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

  • Zhou M
  • Van Der Veen A
  • Van Leuken R
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Abstract

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.

Author-supplied keywords

  • LEO satellite
  • Multi-user receiver
  • automatic identification system
  • signed URV decomposition
  • subspace intersection

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Authors

  • Mu Zhou

  • Alle Jan Van Der Veen

  • Ren?? Van Leuken

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