Wireless Ranging with Multiple Response Signals for Moving Targets
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Solution Overview
Problem
Conventional wireless ranging systems using two-way ranging (TWR) with ultra-wide band (UWB) signals suffer from prolonged ranging times, reduced ranging frequency, and decreased accuracy, especially when the ranging target moves at high speeds, leading to increased errors and inaccuracies.
Innovation Solution
A wireless ranging system that transmits a ranging signal followed by multiple response signals from the target terminals at different offset times and intervals, allowing the ranging terminal to measure propagation times and calculate relative distances multiple times, improving frequency and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional two-way ranging (TWR) with ultra-wide band (UWB) signals is used, then the ranging process is simple to implement, but the ranging time is prolonged and ranging frequency decreases
Solution Approach 1:
The patent segments the ranging process by having the ranging terminal transmit multiple response signals to different ranging target terminals in sequence, rather than waiting for each target to respond individually. This segmentation allows parallel processing of multiple ranging operations, thereby increasing ranging frequency while maintaining implementation simplicity
Solution Approach 2:
The ranging terminal performs preliminary actions by pre-calculating and storing multiple response signals with different offset times before actual ranging operations. This preliminary preparation enables the terminal to quickly transmit appropriate responses without prolonged processing time, thus increasing ranging frequency
2Ease of operation
If conventional two-way ranging (TWR) with ultra-wide band (UWB) signals is used, then the ranging process is simple to implement, but the ranging accuracy decreases
Solution Approach 1:
The patent implements feedback mechanisms where the ranging terminal transmits multiple response signals with different offset times and the system measures multiple propagation times. These multiple measurements provide feedback that can be averaged or processed to reduce errors, thereby improving ranging accuracy while keeping the implementation relatively simple
Solution Approach 2:
The system performs partial ranging operations by transmitting a subset of prepared response signals based on actual needs. This allows the system to achieve sufficient accuracy through multiple measurements without completing all possible ranging operations, balancing accuracy improvement with operational efficiency
3Measurement precision
If the ranging frequency decreases, then the error influence in one ranging increases, but increasing ranging frequency requires more complex signal transmission protocols
Solution Approach 1:
The ranging terminal is designed with universal functionality to handle multiple ranging target terminals using the same basic protocol framework. By making the terminal multi-functional capable of processing different response signals with various offset times, the system achieves higher ranging frequency and accuracy without proportionally increasing protocol complexity
Solution Approach 2:
The patent changes parameters such as offset times and transmission intervals of response signals to optimize ranging performance. By adjusting these parameters, the system can control the timing and frequency of ranging operations, improving accuracy through multiple measurements while managing protocol complexity through parameter optimization rather than structural complexity
4Measurement precision
If the ranging frequency decreases, then real-time distance measurement for moving targets becomes inaccurate, but increasing ranging frequency requires multiple response signal transmissions
Solution Approach 1:
The patent segments the response signal transmission by assigning different offset times to different ranging target terminals. This segmentation allows the ranging terminal to transmit multiple response signals in a structured sequence, achieving high ranging frequency for real-time tracking of moving targets while keeping the transmission mechanism organized and manageable
Solution Approach 2:
The system employs periodic action by transmitting response signals at regular intervals with predetermined offset times. This periodic transmission pattern enables consistent real-time measurement of moving targets while maintaining a predictable and manageable transmission mechanism, avoiding the need for complex adaptive protocols
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
Enhances ranging frequency and accuracy by allowing real-time distance calculations and error averaging, even with moving targets, through multiple response signal transmissions.
Implementation Method 1
a relative distance between terminals is calculated from a time when a ranging signal is transmitted from a ranging terminal to a ranging target terminal and a time when a response signal in response to the ranging signal is received by the ranging terminal
Data Source
AI summary
A wireless ranging system includes a ranging terminal that transmits a wireless signal including a ranging signal and a communication signal indicating an order of ranging with respect to a first ranging target terminal and a second ranging target terminal, and a first ranging target terminal and a second ranging target terminal that, when receiving the wireless signal, respectively transmits a first response signals and a second response signals consecutively a plurality of times to the ranging terminal. For each time the ranging terminal receives each of the plurality of response signals, the ranging terminal measures an elapsed time from transmission of the wireless signal, and calculates a relative distance between the ranging terminal and the ranging target terminals from a propagation time of each of the plurality of response signals calculated using the elapsed time.