navigation and remote sensing is the evolutinary direction for future low earth orbit (LEO) satellite Internet to achieve ubiquitous integrated space-based information service. To expand the utilities of existing communication constellations
a multi-satellite joint positioning scheme has been designed
which utilizes the Doppler shift carried by communication signals to obtain the geographical location information for target terminals. Furthermore
a practical Doppler shift estimation algorithm has been proposed
which can address the issue of LEO satellite Doppler shift exceeding the subcarrier spacing of OFDM system. Finally
through link-level simulation
the positioning performance of the proposed scheme for target terminal has been validated.
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references
ALI I , AL-DHAHIR N , HERSHEY J E . Doppler characterization for LEO satellites [J ] . IEEE Transactions on Communications , 1998 , 46 ( 3 ): 309 - 313 .
NGUYEN N H , DOĞANÇAY K . Algebraic solution for stationary emitter geolocation by a LEO satellite using Doppler frequency measurements [C ] // Proceedings of the 2016 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) . Piscataway : IEEE Press , 2016 : 3341 - 3345 .
MOHAMAD HASHIM I S , AL-HOURANI A , RISTIC B . Satellite localization of IoT devices using signal strength and Doppler measurements [J ] . IEEE Wireless Communications Letters , 2022 , 11 ( 9 ): 1910 - 1914 .
YUAN Y P , YI J X , WAN X R , et al . Doppler location method and experiment based on satellite chain beacon signal [J ] . Systems Engineering and Electronics , 2024 , 46 ( 8 ): 2535 - 2545 .
LI S J , ZHANG Q Y , DENG B Y , et al . A fast and accurate LEO satellite-based direct position determination assisted by TDOA measurements [J ] . China Communications , 2022 , 19 ( 1 ): 92 - 103 .
NOURELDIN A , KARAMAT T B , GEORGY J . Fundamentals of inertial navigation, satellite-based positioning and their integration [M ] . Cham : Springer Berlin Heidelberg , 2013 .
VAN DE BEEK J J , SANDELL M , BORJESSON P O . ML estimation of time and frequency offset in OFDM systems [J ] . IEEE Transactions on Signal Processing , 1997 , 45 ( 7 ): 1800 - 1805 .
YAO Y W , GIANNAKIS G B . Blind carrier frequency offset estimation in SISO, MIMO, and multiuser OFDM systems [J ] . IEEE Transactions on Communications , 2005 , 53 ( 1 ): 173 - 183 .
ROY R , PAULRAJ A , KAILATH T . ESPRIT: a subspace rotation approach to estimation of parameters of cisoids in noise [J ] . IEEE Transactions on Acoustics, Speech, and Signal Processing , 1986 , 34 ( 5 ): 1340 - 1342 .
TURELI U , LIU H , ZOLTOWSKI M D . OFDM blind carrier offset estimation: ESPRIT [J ] . IEEE Transactions on Communications , 2000 , 48 ( 9 ): 1459 - 1461 .