UWB Positioning Clock Offset Correction for Non-DS-TWR Devices
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face challenges in accurately determining the target relative clock offset for ultra-wideband (UWB) positioning, particularly for devices that are not double-sided two-way ranging (DS-TWR) capable, which affects the accuracy of location determination.
Innovation Solution
A method and system for determining the target relative clock offset using additional information from reference responder devices that are DS-TWR capable, enabling accurate time of flight measurements and location determination for UWB devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If non-DS-TWR capable responder devices are used for UWB positioning, then device compatibility and ease of operation are improved, but measurement precision and location accuracy deteriorate due to inability to perform double-sided two-way ranging
Solution Approach 1:
The patent introduces reference responder devices as intermediaries that are DS-TWR capable. These reference devices perform the accurate double-sided two-way ranging measurements and provide clock offset information that is then used to correct the time of flight measurements from non-DS-TWR capable responder devices, thereby enabling accurate positioning without requiring all devices to be DS-TWR capable
Solution Approach 2:
The patent implements a feedback mechanism where reference responder devices provide clock offset information back to the initiator device. This feedback allows the initiator to compensate for clock synchronization errors in non-DS-TWR capable responder devices, correcting measurement errors and improving location accuracy while maintaining compatibility with simpler devices
2Measurement precision
If DS-TWR capable responder devices are used, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent segments the responder devices into two categories: reference responder devices that are DS-TWR capable and perform accurate measurements, and target responder devices that are simpler non-DS-TWR capable devices. This segmentation allows the system to achieve high measurement precision through the reference devices while using simpler, less expensive devices for general positioning, thereby reducing overall system complexity and cost
3Ease of operation
If clock offset is not accounted for in time of flight measurements, then ease of operation is improved, but measurement precision deteriorates due to inaccurate location determination
Solution Approach 1:
The patent performs preliminary clock synchronization measurements using reference responder devices before the actual positioning measurements. The reference devices establish accurate clock offset values in advance, which are then stored and applied during time of flight measurements. This preliminary action corrects for clock synchronization errors without adding complexity to the actual positioning operation, maintaining ease of use while improving measurement precision
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 the accuracy of determining the location of UWB devices by accounting for relative clock offsets, allowing for precise positioning even with non-DS-TWR capable devices.
Implementation Method 1
transmitting a ranging initiation message to a plurality of responder devices based on a first radio access technology (RAT)
Implementation Method 2
determining a time of flight between the initiator device and the target responder device based on one or more time of flight measurements
Data Source
AI summary
Disclosed are techniques for wireless communication. In an aspect, an initiator device may transmit a ranging initiation message and a ranging final message to a plurality of responder devices. The initiator device may determine a target relative clock offset between a target responder device of a first subset of the plurality of responder devices and the initiator device based on one or more reference responder devices of a second subset of the plurality of responder devices, the first subset of the plurality of responder devices having successful reception of either the ranging initiation message or the ranging final message, and the second subset of the plurality of responder devices having successful reception of the ranging initiation message and the ranging final message. The initiator device may determine a time of flight based on one or more time of flight measurements and the target relative clock offset.