Vehicle Wireless Device Location Detection Using UWB and Dead Reckoning
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Solution Overview
Problem
Existing vehicle systems for determining the location of a wireless device relative to a vehicle lack accuracy, particularly when communication is interrupted, and often rely on less precise methods for positioning within authorized zones.
Innovation Solution
A vehicle system utilizing a main base station and auxiliary base stations that employ time of flight (TOF) and trilateration techniques, combined with dead reckoning or adaptive predictability estimation, to accurately determine the location of a wireless device using ultra-wide band (UWB) communication, enabling precise positioning within specific zones around the vehicle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional location determination methods are used, then the system is simpler to implement, but the location accuracy deteriorates especially when communication is interrupted
Solution Approach 1:
The system performs preliminary actions by establishing communication with the wireless device and obtaining its initial location before communication is interrupted. This preliminary location data is stored and serves as a baseline for subsequent dead reckoning calculations, allowing the system to maintain location accuracy even when communication is later interrupted.
Solution Approach 2:
The system introduces intermediary elements including multiple base stations that provide redundant communication paths, and uses dead reckoning algorithms as an intermediary calculation method to estimate location when direct communication is unavailable. These intermediaries bridge the gap between communication interruptions and continuous location tracking.
2Reliability
If multiple base stations and advanced algorithms are deployed, then location determination reliability improves during communication interruptions, but device complexity increases
Solution Approach 1:
The system applies local quality by deploying base stations at specific strategic locations around the vehicle and using different algorithms (dead reckoning vs. adaptive predictability estimation) based on the specific situation. Each base station and algorithm serves a localized function, improving overall reliability without requiring uniform complexity throughout the entire system.
Solution Approach 2:
The system implements partial action by using dead reckoning or adaptive predictability estimation only when communication is interrupted, rather than continuously. This selective application of complex algorithms reduces their overall impact on system complexity while maintaining reliability during critical periods when communication is unavailable.
3Measurement precision
If dead reckoning or adaptive predictability estimation is used, then positioning accuracy is maintained during communication gaps, but computational requirements increase
Solution Approach 1:
The system uses periodic action by alternating between normal communication-based location determination and dead reckoning/adaptive predictability estimation based on communication availability. This periodic switching allows the system to maintain positioning accuracy during communication gaps while avoiding continuous use of computationally intensive algorithms, thereby reducing overall energy consumption.
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
This approach enhances the accuracy of wireless device location determination, allowing for precise unlocking and remote operation of vehicles, even when communication is partially disrupted, and supports applications like tire pressure monitoring with high resolution and reliability.
Implementation Method 1
employ time of flight (TOF) and trilateration techniques, combined with dead reckoning or adaptive predictability estimation, to accurately determine the location of a wireless device using ultra-wide band (UWB) communication
Data Source
AI summary
A vehicle system and method is provided for detecting the location of a portable wireless device. The vehicle system includes the portable device and a plurality of base stations positioned about a vehicle. The portable device is configured to transmit a first wireless signal and a second wireless signal indicative of motion data of the portable device. A main base station of the plurality of base stations is configured to determine a first final position of the portable device in response to each of the plurality of base stations successfully receiving the first wireless signal. The main base station is further configured to determine a second final position of the portable device using the first final position and the motion data of the second wireless signal as received at the first base station and after determining that the second base station has not successfully received the second wireless signal.