Multi-Antenna Doppler Radar Occupancy Detection
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Solution Overview
Problem
Conventional Doppler radar motion detection systems suffer from false positive detection and failure to detect minor movements, leading to inaccurate sensing of a person's presence in a room.
Innovation Solution
The use of multiple antennas with different beam widths and motion detection parameters in distinct regions within a space allows for more precise detection by controlling transmit power and trigger levels, enabling accurate differentiation between large and minor motions, and reducing false positives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single Doppler radar sensor is used for motion detection, then the device complexity is low, but false positive detection occurs and minor movements are not detected
Solution Approach 1:
The detection space is divided into multiple regions (first region, second region, third region) with different sensitivity levels. The first antenna monitors large motions in the first region, the second antenna monitors minor motions in the second region, and the third antenna monitors the third region. This spatial segmentation allows the system to detect both large and minor movements while reducing false positives from distant motions.
Solution Approach 2:
Different antennas are configured with different beam widths and detection parameters tailored to their specific monitoring regions. The first antenna uses a first beam width and first motion detection parameter for large motions, the second antenna uses a second beam width and second motion detection parameter for minor motions, and the third antenna uses a third beam width and third motion detection parameter. This local optimization of detection characteristics improves overall reliability.
2Measurement precision
If the motion detection parameter is set to detect minor movements, then detection sensitivity increases, but false positive detection from distant motions increases
Solution Approach 1:
The detection space is segmented into multiple regions with different sensitivity requirements. The second antenna monitors a second region for minor motions using a second motion detection parameter, while the first antenna monitors a first region for large motions using a first motion detection parameter. This segmentation allows high sensitivity detection without false positives from distant motions.
Solution Approach 2:
Each antenna is configured with local detection parameters optimized for its monitoring region. The second antenna uses a second beam width and second motion detection parameter specifically tuned for detecting minor motions in the second region, while the first antenna uses different parameters for large motions in the first region. This local optimization enables precise detection without false positives.
3Measurement precision
If multiple antennas with different beam widths are used to distinguish large and minor motions, then detection accuracy improves, but device complexity increases
Solution Approach 1:
The antenna system is segmented into three antennas, each responsible for monitoring a specific region with specific motion types. The first antenna monitors large motions in the first region, the second antenna monitors minor motions in the second region, and the third antenna monitors the third region. This functional segmentation enables accurate motion differentiation while keeping the system architecture manageable.
Solution Approach 2:
The multiple antennas share common functional characteristics - they all use Doppler radar technology and are controlled by a single controller that applies consistent detection logic. This universality in underlying technology and control approach simplifies the overall system complexity despite having multiple antennas with different beam widths and parameters.
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 enhances the accuracy of motion sensing by effectively distinguishing between occupancy and non-occupancy states, reducing false positives and ensuring that minor movements are detected, thereby improving the reliability of motion detection systems.
Implementation Method 1
monitoring for a first motion in a first region using a first antenna using a first motion detection parameter
Implementation Method 2
extract from the obtained electric signal a component of a frequency band corresponding to a moving speed of a person due to Doppler effect
Data Source
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AI summary
A motion sensing method includes monitoring for a first motion in a first region (210, 1010, 1110, 1210, 1310, 1410, 1510, 1610, 1710) using a first antenna (310, 680, 780, 880, 980, 1080, 1180, 1280, 1380, 1480, 1580, 1680, 1780) using a first motion detection parameter, when no first motion is sensed by the monitoring using the first antenna (310, 680, 780, 880, 980, 1080, 1180, 1280, 1380, 1480, 1580, 1680, 1780), monitoring for a second motion in a second region (220, 1020, 1120, 1220, 1320, 1420, 1520, 1620, 1720) using a second antenna (320, 690, 790, 890, 990, 1090, 1190, 1290, 1390, 1490, 1590, 1690, 1790) using a second motion detection parameter, and when no second motion is sensed by monitoring using the second antenna (320, 690, 790, 890, 990, 1090, 1190, 1290, 1390, 1490, 1590, 1690, 1790), designating a space, which encompasses the second region (220, 1020, 1120, 1220, 1320, 1420, 1520, 1620, 1720), as unoccupied, wherein the first region (210, 1010, 1110, 1210, 1310, 1410, 1510, 1610, 1710) and the second region (220, 1020, 1120, 1220, 1320, 1420, 1520, 1620, 1720) overlap one another, and the first motion detection parameter is different from the second motion detection parameter.