AR Headset Coordinate Alignment for Multi-System BIM Tracking
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Solution Overview
Problem
Existing augmented reality solutions for BIM display at larger, complex construction sites face challenges in providing robust and accurate tracking across multiple heterogeneous positioning systems, leading to discrepancies and inefficiencies in aligning virtual and real-world coordinates.
Innovation Solution
A method and headset system that utilize multiple positioning systems with corresponding coordinate systems, applying transformations to map and align these systems to an extrinsic BIM coordinate system, enabling seamless tracking and rendering of augmented reality images across different environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single positioning system is used for tracking, then the system complexity is low, but the coverage area and robustness are limited
Solution Approach 1:
The patent combines multiple positioning systems (e.g., optical tracking system and electromagnetic tracking system) into a unified system that can cover larger areas and provide redundant tracking capabilities. The coordinate system alignment engine merges data from different positioning systems to maintain continuous tracking across extended coverage areas.
Solution Approach 2:
The unified positioning system is designed to perform multiple functions by integrating different positioning technologies. The system can switch between or combine multiple positioning methods depending on the environment and requirements, making it universally applicable across diverse construction site conditions.
2Adaptability or versatility
If multiple heterogeneous positioning systems are integrated, then the coverage area increases, but the coordinate alignment becomes complex
Solution Approach 1:
The patent introduces a coordinate system alignment engine as an intermediary component that automatically handles the complex task of aligning multiple heterogeneous positioning systems. This engine transforms coordinates between different positioning systems using predetermined transformation matrices, simplifying the integration process and reducing manual alignment complexity.
Solution Approach 2:
The system performs preliminary calibration and establishes predetermined transformation matrices between different positioning systems before actual tracking begins. This preliminary action simplifies real-time operation by pre-computing the coordinate transformations needed for seamless integration.
3Productivity
If manual stake out and validation processes are used, then equipment cost is low, but time consumption and labor intensity are high
Solution Approach 1:
The patent replaces manual mechanical stake-out processes and validation procedures with automated electronic positioning and tracking systems. The system automatically tracks construction elements in real-time and validates their positions against the BIM model, eliminating the need for manual measurement and validation activities.
Solution Approach 2:
The system implements continuous real-time feedback by automatically comparing the as-built construction elements with the BIM model during the construction process. This immediate feedback allows for instant validation and correction, eliminating the need for separate validation phases and significantly reducing time loss.
4Measurement precision
If frequent stake out is performed to maintain accuracy, then positioning precision is maintained, but productivity decreases due to repeated setup
Solution Approach 1:
The patent implements continuous tracking of construction elements throughout the construction process using automated positioning systems. This eliminates the need to stop work for repeated stake-out operations, as the system continuously monitors and maintains positioning accuracy without interrupting construction activities.
Data Source
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AI summary
Certain examples described herein provide a headset for use in construction at a construction site. The headset has an article of headwear, sensor devices for a plurality of positioning systems, a head-mounted display for displaying an augmented reality image of a building information model, and an electronic control system with at least one processor. The at least one processor is configured to obtain a set of transformations that map between the coordinate systems of the plurality of positioning systems. The at least one processor is configured to use the set of transformations and at least one calibrated transformation to convert between the coordinate system of a pose and an extrinsic coordinate system used by the building information model to render an augmented reality image of the building information model relative to the pose of the article of headwear on the head-mounted display.