Navigation-monitoring apparatus

Details Navigation-monitoring apparatus Navigation-monitoring apparatus

1979-01-18

1981-07-14

Tubbesing, T. H.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 5BD, G01S 1387

Patent

active

042789753

ABSTRACT:
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 transmitting a reply signal to the fixed ground station in response to the interrogation signal. A microwave sensor carried on the ship measures the 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.

REFERENCES:
patent: 3136991 (1964-06-01), De Faymoreau et al.
patent: 3772693 (1973-11-01), Allard et al.
patent: 4063240 (1977-12-01), Isbister et al.

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