Impulse Electromagnetic Wave People Counting
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Solution Overview
Problem
Conventional people counting methods, such as those using cameras, often fail to accurately count individuals in various environments, especially in areas like those near accidents or blackouts, and can make people feel uncomfortable.
Innovation Solution
A people counting method and apparatus that uses impulse electromagnetic waves to radiate and receive reflection signals, with signal strength being proportional to the number of people, allowing for accurate counting regardless of the environment and without the discomfort of camera-based systems. This involves a wireless transceiver with a phased-array antenna and a controller that compensates for signal weakening over time, determining the number of people based on signal strength thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If camera-based facial recognition technology is used to count people in a target area, then people counting capability is provided, but the system fails to operate accurately in adverse environments (fire, blackout, accident areas) and makes people feel uncomfortable
Solution Approach 1:
The patent replaces the optical camera-based detection system with an electromagnetic wave-based detection system. Specifically, it uses impulse electromagnetic waves in the ultra-wideband frequency range to detect people through measurement of reflection signal characteristics, eliminating the environmental limitations of optical systems while maintaining non-contact operation.
Solution Approach 2:
The patent changes the detection parameter from optical reflection (camera) to electromagnetic wave reflection (ultra-wideband signal). By measuring the strength and characteristics of reflected electromagnetic waves rather than optical images, the system achieves reliable operation in adverse environmental conditions including fire, blackout, and accident areas.
2Measurement precision
If camera-based facial recognition is used, then people counting function is achieved, but measurement accuracy deteriorates in adverse environmental conditions
Solution Approach 1:
The patent replaces the optical camera-based detection system with an electromagnetic wave-based detection system. Specifically, it uses impulse electromagnetic waves in the ultra-wideband frequency range to detect people through measurement of reflection signal characteristics, eliminating the environmental limitations of optical systems while maintaining non-contact operation.
Solution Approach 2:
The patent changes the detection parameter from optical reflection (camera) to electromagnetic wave reflection (ultra-wideband signal). By measuring the strength and characteristics of reflected electromagnetic waves rather than optical images, the system achieves reliable operation in adverse environmental conditions including fire, blackout, and accident areas.
3Measurement precision
If signal strength measurement is performed over reception time period, then people counting is enabled, but signal strength weakens in proportion to reception time period requiring compensation
Solution Approach 1:
The patent applies preliminary compensation for signal attenuation based on the reception time period. By calculating the expected signal weakening due to time delay and compensating for it in advance, the system maintains accurate signal strength measurements despite the natural attenuation that occurs over the reception time period.
Solution Approach 2:
The patent uses feedback from the reception time period information to adjust the signal strength measurement. The system measures both the signal strength and the reception time, then uses the time information as feedback to compensate for the expected attenuation, thereby obtaining the accurate reflected signal strength characteristic of the detected object.
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 people counting in any environment, including areas with obstacles or emergencies, without causing discomfort, and improves accuracy through repeated measurements and phased-array antenna technology.
Implementation Method 1
an impulse electromagnetic wave may be radiated to the target area and a reflection signal may be received from the target area
Implementation Method 2
a phase-array antenna may be used to receive the reflection signal from the target area
Data Source
AI summary
An apparatus configured to count people in a target area includes a wireless transceiver and a controller. The wireless transceiver is configured to radiate an impulse electromagnetic wave to the target area and receive a reflection signal from the target area, and the controller is configured to obtain a signal strength of the reflection signal over a reception time period during which the reflection signal is received and count people according to the signal strength, considering that the signal strength is weakened in proportion to the reception time period.