UWB Ranging Phase Detection for High-Accuracy Timing
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Solution Overview
Problem
Conventional UWB ranging systems face limitations in timing accuracy due to restricted sampling rates, leading to performance constraints, and increasing sampling rates to improve accuracy results in significant cost increases.
Innovation Solution
A method utilizing phase detection through a time coarse estimation circuit and a time fine estimation circuit within a UWB ranging processing circuit to enhance timing performance by generating fractional parts of time estimation results, leveraging a feature database for phase detection to improve accuracy without increasing material costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sampling rate is increased to improve timing accuracy, then the time accuracy is improved, but the material costs significantly increase
Solution Approach 1:
The patent segments the time estimation process into two distinct stages: coarse estimation and fine estimation. The coarse estimation circuit performs initial time estimation using standard sampling, while the fine estimation circuit refines the result using phase detection on selected samples. This segmentation allows the system to achieve high timing accuracy without requiring all samples to be processed at high resolution, thereby reducing material costs while maintaining measurement precision.
Solution Approach 2:
The patent applies partial action by performing phase detection only on selected samples rather than all samples. The fine estimation circuit uses phase information from a subset of the coarse estimation results to refine the time accuracy. This partial application of high-precision processing achieves the desired timing accuracy improvement without the excessive cost of processing every sample at maximum precision.
2Measurement precision
If the baseband sampling rate is increased to improve timing accuracy, then the cross-correlation time accuracy is improved, but the overall system cost increases
Solution Approach 1:
The patent divides the timing estimation function into separate coarse and fine estimation circuits. The coarse estimation handles the bulk of the time measurement using standard baseband sampling, while the fine estimation circuit enhances accuracy through phase detection on selected samples. This segmentation allows the system to achieve improved cross-correlation time accuracy without requiring the entire baseband system to operate at higher sampling rates, thereby controlling device complexity and system cost.
Solution Approach 2:
The fine estimation circuit acts as an intermediary that bridges the gap between standard baseband sampling and high-precision timing requirements. It takes the coarse estimation results and selected samples as input, performs phase detection to extract additional timing information, and outputs refined time estimates. This intermediary approach improves cross-correlation time accuracy without requiring the main baseband system to be redesigned at higher sampling rates.
Data Source
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AI summary
A method for enhancing timing performance of ultra-wideband (UWB) ranging with aid of phase detection and associated apparatus such as a communication circuit (121) and an electronic device (100) are provided. The method may include: utilizing a time coarse estimation circuit (210) within a UWB ranging processing circuit (124) to perform time coarse estimation according to a UWB signal to generate at least one time estimation result; and utilizing a time fine estimation circuit (230) within the UWB ranging processing circuit to perform time fine estimation according to the time estimation result to generate an estimated time; where the time coarse estimation circuit performs the phase detection according to a feature database (123) within the communication circuit and at least one feature obtained from the UWB signal, to generate at least one fractional part of the time estimation result, for enhancing time accuracy in advance to enhance the timing performance.