UWB Anchor Delay Synchronization for Indoor Localization
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Solution Overview
Problem
Indoor wireless localization systems face challenges in accurately determining the location of mobile tags in indoor environments due to the imprecision or unavailability of outdoor GPS systems, requiring innovative methods for precise localization and communication.
Innovation Solution
The system employs a network of anchors transmitting ultra-wideband (UWB) localization packets at different delay times, allowing mobile tags to determine their location using multilateration and communicate simultaneously by receiving overlapping payload-less and payload-carrying packets, with an initialisation packet synchronizing the transmission times and enabling position updates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If outdoor GPS systems are used for localization, then localization can be performed outdoors, but the system becomes imprecise or unusable in indoor environments
Solution Approach 1:
The system divides the localization problem into two distinct segments: outdoor GPS-based localization and indoor UWB-based localization. Each segment uses the most appropriate technology for its environment, with the indoor system employing multiple anchors at known locations to perform multilateration and determine mobile tag positions with high precision regardless of outdoor GPS availability
Solution Approach 2:
The localization system is designed to be universal by supporting both outdoor and indoor environments. The system can switch between GPS for outdoor locations and UWB multilateration for indoor locations, making it applicable across diverse spatial contexts without requiring separate dedicated systems
2Measurement precision
If anchors transmit localization packets continuously, then localization accuracy is maintained, but communication efficiency decreases due to overlapping transmissions
Solution Approach 1:
The system implements periodic action by having anchors transmit localization packets at specific intervals rather than continuously. Each anchor transmits at predetermined times within a timeslot, creating a periodic pattern that ensures sufficient localization data reaches mobile tags while avoiding constant overlapping transmissions that would reduce communication efficiency
Solution Approach 2:
The system applies preliminary action by pre-synchronizing anchor transmission times and pre-assigning specific anchors to transmit at specific times within each timeslot. This preliminary coordination prevents collisions and overlapping transmissions before they occur, maintaining localization accuracy while optimizing communication efficiency
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
This approach enables accurate and simultaneous localization and communication of mobile tags within indoor environments, improving location determination and communication efficiency by leveraging UWB technology and synchronized packet transmission.
Implementation Method 1
determining the location of one or more mobile tags based on times of arrival or time differences of arrivals of a plurality of localisation packets
Data Source
AI summary
A method is provided for localizing mobile tags using a system including a plurality of anchors located at known locations, the method including: transmitting a plurality of ultra-wideband (UWB) localization packets using respective anchors of the plurality of anchors, in which each of the plurality of localization packets is transmitted by a respective anchor of the plurality of anchors at a different respective delay time; and transmitting an update UWB packet with either an anchor of the plurality of anchors that does not transmit one of the localization packets, or with a mobile tag, in which the localization packets include no payloads, the update packet includes a payload, and in which successive ones of the plurality of localization packets and the update packet overlap with each other in time. A system for localizing mobile tags is also provided.