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Improved maritime communications

Demodulating a marine automatic identification signal (AIS) when carrier frequency, carrier phase, and time alignment offset are unknown.


These technologies enhance the signals and systems used for maritime communications. The first uses a demodulator to improve the Automatic Identification System (AIS) used for ship tracking, collision avoidance, and search and rescue. The demodulator can function on a signal that transmits data at a known baud rate but has an unknown carrier frequency, unknown carrier phase, and unknown preamble, reducing the risk of at-sea collisions. The second technology improves demodulating AIS signals without requiring user-specific training codes or an equalizer, which enhances favorable signal qualities and decorrelates interfering signals.

Potential applications include: ship or drone tracking and collision avoidance, water-based search and rescue, and port security.

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