Micro-Impulse Radar for Non-Invasive Stress Detection
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Solution Overview
Problem
Current surveillance systems lack the capability to effectively detect and predict human stress conditions, such as anxiety or physical distress, in a non-invasive and efficient manner, which is crucial for security and health monitoring applications.
Innovation Solution
A micro-impulse radar (MIR) system is used to probe a region and produce signals that are decoded to extract physiological attributes, correlating them with predicted stress conditions, allowing for real-time notification and tracking of individuals exhibiting anomalous stress levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional surveillance systems are used, then basic monitoring is achieved, but detection of human stress conditions is not possible
Solution Approach 1:
The patent replaces traditional mechanical/optical surveillance systems with a micro-impulse radar system that uses electromagnetic waves to detect physiological signals. The radar system measures minute movements of body parts (chest, abdomen) caused by respiratory and cardiac activities, enabling stress condition detection without direct contact or complex optical systems.
Solution Approach 2:
The patent uses radar signals as an intermediary to indirectly measure physiological parameters. Instead of directly measuring stress conditions, the system detects respiratory rate and heart rate through radar-induced micro-movements, then correlates these physiological parameters to infer stress states, providing a non-invasive measurement approach.
2Ease of operation
If non-invasive detection methods are used, then subject comfort is improved, but measurement precision for stress detection deteriorates
Solution Approach 1:
The patent employs dynamic signal processing techniques to extract physiological information from continuously varying radar return signals. The system processes time-varying micro-movements of body parts during respiration and cardiac cycles, using spectral analysis and pattern recognition to accurately determine respiratory rate, heart rate, and their variability, which are indicators of stress conditions.
Solution Approach 2:
The patent performs preliminary calibration and baseline establishment by collecting physiological data during normal, non-stressful states. This baseline information is stored and used for comparison during actual stress detection, improving accuracy by accounting for individual variations and environmental factors before formal measurement begins.
3Loss of time
If real-time stress monitoring is implemented, then security response time is improved, but energy consumption increases
Solution Approach 1:
The patent uses periodic impulse radar transmission instead of continuous wave transmission. The radar emits short pulses at regular intervals and processes the return signals during the intervals between pulses. This periodic operation reduces average power consumption while maintaining real-time detection capability through efficient signal processing of the pulsed returns.
Solution Approach 2:
The patent implements adaptive signal processing where the system automatically adjusts its operation based on detected signal quality and target presence. When no target is present or signal quality is sufficient, the system reduces transmission frequency or power. The processed signals also self-calibrate by using the detected physiological rhythms as reference, reducing need for external calibration energy.
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 MIR system enables accurate detection and prediction of human stress conditions, enhancing security by identifying potential threats and improving health monitoring by alerting authorities or aid personnel, thereby improving safety and assistance.
Implementation Method 1
a micro-impulse radar (MIR) configured to survey a region
Implementation Method 2
probing a region with a MIR to produce a MIR signal
Data Source
AI summary
One or more computers are configured to determine a human stress condition corresponding to one or more physical or physiological parameters extracted from one or more micro-impulse radar (MIR) signals.