Portable SAR Imaging Internal Building Features
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Solution Overview
Problem
Conventional synthetic aperture radars are not suited for tracking terrorist movements within buildings in small towns or neighborhoods due to their large size and inability to effectively generate imagery of internal features.
Innovation Solution
A synthetic aperture radar system with multiple antenna elements having differing vertical spatial separation, configured on a portable platform, transmits and receives radio-frequency signals to process phase variations and generate imagery of internal building features, including differentiation between multiple floors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional synthetic aperture radars are used, then they can generate imagery of targets, but they are too large and cannot effectively generate imagery of internal features of buildings
Solution Approach 1:
The radar system is divided into multiple antenna elements arranged in a specific geometry (e.g., tetrahedral configuration with elements at different heights). This segmentation allows the system to capture phase variations from different spatial positions, enabling both compact form factor and high-resolution imagery of internal building features through interferometric processing
Solution Approach 2:
The patent introduces vertical dimension by positioning antenna elements at different heights (e.g., elements at 0m, 1.5m, 3m, 4.5m elevations). This multi-dimensional antenna arrangement enables the radar to detect phase variations corresponding to different floors and internal features, achieving high-resolution imagery without requiring a large horizontal aperture
2Adaptability or versatility
If conventional synthetic aperture radars are used, then they can operate in various environments, but they cannot differentiate between multiple floors or internal features of buildings
Solution Approach 1:
The antenna array is segmented into elements at distinct vertical positions, allowing the system to capture phase information from different elevations. This enables differentiation of internal features on multiple floors while maintaining environmental adaptability through the portable platform design
Solution Approach 2:
The patent uses phase variation as an intermediary to extract vertical information. By measuring phase differences in signals received by vertically-separated antenna elements, the system can infer the vertical positions of internal features (walls, floors, objects) without direct line-of-sight, preserving information about building structure in various environments
3Measurement precision
If multiple antenna elements with vertical separation are used, then imagery of internal building features can be generated, but the device complexity increases
Solution Approach 1:
Multiple antenna elements are combined into a coherent array with specific geometric relationships (e.g., tetrahedral configuration). By merging the signals from these elements through interferometric processing, the system achieves high vertical resolution for imaging internal features while managing complexity through systematic signal combination rather than independent processing of each element
Solution Approach 2:
The patent transitions from two-dimensional horizontal antenna arrays to three-dimensional configurations with vertical separation. This adds the vertical dimension to the aperture, enabling resolution of internal features at different heights without proportionally increasing the number of elements, thus managing complexity while improving measurement precision
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
Enables the generation of high-resolution imagery of internal building features, including vertical characteristics, allowing for effective tracking of movements and activities within buildings, even in challenging environments.
Implementation Method 1
the image processing application generates imagery of the stationary object according to phase variations in the plurality of received radio-frequency signals
Implementation Method 2
receive multiple reflected radio-frequency signals from one or more internal features of the building
Data Source
AI summary
According to one embodiment, a radar includes multiple antenna elements coupled to an image processing application. The antenna elements have a differing vertical spatial separation relative to one another and are configured to transmit a radio-frequency signal toward a stationary object and receive multiple reflected radio-frequency signals from one or more internal features of the building. The image processing application receives the reflected radio-frequency signals as the antenna elements are moved horizontally with respect to the stationary object. From these reflected radio-frequency signals, the image processing application generates imagery of the stationary object according to phase variations in the plurality of received radio-frequency signals. The imagery depicting vertical characteristics of the one or more internal features of the building.