Radio frequency phase sensitive wire detector

Details Radio frequency phase sensitive wire detector Radio frequency phase sensitive wire detector

1973-04-20

1993-09-28

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Underwater system

324 67, H04B 1100

Patent

active

052491625

ABSTRACT:
An underwater object detection system and method are described which util changing phase relationships between radio waves received by a moving underwater receiver, via a retransmitting underwater object, and radio waves received through air directly from a transmitter. The moving underwater receiver is characterized by an envelope or encapsulation of material of different radio wave propagation rate than that of the water medium, so that a markedly different phase change relation exists when the underwater receiver is in contact with the object.

REFERENCES:
patent: 3526831 (1970-09-01), Smith
patent: 3617865 (1971-11-01), Hakata

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