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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.

Communications

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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