Graduate Thesis Or Dissertation

 

Visual Spacecraft Relative Motion Control using Higher Order Geometric Moments Público Deposited

Conteúdo disponível para baixar

Baixar PDF
https://scholar.colorado.edu/concern/graduate_thesis_or_dissertations/37720d12v
Abstract
  • This thesis studies passive visual relative control for satellites. The three main problems studied are how to keep the camera pointing at the center of the target, how to move the satellite so the camera can look at the target from a perpendicular orientation or maintain a fixed orientation, and how to maintain a nominal distance from the target. Visual target tracking within the image uses a statistical pressure snake algorithm, which tracks the outer contour of a target and allows geometric moments to be calculated. The attitude control is based off of tracking the center of the visual target, which is the first moment. The attitude control can treat the inertial target angular velocities as disturbances in the control for slow, smooth reference motions and still be stable. The skewness coefficient g3, which is a non-dimensional form of the third moment, can be used as a measure of perpendicularity when certain information is known about the target. A 640x480 pixel resolution camera is used to obtain better skewness and perpendicularity information than the human eye. A distance control does not need to assume the absolute distance, but can maintain a nominal distance by using the image inertia, or second moment information.
Creator
Date Issued
  • 2011
Academic Affiliation
Advisor
Committee Member
Degree Grantor
Commencement Year
Subject
Última modificação
  • 2019-11-18
Resource Type
Declaração de direitos
Language

Relações

Itens