road lanes and other vehicles communicate with the Vehicle Postioning System to accurately communicate precise vehicle position.
- Reliable--unlike GPS devices, the Vehicle Positioning System removes satellite outages due to signal corruption/obstruction and provides continuous vehicle navigation.
- Inexpensive-- robust, novel, affordable approach for intelligent transportation systems.
- Robust Vehicle Positioning System-- ability to control traffic and turn lane signals, facilitate the passage of emergency vehicles, and determine distance traveled on tollways.