Method for Calibrating a Local Positioning System Based on Time-Difference-Of-Arrival Measurements

Simple SummaryContent extracted from patent full text and abstract with AI.

This patent describes an automated method for calibrating a local positioning system (LPS) that computes the location of objects using time-difference-of-arrival (TDoA) signal measurements. The method systematically collects spatial data from mobile nodes interacting with multiple fixed beacon nodes, processes these measurements to identify and exclude errors, and then computationally determines the optimal positions of beacon nodes by minimizing overall localization error. This approach improves accuracy in 2D or 3D localization without the need for manual measurement of beacon locations.

Use CasesContent extracted from patent full text and abstract with AI.

• Calibrating indoor navigation systems in warehouses, factories, or large venues
• Setting up asset tracking systems in logistics and supply chain management
• Sports performance tracking and player movement analysis in stadiums or arenas
• Calibrating robotic navigation or autonomous vehicle guidance systems in closed environments
• Visitor or personnel tracking in hospitals, museums, or events
• Improving the accuracy of emergency response location systems indoors

BenefitsContent extracted from patent full text and abstract with AI.

• Eliminates the need for time-consuming and error-prone manual calibration of beacon positions
• Increases overall accuracy and reliability of local positioning systems
• Enhances robustness by automatically excluding measurement outliers and errors
• Reduces setup time and labor costs when deploying positioning systems
• Adaptable for both 2D and 3D localization applications
• Enables quick recalibration if system layout or environment changes

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Inventors & Applicants

Patent Abstract

The invention relates to a method for calibrating a time difference of arrival-based local positioning system for k-D localization, k=2 or 3, comprising the steps of: - Collecting (Col_Sn) N sets ((Sn) 1‰¤n‰¤N ) of time difference of arrival measurements related to a mobile node, N‰¥2, each n th set of measurements (Sn) being performed by Bn beacon nodes among B beacon nodes of the positioning system while the mobile node is located is a n th position within a region covered by the positioning system, Bn‰¥k+2. - Determining (Det_OBP) optimal beacon positions (OBP) that minimize an objective function (OF) depending on N residual error vectors ((En) 1‰¤n‰¤N ), the calculation of each n th position of the mobile node using beacon positions and the n th set of measurements (Sn), said calculation allowing the calculation of the n th residual error vector (En).