Loading...

Position and Attitude Synchronization of Nano-Satellites Formation Flying Under J2 and Atmospheric Drag Perturbation

Khoddam Khorasani, Pooria | 2014

603 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46059 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Alasty, Aria; Salarieh, Hassan
  7. Abstract:
  8. Spacecrafts formation flying is defined as tracking or keeping of desired distance, relative position and attitude of two or more spacecrafts during a maneuver. Division of tasks between various smaller spacecraft’s and so reduction of need to advanced technologies, increase in reliability in system and doing special missions like 3-D imaging of planets and combining parameter measurements are some advantages of this method. For development of this method, in this thesisin addition of reviewing the common methods in spacecraft’s formation flying, we are supposed to provide a simple and new method called distributed control for controlling a formation of spacecrafts. Additionally by providing a proper control law according to this new method, showing the stability of controller, designing and simulating of some maneuvers by use of various formations and methods, the functionality of various methods will be validated. The dynamic model used in this thesis is a coupled 6DOF model of spacecraft’s position and attitude. The J-2 effect and drag of atmosphere are considered as perturbations of position equations and gravity gradient torques and trust misalignments are considered as perturbation of attitude equations. For controlling of spacecraft’s, robust control relative to perturbations and parameters uncertainty such as mass or moment of inertia of spacecraft’s is considered. Finally by simulating of considered missions, in addition to reviewing and comparing various control methods, effective functionality of controller‘s robust term will be shown. Furthermore by using a common trust model of SPHERES spacecraft, the ON/OFF time periods of trusts during a considered maneuver will be provided
  9. Keywords:
  10. Decentralized Control ; Robust Control ; Coupled Control ; Spacecraft Dynamic Model ; Distributed Structure

 Digital Object List

 Bookmark

No TOC