Multi-user leo-satellite receiver for robust space detection of AIS messages

The coverage of the terrestrial automatic identification system (AIS) is limited to close areas off the coast. Low earth orbit (LEO) satellites can expand the service of AIS to a global range but it brings large variance in Doppler shift, path loss and propagation delay. The communication between ships and LEO satellites becomes asynchronous. The collision of AIS messages from thousands of ground cells results in loss of all collided messages. Previous papers discussed the use of a single user receiver to detect AIS messages under heavy co-channel interference but the problem was never well solved. In this paper, we present a multi-user receiver equipped with an antenna array on LEO satellites, which explores the spatial multiplexing in space detection of AIS messages and significantly improves the detection performance. The proposed receiver performs rank tracking and subspace intersection based on the signed URV decomposition ahead of blind source separation to provide robust separation of user data for single user receivers. The proposed receiver is tested in an exact dynamic AIS model.

[1]  Mu Zhou,et al.  Stable Subspace Tracking Algorithm Based on a Signed URV Decomposition , 2012, IEEE Transactions on Signal Processing.

[2]  M.K. Simon,et al.  Differential detection of Gaussian MSK in a mobile radio environment , 1984, IEEE Transactions on Vehicular Technology.

[3]  Robert H. Halstead,et al.  Matrix Computations , 2011, Encyclopedia of Parallel Computing.

[4]  Alberto Ginesi,et al.  Satellite‐based vessel Automatic Identification System: A feasibility and performance analysis , 2011, Int. J. Satell. Commun. Netw..

[5]  Douglas J. Nelson,et al.  GMSK co-channel demodulation , 2009, Optical Engineering + Applications.

[6]  Mu Zhou,et al.  Improved subspace intersection based on signed URV decomposition , 2011, 2011 Conference Record of the Forty Fifth Asilomar Conference on Signals, Systems and Computers (ASILOMAR).

[7]  Alle-Jan van der Veen,et al.  A Schur Method for Low-Rank Matrix Approximation , 1996, SIAM J. Matrix Anal. Appl..

[8]  Gene H. Golub,et al.  Matrix computations (3rd ed.) , 1996 .

[9]  Ulrich Sorger,et al.  Coherent receiver for AIS satellite detection , 2010, 2010 4th International Symposium on Communications, Control and Signal Processing (ISCCSP).

[10]  Alle-Jan van der Veen,et al.  Schur method for low-rank matrix approximation , 1994 .

[11]  J. Aarons,et al.  Global morphology of ionospheric scintillations , 1971, Proceedings of the IEEE.

[12]  James E. Hicks,et al.  AIS/GMSK receiver on FPGA platform for satellite application , 2005, SPIE Defense + Commercial Sensing.

[13]  Mu Zhou,et al.  Systemc-AMS model of a dynamic large-scale satellite-based AIS-like network , 2011, FDL 2011 Proceedings.

[14]  Gudrun Høye,et al.  Maritime traffic monitoring using a space-based AIS receiver , 2006 .

[15]  Arogyaswami Paulraj,et al.  An analytical constant modulus algorithm , 1996, IEEE Trans. Signal Process..