Underwater monitoring

Details Underwater monitoring Underwater monitoring

1976-07-15

1978-02-07

Tubbesing, T. H.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 5PD, 343 15, G01S 902

Patent

active

040729419

ABSTRACT:
Apparatus for detecting the presence of an underwater object measures variations in the input impedance of a monopole antenna to provide data on the object. A sweep generator supplies a first electrical signal of varying frequency for transmission as an electromagnetic signal propagated through water from the antenna, and means are provided for detecting reflections of the electromagnetic signal to provide a second electrical signal, which is compared with the first electrical signal to provide an output signal. Preferably, the monopole antenna is one of three such antennas, which are provided with means for comparing input impedances of the antennas to provide an output signal representing the bearing of the object.

REFERENCES:
patent: 3237191 (1966-02-01), Bojko
patent: 3805263 (1974-04-01), Ueda
patent: 3903520 (1975-09-01), Shostak

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