Loading...

Autonomous Attitude and Position Determination of Satellites Using Earth Imagery

Samsami, Kiarash | 2016

490 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49075 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Ghanbarpour Asl, Habib
  7. Abstract:
  8. An autonomous method for attitude and position determination of a satellite without using data from ground stations and also without the need for human interference is proposed using the image that the satellite has taken at each moment. The proposed method is based on recognition of stable features in the image and using them in order to match the satellite image with a source image from the Earth and the latitude and longitude of the features become known.SIFT and SURF algorithms have been examined. Using the perspective equation and camera coordinate system, a model has been developed that relates the coordinates of a point in the image with its equivalent coordinates in the real world. Also using these relations a method for determining the position vector of the camera and transform matrix between the camera frame and inertial frame is proposed.In the simulation and results chapter, satellite images have been built for some different position and attitudes and after that, by comparing these images to a source image, the best features have been selected using the SURF algorithm and determination of the position and attitude vectors has been done based on that. The final results demonstrate that the more accurate the matched features are, the final results will have smaller error and also they show that the number and accuracy of the matched features are highly dependent on the simulated image used in the process
  9. Keywords:
  10. Image Processing ; Satellite Imagery ; Autonomous Attitude and Position Determination

 Digital Object List

 Bookmark

No TOC