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Orbit Determination of Satellite in LEO Using Satellite Transmitted Signals

Roghanizad, Ebrahim | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40832 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Pourtakdoust, Hossein
  7. Abstract:
  8. One of the most important pillars of independence in the space programs of any country is to have the capability of tracking and orbit determination of its own satellites. Hence, in this project, based on the practical approach, a radio-tracking system has been designed domestically for Iran. In this one-way radio-tracking system, the pseudo-noise code, which in fact has the role of spreading frequency spectrum in the satellite digital communications, is employed as the periodic ranging signal. Furthermore, the Doppler effect on the carrier-wave frequency provides the range rate of the satellite. Thus, it has been shown that from the satellite waves, which are emitted omnidirectionally for the purpose of data transmission, tracking and orbit determination of the satellite can also be performed easily without need for any additional information. Subsequently, the four airports of Kerman, Chabahar, Mashhad and Khark have been proposed as a set of tracking ground stations, which form an appropriate star configuration. Accordingly and on the basis of the observations data gained in this system, the required calculations for satellite tracking and orbit determination have also been explained. It should be noted that in this scheme, in the observations part, the dual-carrier-frequency technique has been utilized in order to be able to eliminate the ionospheric-produced errors from the measured data. Moreover, in the calculations part, by correcting the effect of the troposphere layer and finding the exact frequency of the transmitted carrier wave, the accuracy of the obtained results improves more
  9. Keywords:
  10. Doppler Effect ; Radio Tracking System ; Satellite Orbit Determination ; Ranging

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