Abstract
The Automatic Identification System (AIS) is a tracking system used on ships for several decades to improve traffic monitoring and safety at sea in a short range. The modulation technique used is Gaussian Minimum Shift Keying (GMSK).
Recently, the idea of receiving AIS signals from space arose. This presents mainly two challenges. The first one is that received signals present a large Doppler range due to the satellite speed. The second one is the simultaneous reception of signals from ships because of the broad satellite coverage.
In this paper, a novel non-coherent GMSK demodulator is proposed to handle the large Doppler shift problem based on several FM discriminators in parallel. A frame collision detection algorithm is presented but the collision problem is not addressed.
In addition, computer simulated and real signals are used to study the receiver performance on an AWGN channel.
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References
ITU: Recommendation ITU-R M.1371-2, Technical characteristics for a universal shipborne automatic identification system using time division multiple access in the VHF maritime mobile band, last version (2006)
Morelli, M., Mengali, U.: Joint Frequency And Timing Recovery For MSK-Type Modulation. IEEE Transactions on Communications (June 1999)
Narheim, B.T.: NCUBE-1 and 2 AIS Detection Probability, Norwegian Defence Research Establishment (2007)
Høye, G.K., Eriksen, T., Meland, B.J., Narheim, B.T.: Space-based AIS for Global Maritime Traffic Monitoring. Norwegian Defence Research Establishment (2007)
Bianchi, P., Loubaton, P., Sirven, F.: Blind Joint Estimation of the Technical Parameters of Continuous Phase Modulated Signals, France (2003)
Hull University: Appendix D: Digital Modulation and GMSK, http://www.emc.york.ac.uk/reports/linkpcp/appD.pdf
Haykin, S.: Communication Systems, 4th edn., pp. 396–400. John Wiley & Sons, New York (2001)
Mehrotra, A.: GSM System Engineering, The Artech House Mobile Communication Series, pp. 216–217 (1996) ISBN: 0-89006-860-7
Schiphorst, R., Hoeksema, F., Slump, K.: Bluetooth demodulation algorithms and their performance, Netherlands
Turletti, T.: GMSK in a nutshell. Massachusetts Institute of technology (1996)
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© 2010 ICST Institute for Computer Science, Social Informatics and Telecommunications Engineering
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Gallardo, M.A.J., Ruy, G. (2010). FM Discriminator for AIS Satellite Detection. In: Sithamparanathan, K., Marchese, M., Ruggieri, M., Bisio, I. (eds) Personal Satellite Services. PSATS 2010. Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, vol 43. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-13618-4_2
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DOI: https://doi.org/10.1007/978-3-642-13618-4_2
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