Wireless Motion Detection via Channel Response Analysis
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Solution Overview
Problem
Existing motion detection systems face challenges in accurately detecting movement without line-of-sight and in environments with noise and interference from other wireless transmitters, particularly in unlicensed or licensed radio bands.
Innovation Solution
A motion detection system that uses wireless reference signals to detect changes in channel responses, employing a transmitter and receiver with data processing apparatuses to determine channel responses, quality metrics, and isolate interference, allowing for motion detection through radio frequency signals even in the presence of other wireless transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireless reference signals are used for motion detection, then motion detection without line-of-sight is enabled, but noise and interference from other wireless transmitters increase
Solution Approach 1:
The patent introduces channel responses as an intermediary representation that mediates between the transmitted reference signals and the detection process. By transforming the raw wireless signals into channel response characteristics, the system can detect motion through changes in these responses while filtering out direct noise and interference, thus enabling operation without line-of-sight while managing the harmful factors.
Solution Approach 2:
The patent replaces traditional optical or mechanical motion detection systems with a wireless signal-based system that uses radio frequency reference signals. This substitution allows motion detection without physical line-of-sight requirements by using electromagnetic waves that can penetrate obstacles, thereby solving the line-of-sight limitation while introducing the challenge of wireless interference.
2Measurement precision
If reference signal transmissions are used to detect channel responses, then motion detection precision is improved, but device complexity increases
Solution Approach 1:
The patent segments the motion detection process into distinct functional components: reference signal transmission, channel response determination, quality metric calculation, and motion detection. By dividing the complex task into manageable segments handled by specialized sub-components, the system achieves high precision while organizing complexity in a structured manner that can be implemented efficiently.
Solution Approach 2:
The patent utilizes changes in channel response parameters (such as phase, amplitude, or frequency characteristics) as indicators of motion. By monitoring these parameter variations over time and comparing them against thresholds or patterns, the system achieves precise motion detection. The data processing apparatus implements this by calculating quality metrics based on parameter changes, balancing precision requirements with processing complexity.
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
Enables accurate detection of motion without line-of-sight and reduces noise interference, effectively operating in environments with overlapping frequencies, improving the reliability and precision of motion detection.
Implementation Method 1
A receiver receives wireless signals that are based on multiple transmissions of a reference signal by a transmitter
Implementation Method 2
motion of an object is detected based on changes in the channel response over time
Data Source
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AI summary
In general aspect, motion of an object is detected based on wireless signals. In some aspects, a receiver in a space receives wireless signals; the wireless signals are based on transmissions of a reference signal by a transmitter. Each of the received wireless signals is based on a respective transmission of the reference signal at a distinct time. Channel responses are determined based on the received wireless signals. Each channel response is determined based on a respective one of the received Motion of an object in the space is wireless signals. Motion of an object in the space is detected based on the channel responses.