Underwater monitoring
AssigneeHer Majesty the Queen in right of Canada, as represented by the Minister of National Defence
InventorsMichael A. Hamid, Oscar A. Sandoz
Life of this patent
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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.
Claims9
Apparatus for detecting the presence of an underwater object, comprising:
- means for generating a first electrical signal of varying frequency;
- a monopole antenna;
- means for applying said first electrical signal of varying frequency to said monopole antenna for transmission of said signal by said monopole antenna as an electromagnetic signal propagated through a body of water to said object;
- said means for applying also receiving reflections of said electromagnetic signal sensed by said monopole antenna and providing a sound electrical signal corresponding to said reflections;
- means for comparing said first and second electrical signals to provide an output signal corresponding to variation in the input impedance of said monopole antenna;
- and
- means for indicating said output signal.
Apparatus for detecting the presence of an underwater object, comprising:
- three mutually spaced monopole antennas;
- each of said antennas being provided respectively with a signal generating, detecting and processing apparatus comprising:
- means for generating a first electrical signal of varying frequency;
- means for applying said first electrical signal of varying frequency to said monopole antenna for transmission of said signal by said monopole antenna as an electromagnetic signal propagated through a body of water to said object;
- said means for applying also receiving reflections of said electromagnetic signal sensed by said monopole antenna and providing a second electrical signal corresponding to said reflections;
- means for comparing said first and second electrical signals to provide an output signal corresponding to variation in the input impedance of said monopole antenna;
- and
- means for indicating said output signal.
Dependencies are inferred from the claim text.