Doppler sonar marine navigation system - monitors ultrasonic reflections from sea bed and uses current flow parameters

摘要

The navigation aid (5) is built into the bottom of a ship. It measures the speed across the ocean bottom and uses current flow parameters to track vessel location. A Doppler shift detecting sonar device supplies signals to a processor unit on board, which indicate longitudinal and transverse traverse speed data. Current flow monitor systems provide similar data relating to the passage of water relative to the boat. These parameters collectively define vessel track from reference point which is monitored by the processor.