Communications: electrical – Selective – Path selection
Patent
1969-11-24
1977-04-12
Farley, Richard A.
Communications: electrical
Selective
Path selection
340 6R, G01S 380
Patent
active
040178226
ABSTRACT:
Apparatus for determining the bearing of a remotely located source of an inging acoustic signal including a sonobuoy having a submerged package including a hydrophone array for producing omnidirectional and orthogonal directional signals, a combiner for combining the directional signals, and a single channel multiplexer including modulators and a compass driven resolver for providing a single channel multiplexer output signal carrying bearing information in a single frequency channel via a cable to a transmitter unit carried by a surface package of the sonobuoy. The transmitter unit transmits the single channel multiplexed information to a receiver whose output signal is applied to a demultiplexer for deriving a pair of phase shifted signals indicative of the omnidirectional acoustic signal received which pair have a relative phase shift equivalent to the bearing angle referenced to magnetic North. The pair of signals from the demultiplexer are fed to a processor which produces an output signal indicative of the bearing angle for driving a display.
REFERENCES:
patent: 3176262 (1965-03-01), Ehrlich et al.
patent: 3444508 (1969-05-01), Granfors et al.
Brower Edgar J.
Buchan, Jr. B. F.
Farley Richard A.
Hansen Henry
The United States of America as represented by the Secretary of
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