UWB Handheld Localization for Large-Area Real-Time UI Input
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Solution Overview
Problem
Current localization technologies for large surface areas, such as computer mice and touchscreens, suffer from impracticality and high cost, and existing RF, acoustic, and magnetometer methods lack the precision needed for real-time control applications.
Innovation Solution
An ultra-wideband localization system using unidirectional messaging protocol with time difference of arrival (TDoA) measurements, combined with orientation and contact sensors, provides sub-millimeter resolution and sub-millisecond latency for handheld instruments, enabling precise UI input in large work areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If traditional hand-held pointing devices or touchscreen technology are used for large surface areas, then user interface functionality is provided, but the system becomes impractical and costly
Solution Approach 1:
The patent replaces mechanical pointing devices and touchscreen sensors with a wireless RF localization system using time difference of arrival (TDoA) measurements. The system uses multiple antennas to track a handheld instrument's position wirelessly, eliminating the need for physical contact surfaces or mechanical mouse movement across large areas.
Solution Approach 2:
The patent introduces RF signals as an intermediary to transfer position information between the handheld instrument and the work surface system. The instrument contains a transmitter that sends RF signals, and multiple base station antennas receive these signals to calculate position, serving as an intermediary communication layer between the user and the large surface interface.
2Area of stationary object
If RF, acoustic, or magnetometer localization methods are used for large areas, then coverage is improved, but measurement precision deteriorates
Solution Approach 1:
The patent changes the measurement parameter from traditional RF signal strength or acoustic time of flight to time difference of arrival (TDoA) with sub-nanosecond precision. By measuring the arrival time differences of RF signals at multiple synchronized antennas, the system achieves centimeter-level accuracy across large areas, resolving the trade-off between coverage and precision.
3Measurement precision
If high precision localization is achieved for real-time control, then measurement accuracy is improved, but system complexity increases
Solution Approach 1:
The patent segments the localization system into distinct functional modules: handheld instruments with transmitters, base stations with synchronized antennas, and a localization server for TDoA calculation. This segmentation allows each component to be optimized independently while maintaining overall system precision, managing complexity through modular architecture.
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 system achieves high precision localization with sub-millimeter accuracy and low latency, suitable for real-time control applications in large workspaces and non-conforming 3D environments.
Implementation Method 1
an ultra-wide band antenna and communication interface... transmit and receive a plurality of ultra-wide band signals
Implementation Method 2
measure a plurality of time measurements and one or more phase measurements... determine a time-difference of arrival (TDOA) measurements
Data Source
AI summary
An exemplary system and method are disclosed for a handheld or hand-enclosed instrument configured with ultra-wideband localization using unidirectional messaging protocol based on time difference of arrival (TDoA) measurements that can be used as inputs, in a realtime control loop, to a software application that uses the handheld or hand-enclosed instrument as an input user interface. The handheld or hand-enclosed instrument can be readily employed for UI in large work areas (e.g., 2D), such as a whiteboard or wallboard, with sub-millimeter resolution and sub-millisecond latency. The handheld or hand-enclosed instrument can be readily employed in a UI device for non-conforming 3D workspace such as a sculpting instrument, in hand-enclosed game interface, as a remote medical instrument, among others described herein.