Vehicle UWB Anchor Receiving Window Adjustment for Ranging Reliability
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Solution Overview
Problem
UWB communication in vehicles is hindered by metal vehicle bodies obstructing signal transmission, leading to repeated failures and increased power consumption due to clock errors between user terminals and UWB anchors.
Innovation Solution
Adjust the receiving window of UWB anchors based on the number of ranging failures to enhance success probability and reduce power consumption by incrementally increasing the window length in response to failure counts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the receiving window length is increased to compensate for clock errors and improve UWB ranging success probability, then the reliability of UWB ranging is improved, but the power consumption of the UWB anchor device increases
Solution Approach 1:
The receiving window length is made dynamic rather than fixed. The system automatically adjusts the window length based on the number of reception failures: starting with an initial value, and increasing it when failures occur. This dynamic adaptation allows the system to maintain high reliability when needed while conserving power during successful operations.
Solution Approach 2:
The system changes the parameter of receiving window length based on operational conditions. By monitoring reception failure counts and adjusting the window length parameter accordingly, the system optimizes the balance between ranging success probability and power consumption, avoiding unnecessary power expenditure when the initial window length is sufficient.
2Measurement precision
If the receiving window length is increased to account for clock errors, then the measurement precision of signal arrival time is improved, but the device complexity increases
Solution Approach 1:
The system implements feedback control by monitoring reception failure outcomes and using this information to adjust the receiving window length. This feedback mechanism ensures that the window length is optimized based on actual performance, maintaining measurement precision while avoiding unnecessary complexity through rule-based adjustment rather than complex adaptive algorithms.
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
Improves UWB ranging success while minimizing power consumption by dynamically adjusting the receiving window in accordance with failure rates, optimizing operation efficiency.
Implementation Method 1
UWB communication technology calculates a distance between communication subjects by multiplying a signal arrival time between the communication subjects by a speed of light by utilizing time of flight (ToF) technology of signals
Data Source
AI summary
A method for an ultra-wide band (UWB) anchor device for adjusting a receiving window for waiting to receive a message transmitted from a user terminal to perform UWB ranging. The method includes setting a length of the receiving window to an initial value, counting a number of reception failures of the message until the message is received, and performing the UWB ranging based on the length of the receiving window being set to the initial value or adjusting the initial value, based on the number of reception failures.