Patent, Filed 22 Mar 71, patented 13 Nov 90,
DEPARTMENT OF THE NAVY WASHINGTON DC
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Disclosed is a system for locating a wire that is partially submerged within water and partially extends out thereof which includes a transmitter for broadcasting radio frequency electromagnetic signals, a phase gradiometer for receiving said radio frequency electromagnetic signals after they have been received by that portion of said wire that extends out of said water and re-radiated by that portion of said wire that is submerged therein and for timely producing a pair of out-put signals in response thereto, a pair of constant output amplifiers for processing said pair of gradiometer out-put signals to identical useful levels, a phase comparator for determining the phase relationship between said pair of processed output signals, and a readout for indicating said phase relationship. The aforesaid phase gradiometer may be housed in a probe-type of mobile underwater vehicle which is towed by a tractor vehicle in such manner as to cause said phase gradiometer to traverse an underwater course in search of said wire.
- Active and Passive Radar Detection and Equipment