Handheld Through-Wall SAR Imaging for Hidden Target Detection
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Solution Overview
Problem
Current through-wall detection systems are large, heavy, and require complex operation, making them unsuitable for handheld use by first responders, and lack the ability to easily distinguish between normal spaces and hidden compartments.
Innovation Solution
A handheld through-wall detection system using a synthetic aperture radar (SAR) with a linear frequency-modulated continuous-wave (LFMCW) time-division multiple access (TDMA) multi-input multi-output (MIMO) configuration, combined with a laser range finder and mobile device processing, to generate 2-dimensional SAR images and detect targets behind walls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current through-wall detection systems are used, then detection capability is provided, but device size and weight increase
Solution Approach 1:
The system divides the detection function into separate modules: a compact SAR module for signal processing, a laser range finder for distance measurement, and a mobile device for data processing and display. This segmentation allows each component to be optimized independently, reducing overall device weight while maintaining detection capability.
Solution Approach 2:
The patent introduces a mobile device as an intermediary between the SAR module and the final user interface. The mobile device handles complex data processing and display functions, allowing the SAR module to remain compact while still providing sophisticated detection capabilities through wireless communication.
2Reliability
If current through-wall detection systems are used, then detection capability is provided, but operational complexity increases
Solution Approach 1:
The system automatically performs signal processing, target detection, and location identification without requiring manual intervention. The mobile device automatically processes SAR data, generates 2D images, and displays results, eliminating the need for users to perform complex manual operations while maintaining high detection capability.
Solution Approach 2:
The system provides real-time feedback through automated processing and display of detection results on the mobile device. The laser range finder continuously measures distance and feeds this information back to the SAR processing, enabling automatic adjustment and optimization of detection parameters without user intervention.
3Reliability
If current through-wall detection systems are used, then detection capability is provided, but training requirement increases
Solution Approach 1:
The system performs all complex processing functions automatically, including signal processing, target detection, and location identification. This self-service approach eliminates the need for users to learn complex operating procedures or signal processing techniques, reducing training requirements while maintaining sophisticated detection capability.
Solution Approach 2:
The mobile device creates visual copies (2D images) of the SAR data for easy interpretation by users. Instead of requiring users to understand complex radar signals, the system converts them into intuitive visual representations that can be easily interpreted without extensive training.
4Reliability
If available through-wall systems are used, then detection capability is provided, but working range is limited
Solution Approach 1:
The patent combines SAR technology with laser range finding and mobile device processing to create a hybrid system that extends working range. The laser range finder provides precise distance measurement to calibrate the SAR system, enabling accurate detection at extended ranges while maintaining compact form factor.
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 compact, user-friendly solution capable of detecting hidden objects with high resolution and accuracy, allowing first responders to easily identify and locate targets through walls with minimal training.
Implementation Method 1
a synthetic aperture radar (SAR), configured to scan an area of interest behind a wall to obtain SAR scanning data
Implementation Method 2
a laser range finder, configured to estimate a distance between the SAR and the wall
Data Source
AI summary
The present disclosure provides a through-wall detection system and a through-wall detection method. The through-wall detection system includes a synthetic aperture radar (SAR), configured to scan an area of interest behind a wall to obtain SAR scanning data, where the SAR includes a linear frequency-modulated continuous-wave (LFMCW) time-division multiple access (TDMA) multi-input multi-output (MIMO) SAR; a laser range finder, configured to estimate a distance between the SAR and the wall; and further include a mobile device. A data processor is configured to pre-process SAR scanning data of all Tx-Rx antenna pairs and transfer pre-processed SAR scanning data of all Tx-Rx antenna pairs to the mobile device; and the mobile device is configured to process the pre-processed SAR scanning data of all Tx-Rx antenna pairs to generate a 2-dimensional SAR image and determine presence or absence of a target in the area of interest behind the wall.