Passive Vehicle Entry Using Path-Based BLE and UWB Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vehicle entry systems struggle with precise detection of user approach due to limitations in radio frequency (RF) sequences, which have short detection ranges and require continuous monitoring, leading to inefficiencies and potential false alerts.
Innovation Solution
A system utilizing a combination of Bluetooth Low Energy (BLE) for long-range detection and Ultra-Wide Band (UWB) for precise positioning, activating UWB transceivers only when the user is within a closer proximity to the vehicle, based on user path prediction and direction, to enhance accuracy and reduce unnecessary power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If RF sequences are used for user detection, then detection range is extended, but detection precision deteriorates and false alerts increase
Solution Approach 1:
The system segments the detection process into two stages: initial long-range detection using RF sequences, followed by precise short-range localization using UWB technology. This segmentation allows the system to leverage the strengths of each technology - RF for extended detection range and UWB for precise positioning - thereby resolving the contradiction between detection range and precision.
2Measurement precision
If UWB transceivers are continuously activated for precise positioning, then localization accuracy is improved, but energy consumption increases
Solution Approach 1:
The system implements periodic action by activating UWB transceivers only at specific moments - when RF detection indicates a user is within threshold distance - rather than maintaining continuous operation. This periodic activation pattern maintains high localization accuracy when needed while dramatically reducing energy consumption during normal operation.
Solution Approach 2:
The system performs preliminary detection using low-power RF sequences before activating the high-precision UWB transceivers. This preliminary action allows the system to screen for potential user presence at a distance, thereby avoiding unnecessary activation of energy-intensive UWB transceivers when no user is nearby.
3Reliability
If continuous monitoring is performed to detect user approach, then detection reliability is improved, but false alerts increase and system efficiency deteriorates
Solution Approach 1:
The system introduces RF detection as an intermediary layer between continuous monitoring and final user detection. RF sequences serve as a preliminary filter that screens for user presence before triggering the more resource-intensive continuous monitoring mode, thereby reducing false alerts and improving overall system efficiency while maintaining reliable detection.
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
Enables longer detection ranges with precise user localization, reducing false alerts and optimizing energy usage by activating UWB transceivers only when necessary, thus preparing the vehicle for user arrival with improved accuracy and efficiency.
Implementation Method 1
activate the one or more second transceivers to perform time of flight distance measurement between the vehicle and the mobile device to obtain the more precise positional accuracy
Data Source
AI summary
Path-based approach to passive vehicle entry is provided. A vehicle receives messages over a first protocol from a mobile device, each of the messages indicating a heading of the mobile device and a current location of the mobile device. The vehicle and the mobile device pair responsive to the current location of the mobile device being within a first threshold distance to the vehicle. Responsive to the heading indicating that the mobile device is headed towards the vehicle and the current location of the mobile device being within a second threshold distance from the vehicle, the second threshold distance being closer to the vehicle than the first threshold distance, the vehicle activates one or more second transceivers to perform time of flight distance measurement between the vehicle and the mobile device to obtain more precise positional accuracy, and otherwise maintains the one or more second transceivers in a deactivated mode.