Satellite Antenna Rotation Profiles to Reduce Image Jitter
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Solution Overview
Problem
Vibration and structural resonance in artificial satellites cause image jitter due to movements, degrading image quality by introducing short-term phase variations in image signals.
Innovation Solution
A method and apparatus for optimizing antenna driving by controlling rotation angle and velocity, generating an optimization profile that minimizes error between basic and optimization profiles, using preset optimization rotation velocities to determine rotation and stop areas, thereby reducing antenna movements and improving image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the antenna rotates continuously to track the ground station, then communication coverage is maintained, but antenna movements cause vibration and image jitter
Solution Approach 1:
The patent applies periodic action by dividing the antenna rotation into discrete processing sections with optimized velocity profiles. Instead of continuous rotation, the antenna follows a periodic pattern of acceleration and deceleration within each processing section, maintaining ground station tracking while reducing vibration-induced image jitter through controlled periodic motion cycles.
Solution Approach 2:
The patent changes the motion parameters of the antenna by optimizing rotation velocity within processing sections. By adjusting velocity parameters to be zero at section boundaries and optimizing the velocity profile within sections, the system maintains communication reliability while minimizing harmful vibrations that cause image jitter.
2Productivity
If the antenna rotation velocity is increased to improve communication efficiency, then productivity increases, but vibration and image jitter worsen
Solution Approach 1:
The patent applies dynamics by making the antenna rotation velocity variable rather than constant. The system dynamically adjusts velocity within processing sections, optimizing it to maintain communication efficiency while reducing vibration. The velocity profile changes dynamically within each section, being zero at boundaries and optimized in between, allowing productivity maintenance with reduced harmful vibrations.
3Manufacturing precision
If the antenna movement is reduced to minimize image jitter, then image quality improves, but communication tracking capability deteriorates
Solution Approach 1:
The patent applies segmentation by dividing the antenna rotation into multiple processing sections. Each section is independently optimized with its own velocity profile, allowing the system to maintain ground station tracking capability while minimizing movement-induced image jitter. The segmentation enables localized optimization where the antenna can track effectively within each section while reducing overall vibration.
Solution Approach 2:
The patent applies preliminary action by pre-optimizing the velocity profile for each processing section before execution. The velocity is predetermined to be zero at section boundaries and optimized within sections, allowing the system to prepare for minimal vibration conditions while ensuring continuous ground station tracking capability is maintained throughout the rotation cycle.
Data Source
AI summary
A method of optimizing driving of an antenna for communication of an artificial satellite, by controlling a rotation angle of the antenna, according to an embodiment of the disclosure, includes: receiving a basic profile indicating a change in a rotation angle of the antenna such that a center line of the antenna points to a ground station in response to movement of the artificial satellite; determining a processing section with reference to points at which a rotation velocity of the antenna, for the basic profile, is zero; and generating an optimization profile that determines the change in the rotation angle of the antenna by configuring the rotation velocity of the antenna, for the processing section, with a preset optimized rotation velocity.