UWB Distance Determination Using Smallest Valid Value Selection
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Solution Overview
Problem
Existing methods for determining the time of flight or distance between transceivers, such as those used in motor vehicles and vehicle keys, are susceptible to interference and lack reliability, making them vulnerable to manipulation.
Innovation Solution
The solution involves selecting the smaller or last valid distance value from multiple determinations, and by having transceivers exchange messages with multiple other transceivers to determine multiple distance values, enhancing security and reliability through UWB-based ranging methods and evaluation units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If distance determination is performed using conventional methods, then the process is simple, but the determination is susceptible to interference and manipulation
Solution Approach 1:
The patent divides the distance determination process into multiple independent measurement operations, where multiple distance values are determined through separate message exchanges between transceivers. Each measurement is independently evaluated, and the final distance is derived from selecting the smallest valid value among multiple determinations, thereby reducing susceptibility to interference and manipulation in any single measurement.
2Reliability
If multiple distance determinations are performed to increase security, then reliability improves, but the time and complexity increase
Solution Approach 1:
The patent performs multiple distance determinations and stores the results in advance before a final decision is required. The evaluation unit pre-processes multiple distance values and identifies the smallest valid distance value ahead of time, so that when authentication or access control decisions are needed, the system can quickly retrieve the pre-evaluated result without performing time-consuming multiple measurements at the moment of decision.
3Measurement precision
If the smallest distance value is selected from multiple determinations, then accuracy improves, but vulnerability to interference increases
Solution Approach 1:
The patent implements a feedback mechanism where multiple distance measurements are taken and each result is evaluated against validity criteria. The evaluation unit continuously monitors the measurements and selects the smallest distance value that meets predefined validity conditions. This feedback loop ensures that outlier values caused by interference are filtered out while maintaining precision by selecting from multiple validated measurements.
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 reduces interference susceptibility and increases reliability by selecting the most accurate distance value and providing multiple distance determinations, thereby enhancing the security and efficiency of the distance determination process.
Implementation Method 1
determining a distance value representing a time of flight and/or a distance between at least two transceivers
Data Source
AI summary
Disclosed are a method and a device for determining, repeated in time intervals, of at least one of a distance value representing a time of flight and a distance between at least two transceivers by exchanging messages between the at least two transceivers, wherein on the part of at least one transceiver: at least one antenna is provided in each case for transferring messages by in each case at least one of transmitting and receiving the messages, wherein furthermore at least one evaluation unit is provided to determine a first distance value using messages transferred by at least one antenna and to determine at least one second distance value using of messages transferred by at least one antenna, wherein furthermore a selection unit is provided, which is configured to select in each case, from the last determined distance values, the smallest distance value