Joint Doppler and Azimuth DOA Tracking for Positioning with Iridium LEO Satellites

Shaghayegh Shahcheraghi, Forough Nasihati Gourabi, Mohammad Neinavaie, Zaher M. Kassas

Peer Reviewed

Abstract: A receiver capable of estimating the Doppler and azimuth direction-of-arrival (DOA) of Iridium NEXT low Earth orbit (LEO) signals of opportunity (SOPs) is presented. The proposed receiver operates in three stages: (i) Fast Fourier Transform (FFT)- based Doppler acquisition, (ii) Kalman filter (KF)-based Doppler tracking, and (iii) Doppler-compensated MUltiple SIgnal Classification (MUSIC)-based algorithm for DOA tracking. Experimental results are presented demonstrating successful tracking of the Doppler frequency and azimuth DOA of an Iridium NEXT LEO satellite, achieving a Doppler root mean square error (RMSE) of 8.1 Hz over 120 seconds and an azimuth DOA RMSE of 1.04 degrees over 60 seconds. The Doppler and azimuth DOA measurements are fused via an extended Kalman filter (EKF) to localize a stationary receiver. Starting with an initial estimate 7 km away from the true receiver’s position, the Doppler-only measurements yielded a final positioning error of 656.m, while the Doppler and azimuth DOA measurements reduced the error to 289.5 m.
Published in: Proceedings of the 36th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2023)
September 11 - 15, 2023
Hyatt Regency Denver
Denver, Colorado
Pages: 2373 - 2383
Cite this article: Shahcheraghi, Shaghayegh, Gourabi, Forough Nasihati, Neinavaie, Mohammad, Kassas, Zaher M., "Joint Doppler and Azimuth DOA Tracking for Positioning with Iridium LEO Satellites," Proceedings of the 36th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2023), Denver, Colorado, September 2023, pp. 2373-2383. https://doi.org/10.33012/2023.19450
Full Paper: ION Members/Non-Members: 1 Download Credit
Sign In