FMCW Radar Tracking for Wearable Positioning
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Solution Overview
Problem
Traditional artificial reality systems face challenges in accurately and quickly tracking the position of users and wearable devices, leading to inadequate updating of virtual content and haptic feedback.
Innovation Solution
The implementation of radar-based tracking systems using frequency-modulated continuous-wave (FMCW) radar, which determines the position, orientation, and location of wearable devices by calculating the distance between radar devices and transponders, enabling precise tracking and updating of virtual content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional tracking systems are used, then device complexity is reduced, but tracking accuracy and speed deteriorate
Solution Approach 1:
The patent replaces traditional mechanical/optical tracking systems with a radar-based electromagnetic system. The radar device transmits electromagnetic signals that reflect off transponders on wearable devices, enabling precise tracking of position and orientation without complex mechanical sensors or cameras. This substitution achieves high measurement precision while reducing overall system complexity.
Solution Approach 2:
The patent introduces transponders as intermediary elements attached to wearable devices. These transponders receive radar signals and reflect them back with encoded information about the device's position and orientation. This intermediary approach simplifies the tracking system by offloading computational complexity from the main radar device to the lightweight transponders.
2Productivity
If traditional tracking systems are used, then system simplicity is maintained, but updating speed of virtual content deteriorates
Solution Approach 1:
The radar system operates continuously, transmitting electromagnetic signals and receiving reflections in real-time without interruption. This continuous operation enables constant updating of virtual content position and orientation, achieving high productivity. The system maintains uninterrupted tracking by constantly emitting radar signals and processing returning echoes.
Solution Approach 2:
The patent replaces frame-based or periodic tracking methods with continuous radar-based electromagnetic measurement. This substitution enables real-time updating of virtual content at radar signal frequencies, dramatically increasing productivity and response speed compared to traditional periodic sampling approaches.
3Measurement precision
If radar-based tracking is implemented, then tracking accuracy improves, but energy consumption increases
Solution Approach 1:
The radar system uses frequency-modulated continuous-wave (FMCW) radar that transmits signals at lower power levels compared to pulse radar. By using frequency modulation rather than high-power pulses, the system achieves adequate measurement precision with reduced energy consumption. The continuous low-power signaling is sufficient for tracking purposes without requiring excessive energy.
Solution Approach 2:
The transponders act as passive intermediaries that reflect radar signals without requiring active power consumption for signal generation. They modulate the reflected signal to encode position and orientation information, enabling accurate tracking while minimizing energy consumption. This passive reflection approach significantly reduces the energy budget compared to active transmitters.
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 provides improved accuracy and speed in tracking, allowing for more immersive and responsive virtual environments by accurately determining the position and orientation of wearable devices, enhancing the overall user experience.
Implementation Method 1
a radar device secured to the headset may periodically determine the distance between the radar device and one or more transponders secured to the glove
Implementation Method 2
frequency-modulated continuous-wave (FMCW) radar, which determines the position, orientation, and location of wearable devices
Data Source
AI summary
The disclosed radar system may include a radar mechanism comprising a transmitter and at least one receiver. The radar system may also include a signal generator that generates a frequency-modulated radar signal. In addition, the radar system may include a delay mechanism that (1) receives the frequency-modulated radar signal from the signal generator and (2) after a certain period of delay, passes the frequency-modulated radar signal to the transmitter to be transmitted to a transponder located on a wearable artificial reality device. The radar system may also include a processing device that (1) receives the frequency-modulated radar signal from the signal generator, (2) detects a signal returned to the receiver from the transponder, and (3) calculates a distance between the transponder and the receiver based at least in part on an analysis of the signal returned from the transponder and the frequency-modulated radar signal received from the signal generator.