Phased Array Beamforming for Accurate 6DoF AR Controller Tracking
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Solution Overview
Problem
Existing augmented reality (AR) systems face challenges in accurately determining the six degrees of freedom (DoF) pose of handheld controllers, which is crucial for providing immersive and interactive AR experiences.
Innovation Solution
The implementation of an electromagnetic tracking system using phased array beamforming, which enables the computation of the emitter's position and orientation by steering the electromagnetic beam to maximize received power at the sensor, thereby determining the six DoF pose of the handheld controller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional tracking methods are used in AR systems, then the system complexity is reduced, but the measurement precision of six DoF pose determination deteriorates
Solution Approach 1:
The electromagnetic field is segmented into multiple directional beams through phased array elements. Each beam element can be independently controlled to steer in different directions, enabling precise spatial mapping and pose determination through systematic exploration of the electromagnetic field distribution.
Solution Approach 2:
The system changes the spatial distribution parameters of the electromagnetic field by adjusting phase and amplitude across the phased array elements. This enables dynamic beam steering and shaping to optimize the electromagnetic field pattern for accurate six DoF pose measurement while managing system complexity.
2Strength
If electromagnetic beam steering is implemented to maximize received power, then the electromagnetic field strength at the sensor increases, but the device complexity increases
Solution Approach 1:
The phased array system dynamically adjusts the phase and amplitude of each element in real-time to steer the electromagnetic beam toward the sensor. This dynamic control enables maximization of received power at the sensor location while adapting to changing spatial configurations during six DoF tracking.
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 solution enhances the accuracy of pose determination, increases electromagnetic field strength at the sensor, and enables active tracking of the emitter's position, thereby improving the overall performance and precision of AR systems.
Implementation Method 1
beamforming using phased array elements of the emitter are utilized to enable beam steering
Implementation Method 2
phased array elements of the emitter are utilized to enable beam steering
Data Source
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AI summary
An electromagnetic tracking system includes a handheld controller including a first phased array element characterized by a first phase and a second phased array element characterized by a second phase different than the first phase. The first phased array element and the second phased array element are configured to generate a steerable electromagnetic beam characterized by an electromagnetic field pattern. The electromagnetic tracking system also includes a head mounted augmented reality display including an electromagnetic sensor configured to sense the electromagnetic field pattern.