Communications: electrical – Selective – Having indication or alarm
Patent
1977-07-22
1978-08-29
Farley, Richard A.
Communications: electrical
Selective
Having indication or alarm
340 3E, G01S 518
Patent
active
041107268
ABSTRACT:
A system for determining the position of a ship in relation to predetermined positions on the ocean floor is disclosed. A plurality of first acoustic addressable transponders and a plurality of second acoustic addressable transponders are respectively located at first and second sets of predetermined positions on the ocean floor. Each of the acoustic transponders transmits an acoustic ranging response and identification signal in response to receipt of an acoustic ranging interrogation signal. First and second buoy communications systems are located on first and second buoys respectively moored to the ocean floor in the vicinity of the first and second pluralities of acoustic transponders. Each buoy communication system includes an acoustic communications devices for transmitting an acoustic ranging interrogation signal to the respective acoustic transponders in its vicinity and for receiving acoustic ranging response and identification signals from such acoustic transponders in response thereto; a buoy RF communications device for transmitting RF signals containing information representative of the respective propagation delays between transmission of the acoustic ranging interrogation signal and receipt of the acoustic ranging response and identification signals from the acoustic transponders; and a buoy RF addressable transponder for transmitting an RF buoy ranging response and identification signal in response to receipt of an RF ranging interrogation signal. A ship communications system located on the ship transmits the RF ranging interrogation signals and receives the RF buoy ranging response and identification signals in response thereto. The ship communications system also transmits command signals. The first and second buoy communications systems each respond to the command signal by transmitting the acoustic interrogation signals to the acoustic transponders. The ship communications system receives the RF signals containing the acoustic propagation delay information. A data processing system processes the received RF signals in relation to the transmitted RF ranging interrogation signals to determine the position of the ship in relation to the first and second sets of predetermined positions on the ocean floor.
REFERENCES:
patent: 2910665 (1959-10-01), Hawkins
patent: 3860900 (1975-01-01), Scudder
patent: 3864662 (1975-02-01), David et al.
Dorrance William T.
Wilson William R.
Farley Richard A.
General Dynamics Corporation Electronics Division
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