Study of the image motion compensation method for a vertical orbit dynamic scanning TDICCD space camera

Area of Science:

• Aerospace Engineering
• Optical Imaging Systems
• Satellite Technology

Background:

• Low Earth-orbit satellites utilize dynamic vertical orbit scanning imaging with double-sided mirrors.
• Inconsistencies in scanning direction and satellite orbit cause mismatches between TDI charge transfer speed and target speed.
• This mismatch degrades image quality due to uncompensated image motion.

Purpose of the Study:

• To propose a collaborative compensation method for low-dimensional attitude maneuvering and TDICCD line-frequency matching.
• To address the speed mismatch issue in satellite-based dynamic scanning imaging.
• To improve the image quality of TDICCD systems during satellite maneuvers.

Main Methods:

• Developed a collaborative compensation method integrating attitude maneuvering and TDICCD line-frequency matching.
• Validated and analyzed a coordinate system transformation model to correct speed discrepancies.
• Implemented the compensation to synchronize TDI charge transfer with target motion.

Main Results:

• Reduced image motion per unit exposure time from 0.619µm to 0.023µm.
• Achieved a significant decrease in image motion compared to uncompensated maneuver modes.
• Demonstrated noticeably higher image quality in the compensated TDICCD system.

Conclusions:

• The proposed collaborative compensation method effectively mitigates speed mismatch in TDICCD imaging for satellites.
• The technique significantly enhances image quality by reducing motion blur.
• This advancement is crucial for high-resolution dynamic scanning applications in low Earth-orbit satellite missions.