Radar-Based Artificial Reality Tracking Using FMCW Transponders
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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 in artificial reality systems, then the system complexity is reduced, but the tracking accuracy and speed deteriorate
Solution Approach 1:
The patent replaces traditional mechanical/optical tracking systems with an electromagnetic-based radar system. The radar system uses electromagnetic waves to detect transponders on wearable devices, achieving high-precision tracking without complex mechanical components. This substitution enables accurate determination of position, orientation, and location through signal processing rather than mechanical sensing.
Solution Approach 2:
The patent introduces transponders as intermediary elements between the radar system and wearable devices. These transponders facilitate the radar's ability to detect and track devices by providing reflective or active signal responses, enabling accurate tracking while keeping the radar system itself relatively simple in structure.
2Productivity
If traditional tracking systems are used, then the device complexity is reduced, but the updating speed of virtual content deteriorates
Solution Approach 1:
The radar system replaces slow mechanical tracking methods with rapid electromagnetic signal processing. This enables real-time detection of user position and device location, allowing virtual content and haptic feedback to be updated at high speeds that match the dynamic nature of artificial reality experiences.
3Measurement precision
If radar-based tracking is implemented, then tracking accuracy is improved, but energy consumption increases
Solution Approach 1:
The radar system employs periodic transmission of frequency-modulated continuous-wave signals rather than continuous high-power transmission. This periodic operation allows the system to achieve accurate tracking measurements while reducing average energy consumption compared to continuous scanning or high-power pulsed radar systems.
4Speed
If radar-based tracking is implemented, then tracking speed is improved, but device complexity increases
Solution Approach 1:
The radar system is divided into separate functional modules including signal generation, frequency multiplication, transmission, reception, and processing components. This segmentation allows each module to be optimized independently and simplifies the overall system architecture, enabling high-speed tracking without requiring a monolithic complex system.
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 provides enhanced accuracy and speed in tracking user positions and devices, allowing for timely and precise updates of virtual content and haptic feedback, thereby improving the overall user experience in artificial reality environments.
Implementation Method 1
at least one frequency multiplier that, after multiplying a frequency of the frequency-modulated radar signal by a certain factor
Implementation Method 2
detect a signal returned to the receiver from the transponder in response to the frequency-modulated radar signal and calculate a distance between the transponder and the receiver based at least in part on an analysis of the signal returned
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 at least one frequency multiplier that, after multiplying a frequency of the frequency-modulated radar signal by a certain factor, synchronously passes the frequency-modulated radar signal to (1) the transmitter to be transmitted to at least one transponder located on a wearable device and (2) a processing device communicatively coupled to the receiver. The processing device may (1) detect a signal returned to the receiver from the transponder in response to the frequency-modulated radar signal and (2) calculate 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 frequency multiplier.