Ultra-High Resolution Imaging Method for Distributed Small Satellite Spotlight MIMO-SAR Based on Sub-Aperture Image...

Area of Science:

• Earth and Space Sciences
• Electrical Engineering
• Remote Sensing Technology

Background:

• Small satellite synthetic aperture radar (SAR) systems offer advantages like rapid deployment and lower costs, driving their adoption in remote sensing.
• Distributed small satellite multiple-input multiple-output (MIMO) SAR research remains less explored despite the potential for enhanced imaging capabilities.
• Current limitations in resolution hinder the full potential of small satellite SAR systems for detailed terrestrial observation.

Purpose of the Study:

• To propose an novel ultra-high resolution imaging method for distributed small satellite spotlight MIMO-SAR.
• To address the research gap in high-resolution imaging techniques for small satellite MIMO SAR constellations.
• To enhance the imaging performance of small satellite SAR systems for detailed applications.

Main Methods:

• The proposed method utilizes sub-aperture division and coherent fusion algorithms tailored for MIMO SAR.
• An improved time-domain bandwidth synthesis (TBS) technique is employed to achieve a large signal bandwidth after deblurring sub-aperture data.
• Sub-aperture images are coherently fused to reconstruct an ultra-high resolution final image.

Main Results:

• The developed method successfully achieves ultra-high resolution imaging for distributed small satellite spotlight MIMO-SAR.
• Deblurring and bandwidth synthesis techniques effectively increase the signal bandwidth for improved resolution.
• Coherent fusion of sub-aperture images yields a high-fidelity, ultra-high resolution output.

Conclusions:

• The proposed ultra-high resolution imaging method is feasible and effective for distributed small satellite MIMO-SAR.
• This technique advances the capabilities of small satellite SAR for high-detail remote sensing applications.
• The study validates the potential of sub-aperture processing and fusion for enhancing SAR imaging resolution.