Communications – electrical: acoustic wave systems and devices – Echo systems – Distance or direction finding
Patent
1969-10-10
1987-03-24
Farley, Richard A.
Communications, electrical: acoustic wave systems and devices
Echo systems
Distance or direction finding
G01S 762, G01S 1506
Patent
active
046530320
ABSTRACT:
The system is for determining the direction and/or distance of objects and, especially of watercrafts, by means of water-borne sound waves transmitted from the ship to a torpedo, for example. The system includes a cathode ray tube located on the ship for displaying sectors of interest, at least one storage means at the torpedo for storage and delivery of sound location data and being connected to a length of wire for transmitting stored location data over the wire to the ship, a controllable threshold discriminator connected to the storage means, and means for limiting the frequency bandwidth of data signals transmitted over the communication wire to an order of magnitude of 500 Hz.
REFERENCES:
patent: 3148651 (1964-09-01), Ray
patent: 3419845 (1968-12-01), Thiede et al.
Schwarz Hans D.
Thomsen Werner
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