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The Automatic Identification System (AIS) is a maritime safety and vessel traffic system imposed by the International Maritime Organization (IMO). The system broadcasts position reports and short messages with information about the ship and the voyage. For the separation, demodulation and decoding of the mixed signals acquired by the space-based AIS, the problems of signal detection an d parameter...
A synchronous demodulation algorithm based on energy operator for satellite-based AIS signals is proposed. Firstly, the baseband signal is obtained by differencing the intermediate frequency signal and estimating the envelope with energy operator. Bit synchronization and decision are achieved by applying the maximum measurement method which selects the best set of samples with the maximum energy....
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