Microwave Sensor False Alarm Reduction via Biological Signal Detection
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Solution Overview
Problem
Conventional Doppler radar systems face issues with high false report rates and complex, costly circuits due to environmental interference and limited sensing distances, especially in detecting biological signals from intruding objects.
Innovation Solution
A security surveillance microwave sensor system utilizing a pair of Doppler radars with voltage-controlled oscillators and signal processing units to convert IF signals into DC voltage levels for comparison, reducing false alarms and simplifying circuitry by using RF transceiver modules for biological signal detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional Doppler radar is used for security surveillance, then detection capability is provided, but false report rate increases due to environmental interference
Solution Approach 1:
The patent implements a feedback mechanism where the sensor continuously monitors environmental conditions and adjusts its operation accordingly. The controller receives feedback about environmental interference levels and modifies detection parameters or triggers additional verification processes when interference is detected, thereby reducing false reports while maintaining detection capability.
Solution Approach 2:
The patent introduces an intermediary processing layer between the raw sensor detection and the final alarm output. This intermediary controller analyzes detection signals in context of environmental conditions and determines whether to trigger alerts, acting as a mediator that filters out false positives caused by environmental factors while preserving genuine threat detections.
2Ease of manufacture
If conventional Doppler radar circuits are used, then signal detection is achieved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts the essential detection function from complex conventional radar circuits and implements it using simplified sensor elements combined with a microcontroller. By separating the simple sensing function from the complex signal processing, the system achieves detection capability with much lower circuit complexity and manufacturing cost.
Solution Approach 2:
The patent replaces complex electromagnetic radar circuitry with a simpler sensor-based system controlled by a microcontroller. This substitution of mechanical/electronic complexity with programmable control logic reduces both device complexity and manufacturing costs while maintaining detection functionality.
3Length of stationary object
If conventional sensors are used for intrusion detection, then basic detection is provided, but sensing distance is limited
Solution Approach 1:
The patent merges multiple detection capabilities into a single integrated system. By combining the sensor array with a microcontroller that implements sophisticated signal processing and pattern recognition, the system extends sensing distance while maintaining detection accuracy through coordinated operation of multiple components.
Solution Approach 2:
The patent transitions from simple proximity detection to multi-dimensional monitoring by implementing temporal analysis of detection patterns and spatial distribution of sensor signals. This dimensional expansion allows the system to detect targets at greater distances while maintaining precision through pattern recognition across multiple dimensions.
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
The system effectively reduces false report rates and extends monitoring distances by distinguishing between normal and malfunctioning states, improving usability and reducing manufacturing costs through precise signal processing and double-checking of security signals.
Implementation Method 1
a microwave signal of, for example, 24 to 24.25 GHz generated by the VCO in the transceiver is output through the Tx antenna, and the output microwave signal is reflected by a target such as a human body or an object and received through the Rx antenna
Implementation Method 2
Doppler radar uses the Doppler effect of radio waves to detect a moving target based on the difference between the frequency of radar waves transmitted toward a target object and the frequency of reflected radio waves
Data Source
AI summary
The present invention relates to a security surveillance microwave sensor having a reduced false report rate by means of biological signal detection, which monitors and determines a malfunction state or a false alarm generated by environmental factors by detecting humans, animals or objects approaching within a predetermined distance using a microwave signal. The present invention may extend the monitoring distance of security surveillance, set an IF frequency band disturbed by a human body, amplify the IF frequency or use a change in the voltage level to extend the monitoring distance, manage a monitoring state by double-checking transmission and reception of security signals, and reduce the false report rate by distinguishing the false alarms or the malfunction state of the sensor.