UWB Radar Enclosure With Absorbing Material for Noise Reduction
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Solution Overview
Problem
Current ultra-wideband (UWB) systems for weapon and object detection face challenges such as high costs, bottlenecks in security screening, ineffective threat identification, privacy concerns, and reduced signal-to-noise ratios due to noise from off-directional emissions and environmental factors, making them impractical for large public events and venues with limited resources.
Innovation Solution
A UWB system configuration that includes a transmitter array within an enclosure with radar absorbing materials to mitigate noise from back and side lobes, combined with a pattern recognition device using a convolutional neural network (CNN) for object detection, allowing for covert and efficient scanning through walls and common materials, and capable of identifying objects without requiring multiple arrays or additional imaging systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional metal detectors and x-ray systems are used for security screening, then threat detection capability is improved, but screening efficiency and throughput deteriorate due to bottlenecks and manual inspection requirements
Solution Approach 1:
The patent replaces traditional mechanical metal detectors and manual x-ray inspection systems with an ultra-wideband radar system that automatically detects concealed objects through electromagnetic wave reflection. The radar system uses signal processing algorithms to identify weapons and contraband without requiring physical contact or manual intervention, thereby maintaining high detection reliability while dramatically improving screening throughput and eliminating bottlenecks.
Solution Approach 2:
The patent introduces an ultra-wideband radar system as an intermediary between the screened individual and the detection system. The radar waves penetrate clothing and non-metallic materials to detect concealed objects, serving as a mediator that provides accurate threat detection without requiring direct visual inspection or physical search, thus maintaining security effectiveness while reducing manual intervention and improving screening efficiency.
2Measurement precision
If multiple transceivers are used to improve imaging resolution and threat detection, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent divides the radar system into multiple independent transceiver units, each capable of transmitting ultra-wideband pulses and receiving reflected signals. By segmenting the system into distributed transceivers with unique identifier codes, the patent achieves high-resolution imaging through signal combination while keeping each individual transceiver unit simple and cost-effective. The segmentation allows parallel operation and improves detection capability without proportionally increasing overall system complexity.
Solution Approach 2:
The patent designs each transceiver unit to perform multiple functions: transmitting ultra-wideband pulses, receiving reflected signals, identifying other transceivers through coded signals, and processing radar data. This multi-functionality reduces the need for separate specialized components, thereby improving imaging resolution through coordinated multi-transceiver operation while controlling overall device complexity and cost.
3Measurement precision
If transceivers transmit high-power signals to improve detection range and accuracy, then measurement precision is improved, but energy consumption and noise interference increase
Solution Approach 1:
The patent employs periodic transmission of ultra-wideband pulses by each transceiver in a time-synchronized sequence. Instead of continuous high-power transmission, each transceiver transmits short pulses at intervals, allowing energy accumulation through signal integration while maintaining low average power consumption. The periodic action is coordinated with identifier code transmission to ensure accurate signal association and noise rejection, thereby improving detection accuracy without excessive energy consumption.
Solution Approach 2:
The patent implements feedback mechanisms where each transceiver receives identifier codes from other transceivers and adjusts its transmission timing and signal processing accordingly. This feedback enables coordinated pulse transmission that maximizes detection accuracy while minimizing interference and energy consumption. The system uses feedback from received signals to optimize detection parameters and reduce noise, achieving high measurement precision with controlled energy use.
4Measurement precision
If radar absorbing materials are added to reduce noise from back and side lobes, then signal-to-noise ratio is improved, but device complexity and cost increase
Solution Approach 1:
The patent converts the harmful back and side lobes of transmitted radar signals into beneficial information by using radar absorbing materials to suppress these lobes. The materials absorb the off-directional emissions that would otherwise create noise and interference, transforming a harmful electromagnetic radiation pattern into a benefit by significantly improving the signal-to-noise ratio. This approach enhances measurement precision while adding minimal complexity compared to alternative noise reduction methods.
Solution Approach 2:
The patent changes the electromagnetic parameters of the transmission environment by introducing radar absorbing materials with specific dielectric properties. These materials alter the reflection and absorption characteristics of the radar signals, reducing the strength of back and side lobes and improving the overall signal-to-noise ratio. By carefully selecting and positioning materials with appropriate electromagnetic parameters, the system achieves noise reduction without excessive complexity.
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 effective and efficient detection of concealed weapons and objects with low power consumption, minimal signal loss through common materials, and reduced noise interference, enabling secure screening in dynamic environments with minimal disruption to public events and venues.
Implementation Method 1
a radar absorbing material positioned to receive electromagnetic waves transmitted from the transmitter component that are not directed toward the ROI
Implementation Method 2
a transmitter component that transmits electromagnetic waves toward a region-of-interest (ROI)
Implementation Method 3
a receiver component that receives reflected electromagnetic waves from objects in the ROI
Data Source
AI summary
An ultra-wideband (UWB) system includes an enclosure, and an ultra-wideband (UWB) transmitter array within the enclosure, the UWB transmitter array having a transmitter component that transmits electromagnetic waves toward a region-of-interest (ROI), the UWB array having a receiver component that receives reflected electromagnetic waves from objects in the ROI and generates object data. The system further includes a radar absorbing material positioned to receive electromagnetic waves transmitted from the transmitter component that are not directed toward the ROI, and a pattern recognition device having a processor configured to process the electromagnetic waves reflected from the ROI and to determine whether an object-of-interest (OOI) pattern is recognized within the object data.