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Passive Positioning with Low Earth Orbit Satellites

Pakzad, Ali | 2025

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 58414 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Behroozi, Hamid; Amiri, Rouhollah
  7. Abstract:
  8. The Global Navigation Satellite System (GNSS) is widely utilized for positioning and navigation purposes; however, its continuous accessibility is not guaranteed. Challenges such as signal disruption at the source, interference, or the transmission of erroneous signals targeting the communication between receivers and the system have consistently posed significant obstacles to its reliable use. This research aims to develop a passive and opportunistic positioning method leveraging Low Earth Orbit (LEO) satellites, with a particular focus on the Starlink constellation. This approach effectively addresses the aforementioned challenges to a significant extent while offering a highly cost-effective positioning solution. The proposed positioning method relies on the unique characteristics of signals transmitted by LEO satellites, utilizing Doppler frequency measurements from received signals and the theory of time dilation. In this study, an opportunistic positioning system based on Starlink satellites has been fully simulated and implemented as a positioning algorithm. The passive positioning is achieved through Doppler frequency measurements and the solution of an unconstrained optimization problem at specified time intervals
  9. Keywords:
  10. Positioning ; Low Earth Orbit (LEO)Satellite ; Starlink ; Doppler Effect ; Opportunistic Satellite Communications

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