Vehicle Positioning via UWB and Radar Fusion
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Solution Overview
Problem
Existing vehicle access and authentication systems face challenges in ensuring high detection reliability and accuracy for triggering vehicle components, particularly in preventing relay station attacks and adapting to specific scenarios, while maintaining security and functionality.
Innovation Solution
A control system that combines multiple radio connection units and radar units to determine the operator's position using radio signal strength and radar responses, with a central control unit for trilateration and plausibility checks, ensuring accurate and reliable position information even in scenarios where radio communication is disrupted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a positioning system uses only radio connection units for operator location detection, then the system is simple and energy-efficient, but detection reliability decreases when line of sight is interrupted or relay station attacks occur
Solution Approach 1:
The patent combines radio connection units and radar units into a single positioning system. The control unit integrates position information from both radio signals (for authentication and coarse positioning) and radar signals (for precise positioning and line-of-sight verification). This merging of different sensing modalities resolves the contradiction by maintaining simplicity through unified system architecture while achieving high reliability through complementary sensing that works even when one modality is compromised.
2Measurement precision
If the positioning system uses both radio connection units and radar units, then detection reliability and accuracy improve, but device complexity and cost increase
Solution Approach 1:
The control unit is designed to perform multiple functions: it processes radio signals for authentication and initial positioning, processes radar signals for precise positioning and plausibility verification, and makes triggering decisions based on integrated analysis of both signal types. This multi-functionality allows the system to achieve high measurement precision through combined radio and radar data while avoiding the complexity of separate dedicated processing units for each sensing modality.
3Measurement precision
If radio communication is used for authentication and positioning, then energy consumption is low, but detection accuracy decreases when operators are at distance or obstacles are present
Solution Approach 1:
The system uses periodic radar signal transmission at controlled intervals rather than continuous transmission. The radar units transmit signals periodically to obtain position information, and the control unit processes these periodic measurements to determine operator location. This periodic action maintains low energy consumption while achieving high position detection accuracy by capturing sufficient data points over time to verify operator presence and location, especially when obstacles may intermittently block signals.
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
The system provides robust and reliable position information, maintaining functionality and security by using UWB radio and radar technologies to ensure accurate operator location detection, even in situations where line of sight is interrupted, thereby enhancing the availability of position data and preventing false triggering.
Implementation Method 1
the positioning system is configured for radio communication with the ID transmitter. Based on the radio communication, the ID transmitter is authenticated to the control system, and the control system triggers the function of a vehicle component
Implementation Method 2
Furthermore, the positioning system comprises one or more radar units, which are also arranged at a distance from one another on the vehicle
Implementation Method 3
The central control unit is configured to derive first position information from signal information of radio signals which the radio connection units receive from the ID transmitter, and to derive second position information from radar responses
Data Source
Figure 1
AI summary
The invention relates to a control system (2) for triggering a function of a vehicle component (4) of a motor vehicle (3). The control system includes a tracking system (5). The tracking system (5) serves to locate an operator carrying an ID transmitter (9). The ID transmitter (9) communicates with the vehicle, for example, via a communication arrangement (10), exchanging UWB signals (100a, 100b, 100c) and UWB response signals (200a, 200b, 200c). The ID transmitter can also include a motion sensor (11) and a microcontroller (12). The tracking system (5) includes several radio communication units (6a, 6b, 6c) and one or more radar units (7a, 7b, 7c), as well as a central control unit (8). Optionally, position information obtained with the radar units (7a, 7b, 7c) can be used to verify position information obtained with the radio communication units (6a, 6b, 6c).The invention further relates to a vehicle function release system (1).