Smartphone Toll Transponders for Accurate Lane Tracking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vehicle tracking systems face challenges in accurately determining the roadway lane in which a vehicle is traveling, particularly in open road tolling systems with multiple transponder detection antennas, which is crucial for preventing double counting and enforcing lane-specific tolls and traffic management rules.
Innovation Solution
Utilizing smartphones as active transponders, equipped with Bluetooth Low Energy (BLE) and WiFi capabilities, to communicate with roadside transceivers equipped with multi-beam antennas and BLE beacons, leveraging Received Signal Strength Indication (RSSI) to determine the vehicle's lane of travel through algorithms that analyze signal strength patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple transponder detection antennas are deployed to cover multiple lanes, then lane coverage is improved, but the accuracy of determining which lane a vehicle is traveling in deteriorates due to signal ambiguity and multipath interference
Solution Approach 1:
The system segments the toll monitoring function into multiple specialized components: Bluetooth transceivers for device detection, multi-beam antennas for spatial signal separation, RSSI measurement units for signal strength analysis, and algorithms for lane determination. Each component handles a specific aspect of the detection process, improving overall accuracy despite multiple antennas operating in parallel.
Solution Approach 2:
The patent introduces smartphone Bluetooth transceivers as intermediary devices that actively cooperate with the toll system. These transponders provide unique device identifiers and participate in signal strength measurements, serving as mediators between the vehicle and the lane determination system. This intermediary layer resolves signal ambiguity by providing authenticated device identities and cooperative measurement data.
2Reliability
If conventional transponders are used in vehicles, then vehicle identification is achieved, but the system cannot determine vehicle location or lane of travel
Solution Approach 1:
The system merges vehicle identification (through Bluetooth device detection) with location determination (through RSSI measurements from multiple antenna zones) into a unified tracking system. The smartphone transponder simultaneously provides device identity and participates in spatial positioning by measuring signal strengths from multiple beams, combining what were previously separate functions into one integrated system.
Solution Approach 2:
The patent adds a spatial dimension to traditional transponder identification by incorporating multi-beam antenna arrays that provide angular and positional information. Instead of merely detecting presence, the system measures signal strength across multiple spatial zones and beams, transforming one-dimensional identification into multi-dimensional tracking that includes lane and position data.
3Measurement precision
If smartphones are used as active transponders with BLE capabilities, then vehicle tracking and lane determination are improved, but the system complexity increases due to need for multi-beam antennas and signal processing algorithms
Solution Approach 1:
The smartphone transponder performs self-service by autonomously measuring RSSI values from multiple beams and autonomously determining its own lane position using the provided algorithms. The device independently processes its received signal data and generates location information without requiring complex external processing infrastructure, reducing overall system complexity while maintaining high precision.
Solution Approach 2:
The system utilizes changes in signal parameters (RSSI values across different beams and antennas) to determine lane position. By monitoring how signal strength varies across the antenna array and processing these parameter changes through algorithms, the system achieves precise lane determination using relatively simple hardware that leverages natural electromagnetic field variations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Accurately determines the vehicle's lane of travel, enabling precise toll collection and traffic management by correlating smartphone data with other toll system components, even in environments with multipath interference and varying phone orientations.
Implementation Method 1
The fixed transceiver may utilize a multi-beam antenna
Implementation Method 2
leveraging Received Signal Strength Indication (RSSI) to determine the vehicle's lane of travel
Data Source
AI summary
A system combining readers for RFID transponders and Bluetooth® devices for automated roadway tolling and monitoring is described. Because of the ubiquity of Bluetooth® devices, filtering methods are described to narrow received Bluetooth® signals to a particular monitored traffic lane and to further associate the Bluetooth® signal with a registered RFID toll tag in a vehicle. Signal strength of the Bluetooth® signal at each of a plurality of receiver antennas may be used to identify the location of the Bluetooth® device that emitted the signal.