Radar Detection of Concealed Objects Using Resonant Scattering
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Solution Overview
Problem
Current radio frequency (RF) detection systems for concealed objects are computationally expensive, time-consuming, and prone to false alarms, with high power transmission posing radiation hazards and low detection probabilities at tactical ranges.
Innovation Solution
A method and system that utilize RF scattering responses to detect concealed objects by measuring mean signal levels in predetermined frequency bands, distinguishing between resonance and non-resonance signatures, and employing low-power RF energy with horizontal and vertical polarizations to achieve real-time detection without exposing personnel to high RF radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If millimeter wave or terahertz radar systems are used for high-resolution imaging, then detection precision is improved, but power consumption increases and radiation hazards occur due to high power transmission requirements
Solution Approach 1:
The patent changes the operating frequency parameter from millimeter wave/terahertz ranges to lower frequency bands, which reduces propagation loss and allows operation at lower power levels while maintaining detection capability through resonant scattering response analysis
Solution Approach 2:
The patent replaces high-power continuous wave radar with low-power pulsed radar system that uses signal processing and resonant frequency analysis to achieve detection, substituting mechanical/power-intensive approach with signal-processing-intensive approach
2Measurement precision
If millimeter wave or terahertz radar systems are used for high-resolution imaging, then detection precision is improved, but the system complexity and computational cost increase
Solution Approach 1:
The patent extracts and analyzes only the resonant scattering response characteristics from the radar signal, separating the detection task from full high-resolution imaging processing, thereby reducing computational complexity while maintaining detection precision
Solution Approach 2:
The patent segments the frequency spectrum into specific bands and analyzes resonant responses at discrete frequencies, breaking down the complex continuous spectrum analysis into manageable discrete frequency points
3Length of stationary object
If high power RF transmission is used to overcome propagation loss at tactical ranges, then detection range is improved, but radiation hazards to personnel increase
Solution Approach 1:
The patent changes the operating frequency to lower bands with reduced propagation loss, enabling tactical range detection with lower transmit power, thereby maintaining detection range while reducing radiation hazard to acceptable levels
Solution Approach 2:
The patent employs pulsed radar operation instead of continuous wave transmission, delivering energy in periodic pulses that reduce average power exposure and radiation hazard while maintaining peak power for adequate detection range
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 provides a low-cost, low-power solution with high detection probability and low false alarm rates, enabling real-time detection of concealed objects at tactical ranges while minimizing radiation risks.
Implementation Method 1
capturing a signal corresponding to a scattered RF energy reflected from the target
Implementation Method 2
The first frequency band may be a frequency range in which the concealed material has a resonant RF scattering response
Data Source
AI summary
A method for detecting a concealed material in a target comprising a body and the concealed material, the method comprising: emitting radio frequency (RF) energy toward a direction of the target, capturing a signal corresponding to a scattered RF energy reflected from the target, measuring a first mean signal level in a first frequency band of the signal, measuring a second mean signal level in a second frequency band of the signal, and detecting the concealed material when the difference between the first mean signal level and the second mean signal level is above a threshold.