3D Optical Aperture Synthesis for Vertical Resolution
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Solution Overview
Problem
Current synthetic aperture imaging systems face challenges in achieving comparable resolution in the third dimension for three-dimensional imaging, as they struggle to replicate the cross-range and range resolutions in the vertical direction.
Innovation Solution
An imaging system with two or more apertures separated by a predefined distance in a vertical direction, where a processor determines the phase difference between reflected signals received by these apertures to estimate the height of a target object, enabling the creation of three-dimensional images by moving the platform in a cross-range direction and combining signals to form a synthetic aperture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple apertures are used to determine phase difference and estimate height, then vertical resolution is improved, but device complexity increases
Solution Approach 1:
The multiple apertures serve dual functions: they enable both conventional two-dimensional imaging (range and cross-range) and three-dimensional imaging (vertical extent). The same aperture array used for synthetic aperture imaging in the horizontal plane is also utilized for height estimation by analyzing phase differences, eliminating the need for separate vertical sensing hardware.
Solution Approach 2:
The patent replaces complex mechanical vertical scanning or multiple independent sensing systems with a simpler configuration of spatially separated apertures. By using phase difference analysis of optical signals received at different heights, the system achieves vertical measurement capability without requiring mechanical movement in the vertical direction or complex additional instrumentation.
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
This approach enhances cross-range resolution and allows for accurate determination of the vertical extent of objects, effectively creating detailed three-dimensional images with improved precision and resolution.
Implementation Method 1
The transmitter device may transmit an optical signal via the first aperture in a first direction perpendicular to the predefined direction
Implementation Method 2
The first receiver device may be coupled to the first aperture to receive a first reflected signal in the first direction, via the first aperture, from a target object at a range distance. The second receiver device may be coupled to the second aperture to receive a second reflected signal in the first direction, via the second aperture, from the target object
Implementation Method 3
The processor unit may determine a phase difference between the received first reflected signal and the received second reflected signal. The processor unit may further determine an estimate of a height of the target object in the predefined direction. The height may be determined based on the phase difference and the range distance
Data Source
AI summary
An imaging system includes an imaging platform that has a first aperture and a second aperture that are separated by a separation distance in a predefined direction. The imaging system includes a transmitter device coupled to the first aperture that transmits an optical signal via the first aperture in a first direction perpendicular to the predefined direction. A first receiver of the imaging system receives, via the first aperture, a first reflected signal in the first direction from a target object at a range distance. A second receiver of the imaging system receives, via the second aperture, a second reflected signal in the first direction from the target object. A processor unit of the imaging system determines a phase difference between the first and second reflected signals. The processor unit also determines an estimate of a height of the target object based on the phase difference and the range distance.