UWB Distance Detection Calibration for Transmission Line Errors
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Solution Overview
Problem
Mobile devices experience detection errors due to non-ideal effects of their transmission lines, particularly in UWB frequency bands, leading to inaccuracies in distance measurements.
Innovation Solution
A detection device with a calibration function that includes an antenna element, transmission line, detection circuit, and processor, where the processor calculates a calibrated distance by subtracting an error distance from an estimated distance obtained via a ToF process using UWB signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a transmission line is used to connect the antenna element and detection circuit, then the device can be manufactured with standard components, but measurement precision deteriorates due to non-ideal effects in the transmission line
Solution Approach 1:
The patent applies preliminary action by pre-calculating the error distance caused by the transmission line's non-ideal effects and storing it in a lookup table. During operation, the processor retrieves the pre-calculated error value based on the measured distance and subtracts it from the raw measurement, thereby compensating for the transmission line's impact without requiring real-time complex calculations or additional hardware
Solution Approach 2:
The patent changes the parameter of distance measurement by introducing a calibration parameter (error distance) that adjusts the raw measurement. The processor modifies the measured distance value by subtracting the pre-calculated error distance, thereby transforming the inaccurate measurement into a calibrated accurate measurement while keeping the physical transmission line unchanged
2Measurement precision
If the transmission line length is reduced to minimize error distance, then measurement precision improves, but device design flexibility and adaptability worsen
Solution Approach 1:
The patent performs preliminary calculation and storage of error distances for various transmission line lengths. This allows the system to accommodate different transmission line lengths (adapting to various design needs) while maintaining measurement accuracy through pre-computed compensation values stored in lookup tables, eliminating the need to fix the transmission line length to a specific value
Solution Approach 2:
The patent introduces an intermediary calibration mechanism (error distance compensation) between the transmission line and the measurement result. This intermediary layer allows different transmission line configurations to be used without directly impacting measurement accuracy, as the calibration process mediates between the physical constraint and the measurement requirement
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 calibration function significantly reduces measurement errors caused by transmission line non-ideal effects, enhancing the accuracy of distance detection in mobile devices.
Implementation Method 1
The detection circuit uses the antenna element to transmit the detection signal to the object and receive a feedback signal from the object. Both the detection signal and the feedback signal operate in a UWB (Ultra-Wide Band) frequency band.
Implementation Method 2
The detection process is a ToF (Time of Flight) process.
Data Source
AI summary
A detection device with a calibration function is configured to detect an object. The detection device includes an antenna element, a transmission line, a detection circuit, and a processor. The transmission line is coupled to the antenna element. The detection circuit is coupled to the transmission line. The detection circuit performs a detection process, so as to obtain an estimated distance between the antenna element and the object. The processor is coupled to the detection circuit. The processor calculates the calibrated distance by subtracting the error distance from the estimated distance.