Wireless Communication Device Motion Detection via Doppler Shift
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Solution Overview
Problem
Existing motion detection systems, such as motion sensors and proximity sensors, face challenges in accurately and promptly detecting motion of various objects across different environments, including large rooms, open spaces, and outdoor areas.
Innovation Solution
The proposed solution involves a method and apparatus that use wireless signals to detect motion by transmitting a first wireless signal and receiving a second wireless signal that is a reflected version of the first signal. The system extracts a modulation signal containing a Doppler shift caused by the object's motion and determines the presence of motion based on the signal envelope variation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If motion sensors and proximity sensors are installed to detect motion of objects, then motion detection capability is provided, but additional installation requirements and limited applicability to various environments occur
Solution Approach 1:
The system uses the object's own reflected wireless signal to detect motion, eliminating the need for separate sensors. The wireless communication device itself performs both transmission and detection functions, making the system self-sufficient and reducing installation complexity.
Solution Approach 2:
The wireless communication device is designed to perform multiple functions: transmitting wireless signals for communication and detecting motion of objects simultaneously. This multi-functionality eliminates the need for dedicated motion sensors and expands applicability across different environments.
2Measurement precision
If Doppler shift detection circuits are installed to detect motion and position, then accurate motion detection is achieved, but additional installation requirements and environmental limitations occur
Solution Approach 1:
The patent combines the Doppler shift detection circuit with the wireless communication device, merging two separate functions into one integrated system. This eliminates the need for additional standalone Doppler detection equipment while maintaining accurate motion detection capabilities.
Solution Approach 2:
The wireless communication device performs self-diagnosis by using its own transmitted signal's reflected version to detect motion through Doppler shift analysis, eliminating the need for external detection equipment.
3Adaptability or versatility
If traditional motion sensors are used to detect motion in various environments, then motion detection is provided, but accurate and prompt detection of a variety of objects is not achieved
Solution Approach 1:
The system analyzes changes in the reflected wireless signal's frequency (Doppler shift) to detect motion. By monitoring frequency parameter changes rather than relying on fixed sensor thresholds, the system achieves accurate and prompt detection of various objects across different environments.
Solution Approach 2:
The wireless communication device serves multiple purposes: communication and universal motion detection for various object types (inanimate objects, humans, animals) in diverse environments (large rooms, open spaces, outdoor areas), eliminating the need for environment-specific sensor configurations.
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 enables accurate and prompt detection of motion in various environments without the need for extensive sensor installation, and it can differentiate between different types of objects and environments.
Implementation Method 1
obtaining a modulation signal related to a combination of the transmission and incoming signals, wherein the modulation signal contains a Doppler shift caused by the motion of the object
Data Source
AI summary
Methods and apparatus for detecting motion of an object in an environment, the method including transmitting a first wireless signal related to a transmission signal and receiving a second wireless signal related to an incoming signal, wherein the second wireless signal is a reflected first wireless signal from the object, obtaining a modulation signal related to a combination of the transmission and incoming signals, wherein the modulation signal contains a Doppler shift caused by the motion of the object, extracting a signal envelope varied by the Doppler shift from the modulation signal, and determining whether motion of the object is detected in accordance with the signal envelope.