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W-band sparse synthetic aperture for computational imaging.
Optics Express
|May 4, 2016
Summary
This study introduces a W-band sparse synthetic-aperture imaging system for high-resolution 2D/3D object reconstruction. The system achieves millimeter-level resolution, advancing computational imaging techniques.
Area of Science:
- Electromagnetics and Applied Physics
- Computational Imaging
- Microwave Engineering
Background:
- Synthetic-aperture imaging systems offer high-resolution capabilities.
- W-band frequencies enable compact system design and high bandwidth.
- Sub-harmonic mixers are crucial components in advanced radar systems.
Purpose of the Study:
- To develop and demonstrate a sparse synthetic-aperture active imaging system operating at W-band.
- To achieve high-resolution imaging of 2D and 3D objects using computational techniques.
- To introduce an information-based metric for evaluating imaging system performance.
Main Methods:
- Utilized a sparse synthetic-aperture system with mechanical receiver scanning at W-band (75-110 GHz).
- Employed sub-harmonic mixer modules and a vector network analyzer for backend detection.
- Developed a full-wave forward model and solved the inverse problem using least squares for image reconstruction.
Main Results:
- Demonstrated far-field, diffraction-limited imaging of 2D and 3D objects.
- Achieved a cross-range resolution of 3 mm and a depth-range resolution of 4 mm.
- Developed and validated an information-based metric for computational imaging system performance.
Conclusions:
- The developed W-band system successfully achieves high-resolution imaging.
- The information-based metric aids in optimizing system parameters like radiating element gain.
- This work contributes to advancements in computational imaging and radar systems.
