Navigation-monitoring apparatus

Details Navigation-monitoring apparatus Navigation-monitoring apparatus

G - Physics

01

S

343/16, 343/18

G01S 13/74 (2006.01) G01S 5/14 (2006.01) G01S 13/76 (2006.01)

Patent

CA 1117632

- 15 - Abstract of the Disclosure A navigation-monitoring apparatus comprises a fixed ground station sending forth an interrogation signal to a ship and a transponder carried on the ship and trans- mitting a reply signal to the fixed ground station in response to the interrogation signal. A microwave sensor carried on the ship measures a distance between the ship and the nearest bank. Data on the measured distance is added to a reply signal sent forth from the ship to the fixed ground station. The fixed ground station measures an interval between a point of time at which the interrogation signal was issued and a point of time at which a reply signal from the ship was received, thereby defining the position of the ship from said time interval and data on the ship-to-bank distance.

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