mm-wave Radar Sensor for 2D Gesture Detection
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Solution Overview
Problem
Current gesture detection sensors face challenges in cost, power consumption, and complexity, particularly in detecting 2D target movements independently of distance, which limits their effectiveness in portable and consumer applications.
Innovation Solution
A low-cost, low-power mm-wave radar sensor system with integrated mm-wave IC front-end and a specific topology that uses planar antenna systems and power detectors to detect 2D angles without distance detection, enabling efficient gesture recognition and optional vital sign monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If video-based sensors are used for gesture detection, then gesture recognition capability is achieved, but power consumption and device size increase
Solution Approach 1:
The patent replaces video-based optical systems with mm-wave radar technology that uses electromagnetic waves for gesture detection. This substitution achieves comparable gesture recognition accuracy while dramatically reducing power consumption and enabling compact integration in portable devices, as the radar system processes only essential movement data rather than full video streams
2Measurement precision
If distance detection is included in the sensor system, then target positioning accuracy improves, but system complexity and cost increase
Solution Approach 1:
The patent extracts and isolates the angle detection functionality from full 3D positioning capabilities. By using two pairs of receiving antennas focused on angular measurement in 2D space, the system achieves sufficient target positioning accuracy for gesture recognition without implementing complex distance detection mechanisms, thereby reducing overall system complexity and cost
3Measurement precision
If multiple receiving antenna pairs are used for 2D angle detection, then angle resolution improves, but manufacturing complexity increases
Solution Approach 1:
The patent segments the receiving antenna system into two independent pairs, where each pair is dedicated to detecting angles in a specific plane. This segmentation allows for modular manufacturing and assembly, improving angle detection resolution through spatial diversity while keeping individual antenna pair designs simple and easier to manufacture
4Use of energy by stationary object
If the sensor is designed for very low power consumption, then battery life extends, but detection capability may be limited
Solution Approach 1:
The patent employs parameter changes by operating the mm-wave radar in continuous wave mode with simplified signal processing that focuses exclusively on angle detection rather than full 3D positioning. This parameter optimization maintains reliable gesture detection capability while minimizing power consumption, enabling battery-powered operation in portable devices
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
The system achieves efficient gesture detection and vital sign monitoring with reduced power consumption and complexity, allowing for integration in small portable devices like tablets and smartphones, while maintaining low cost and size.
Implementation Method 1
mm-wave radar sensor system with integrated mm-wave IC Front End
Implementation Method 2
detecting the target movements by 2-dimensional angle detection
Implementation Method 3
N mm-wave power detectors, where N takes integer values from 2 and higher
Data Source
AI summary
The present invention relates to a gesture detection Apparatus and Method of Operation comprising of an mm-wave radar sensor, having an integrated mm-wave IC front end, with special arrangement of the antenna system, with a new art of angle detection and which does not contain radio down-conversion topology, common in non-professional radar systems. The proposed Apparatus is capable of detecting the two dimensional target angle, having an inherently low-cost system topology, suitable as a replacement in functionality for the commonly used gesture detection system in consumer applications. The proposed apparatus topology consist of two transmitting planar antennae, and two pairs of receiving antennae without the down-conversion of receiver chains, but with introduced analog signal combining structures and mm-wave power detectors. The complete proposed sensor apparatus topology with integrated antennae, mm-wave IC and digital processing parts may be realized in a module smaller than 1×1×0.5 cm and operating in the 60 GHz band for industrial, health care and consumer applications, as well as in the 77-81 GHz band for automotive applications. The integration of the sensor module may be performed in polymer technologies. Sensor can be used as a part of other device or as a gadget.