Synthetic Aperture Radar Imaging for Security Scanning
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Solution Overview
Problem
Existing methods for imaging test objects using electromagnetic waves, such as millimeter waves, are complex, expensive, and limited in resolution and depth information, particularly when checking for suspicious objects like weapons or explosives.
Innovation Solution
A method utilizing a synthetic aperture principle with spatially bundled waves and moveable virtual antennas to enable high-resolution two-dimensional imaging without complex antenna controls, allowing for efficient and cost-effective scanning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a beam deflection system with phase-shifted antenna field is used, then the imaging capability is improved, but the device complexity and cost increase significantly
Solution Approach 1:
The patent creates a virtual antenna field that copies the functionality of a complex phase-shifted antenna system without requiring actual phase-shifting hardware. By mathematically synthesizing the antenna patterns and processing the received signals accordingly, the system achieves the same imaging capability as a complex physical antenna array would provide, but with a much simpler single-antenna or reduced-antenna configuration.
Solution Approach 2:
The patent replaces the mechanical/electrical phase-shifting mechanism with signal processing operations. Instead of physically adjusting antenna phases through complex hardware controls, the system uses computational methods to achieve beam deflection and focusing, substituting mechanical complexity with algorithmic processing.
2Device complexity
If a conventional antenna field geometry is used, then the system structure is simple, but the frequency range is limited and resolution is insufficient
Solution Approach 1:
The patent introduces dynamic beam steering capabilities through signal processing, allowing the virtual antenna pattern to be electronically reconfigured without changing the physical antenna geometry. This enables the system to adapt to different imaging requirements, frequencies, and resolution needs while maintaining a simple fixed antenna structure.
Solution Approach 2:
The patent changes the effective parameters of the antenna system through signal processing rather than physical modification. By manipulating the received signals to create virtual antenna patterns with different effective apertures, frequencies, and orientations, the system achieves variable imaging parameters without altering the actual antenna hardware.
3Reliability
If successive circumferential illumination with millimeter waves is used, then suspicious objects can be detected, but the scanning time and process complexity increase
Solution Approach 1:
The patent performs preliminary signal processing and virtual antenna pattern synthesis during the data acquisition phase, preparing the data in a format that enables rapid reconstruction. By pre-processing the raw signals to extract relevant scattering information and organize it according to virtual antenna positions, the system reduces the computational burden during image reconstruction, thereby reducing total scanning time.
Solution Approach 2:
The patent uses multiple virtual antennas that simultaneously sample different spatial positions, effectively copying the measurement process across multiple locations in the synthetic aperture. This parallel virtual sampling reduces the time required compared to sequentially illuminating each position with a single physical antenna.
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 high-resolution imaging in both X and Y directions, providing satisfactory depth information and simplifying the scanning process, making it suitable for detecting suspicious objects effectively.
Implementation Method 1
the test object is illuminated with electromagnetic waves and the scattered waves are received
Implementation Method 2
the scattered waves are received and for a pictorial representation of the test object using the synthetic aperture principle (SAR) are evaluated
Data Source
Figure 1~3
Figure 3a~4
Figure 5~6
AI summary
A method for imaging test objects by means of electromagnetic waves, in particular for the purpose of checking individuals for suspicious articles, in which method the test object is illuminated by electromagnetic waves, the scattered waves are received and evaluated for an imaginal representation of the test object on the basis of the synthetic aperture principle (SAR). A synthetic aperture is produced by the waves output by an antenna (1) being concentrated initially in spatial terms, the point (5) of high concentration being moved on a reflector (4) along a circle.