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Multi-Constellation Software-Defined Receiver for Doppler Positioning with LEO Satellites.

Farzan Farhangian1, René Jr Landry1

  • 1LASSENA Laboratory, Department of Electrical Engineering, Ecole de Technologie Superieure, Montreal H3C-1K3, Canada.

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Summary

A new Multi-Constellation Software-Defined Receiver (MC-SDR) accurately tracks Low Earth Orbit (LEO) satellite Doppler shifts. This advancement improves positioning accuracy by 72% compared to single-constellation methods.

Keywords:
Doppler positioningGlobalstarIridiumLEO satelliteOrbcommnavigationsignals of opportunitysoftware-defined radio

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Area of Science:

  • Satellite navigation
  • Signal processing
  • Software-defined radio

Background:

  • Doppler positioning is a key localization method for Low Earth Orbit (LEO) satellites.
  • Accurate Doppler measurement requires a highly precise receiver design for Extended Kalman Filter (EKF)-based positioning.
  • Existing methods may lack the multi-constellation support needed for robust LEO satellite tracking.

Purpose of the Study:

  • To design and implement a Multi-Constellation Software-Defined Receiver (MC-SDR).
  • To extract and analyze Doppler measurements from various LEO satellite downlink signals.
  • To validate the receiver's accuracy for EKF-based positioning.

Main Methods:

  • Development of an MC-SDR capable of acquiring and tracking Doppler shifts.
  • Utilizing Two-Line Element (TLE) data for satellite position and orbital element determination.
  • Employing an EKF-based stationary positioning algorithm with an adaptive measurement matrix for validation.

Main Results:

  • Successful acquisition and tracking of Doppler shifts from Iridium-Next and Orbcomm satellites.
  • Demonstrated accuracy of approximately 132 meters for stationary receiver positioning.
  • Achieved a 72% accuracy improvement compared to single-constellation positioning methods.

Conclusions:

  • The developed MC-SDR effectively extracts Doppler measurements from LEO satellite signals.
  • The MC-SDR significantly enhances positioning accuracy through multi-constellation support.
  • This technology offers a more robust and precise solution for LEO satellite-based localization.