Single-Antenna Doppler Motion Detection Circuit
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Solution Overview
Problem
Existing motion detection technologies, such as motion sensors and Doppler shift detection circuits, require additional installation and may not provide accurate and prompt detection of various objects in diverse environments, including large rooms, outdoor spaces, and multiple rooms.
Innovation Solution
A circuit comprising a transmission chain with a power amplifier, a sensing circuit, and a single antenna, configured to transmit and receive wireless signals, which generates a modulation signal containing a Doppler shift caused by object motion, allowing for the detection of motion through signal envelope extraction and processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If motion sensors and proximity sensors are installed to detect object motion, then motion detection capability is provided, but additional installation is required and accurate detection of various objects in diverse environments is not achieved
Solution Approach 1:
The patent applies universality by enabling a single antenna to perform multiple functions: transmitting continuous wave signals, receiving reflected signals, and detecting motion through Doppler shift analysis. This eliminates the need for separate motion sensors and proximity sensors, resolving the contradiction between detection reliability and device complexity
Solution Approach 2:
The system applies self-service by using its own transmitted signal as the reference for Doppler shift detection. The antenna transmits continuous wave signals and uses the reflected signals from objects to detect motion, eliminating the need for external sensor installations while maintaining accurate detection across diverse environments
2Measurement precision
If Doppler shift detection circuits are installed to detect object motion and position, then Doppler shift detection is provided, but additional installation is required and applicability to various environments is limited
Solution Approach 1:
The patent merges the transmission chain and sensing circuit into an integrated system that shares a single antenna. The sensing circuit combines the continuous wave signal and reflected signal to generate modulation signals containing Doppler shift information, eliminating the need for separate Doppler shift detection circuit installations while maintaining measurement precision
Solution Approach 2:
The integrated circuit performs multiple functions: signal transmission, signal reception, Doppler shift detection, and position determination using a single antenna. This multi-functionality resolves the contradiction by providing accurate Doppler shift detection without requiring additional circuit installations that would limit environmental applicability
3Adaptability or versatility
If multiple sensors and devices are installed to achieve accurate motion detection in diverse environments, then detection accuracy is improved, but the complexity and cost of installation increases
Solution Approach 1:
The patent achieves environmental versatility through a universal antenna system that can detect motion and position in various settings (indoor, outdoor, large rooms, open spaces) using a single integrated circuit. This eliminates the need for environment-specific sensor installations, resolving the contradiction between adaptability and installation 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
This solution enables accurate and efficient detection of object motion in various environments without the need for extensive sensor installation, utilizing a single antenna and integrated circuit components to process Doppler shift-induced signal variations.
Implementation Method 1
The sensing circuit is configured to obtain a modulation signal by combining the continuous wave signal and the incoming signal, wherein the modulation signal contains a Doppler shift caused by the motion of the object
Data Source
AI summary
A circuit for detecting motion of an object in an environment. The circuit comprises a transmission chain, an envelope extraction circuit, and a detector circuit. The transmission chain includes a power amplifier, a sensing circuit, and a single antenna. By the single antenna, a first wireless signal related to a transmission signal is transmitted. The transmission signal is a continuous wave signal. The single antenna can receive a second wireless signal as an incoming signal. The second wireless signal is a reflected first wireless signal from the object. The sensing circuit can obtain a modulation signal by combining the continuous wave signal and the incoming signal. The modulation signal contains a Doppler shift caused by the motion of the object. The envelope extraction circuit can extract a signal envelope from the modulation signal. The detector circuit can determine the motion of the object according to the signal envelope.