AR Device Orientation Using SAR for Indoor Spatial Alignment
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Solution Overview
Problem
Existing augmented reality systems struggle with accurately tracking and maintaining device orientation in complex environments, particularly in indoor settings, leading to inconsistent user experiences due to the need for direct interaction and inaccuracy in device location and orientation, especially in collaborative scenarios.
Innovation Solution
A system utilizing a phased array antenna and synthetic aperture radar (SAR) to passively detect wireless signals, generate 3D spatial maps, and integrate sensor data for precise device location and orientation, enabling real-time AR representation with gesture-based interactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional tracking methods with direct interaction (app installation, GPS activation) are used, then device location can be obtained, but the system becomes intrusive and inaccurate in indoor environments
Solution Approach 1:
The system enables passive tracking where devices are automatically detected and located without requiring users to install apps or activate GPS. The phased array antenna system autonomously detects wireless signals from devices and determines their locations through signal processing algorithms, making the tracking system self-sufficient and eliminating the need for user intervention.
Solution Approach 2:
The patent replaces traditional GPS satellite-based positioning with a radar-based electromagnetic signal detection system. The phased array antenna uses electromagnetic waves to detect device locations and orientations, providing accurate indoor positioning without relying on satellite signals or user-configured GPS systems.
2Reliability
If existing AR systems are used in collaborative scenarios, then virtual objects can be displayed, but accurate placement and maintenance of virtual objects in shared environments is difficult
Solution Approach 1:
The system creates a universal coordinate framework that multiple devices can simultaneously access and use for virtual object placement. The centralized server maintains a shared spatial map that all user devices can reference, ensuring consistent virtual object positioning across multiple devices in collaborative scenarios without requiring complex peer-to-peer synchronization.
Solution Approach 2:
The patent introduces a centralized server as an intermediary that manages the shared spatial environment and coordinates between multiple user devices. This server acts as a mediator that receives data from all devices, maintains the authoritative spatial map, and distributes updated information back to devices, simplifying the complexity of multi-device coordination.
3Stability of the object's composition
If AR applications are used with variations in device orientation and user movements, then AR experiences can be delivered, but inconsistencies occur due to poor alignment
Solution Approach 1:
The system continuously monitors device orientation using sensors (accelerometers, gyroscopes, magnetometers) and provides real-time feedback to adjust the AR rendering. The phased array antenna tracks device movements and updates the spatial map dynamically, allowing the system to compensate for orientation changes and maintain consistent virtual-physical alignment throughout the AR experience.
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
Ensures consistent and accurate AR experiences by providing precise device tracking and orientation, allowing for immersive and interactive AR applications with real-time updates and reduced user intervention.
Implementation Method 1
a phased array antenna and an antenna module configured to detect, using the phased array antenna, wireless signals from at least one user device
Implementation Method 2
a synthetic aperture radar (SAR) system configured to transmit, via the phased array antenna, microwave radar signals into the environment; receive, via the phased array antenna, reflected signals from the environment
Implementation Method 3
transmit, via the phased array antenna, microwave radar signals into the environment
Implementation Method 4
the SAR module uses time delay and/or frequency shift information from the reflected signals to determine the at least one of the distance and the movement of the one or more objects
Implementation Method 5
the SAR module uses time delay and/or frequency shift information from the reflected signals to determine the at least one of the distance and the movement of the one or more objects
Data Source
AI summary
A method for determining the orientation of a tracked device uses sensor data from inertial motion units, accelerometers, and synthetic aperture radar to capture images and analyze signal patterns, determining the device's facing direction. This method, integrated with an augmented reality framework, supports real-time interactions and precise placement of virtual markers and facilitates AR collaborative, interactive gameplay, asset tracking, and security applications, enabling accurate virtual object placement and real-time monitoring.