Ordnance – Waging war
Patent
1991-02-21
1992-03-31
Brown, David H.
Ordnance
Waging war
114 212, 367133, F42B 1946, G01S 968
Patent
active
050997467
DESCRIPTION:
BRIEF SUMMARY
The invention relates to method and device for locating and destructing submarine vehicles from airborne vehicles disposed above the water surface, the airborne vehicle being connected to the device comprising sensing means sensing generally in the horizontal plane to discover submarine vehicles in the water, and being lowered down into the water from the airborne vehicle, the sensing means sensing the surrounding water to register presence and direction of submarine vehicles in the water.
Location and destruction of submarine vehicles take place from the air, the water and the water surface. From the air the hunting of submarine vehicles is normally done by means of helicopter which, after discovering and locating the target, launch one or several depth charges to the target. It is also possible to utilize airplanes to hunt the submarine vehicles. The major advantage with airbased weapon systems is their ability to cover large areas and their ability to move fast to the present search area. In the water other submarine vehicles are an efficient weapon especially for reconnaissance, if the distance between the submarine vehicles is small to start with. The perhaps most efficient fighting of submarine vehicles is that from the water surface because a high capability in watching can be combined with carrying large amounts of arms. The time of transport between the vehicle camp and the fighting area as with submarine vehicles is the main disadvantage.
Normally hydrophone elements are utilized to detect submarine vehicles, said elements being active or passive. An active hydrophone element emits sound pulses in the water and receives the sound pulses reflected on various objects in the water. A passive hydrophone element only listens for sounds generated by a submarine vehicle.
As for water vehicles the hydrophone element is normally arranged in the hull of the vehicle, which as to helicopters the hydrophone element is lowered from the helicopter hovering above the water surface. When airplanes are being utilized in detecting submarine vehicles normally other types of detection means such as heat sensitive cameras, radar and the like are utilized. When the submarine vehicle has been located it is first of all decided if the use of weapons is appropriate with reference among other things to hit probability and risks. Preferably the decision is made by personnel on the arms carrying vehicle. When the fighting is done by helicopters the use of weapons normally takes place from other helicopters than the watching helicopter or helicopters.
The most common type of weapon in fighting submarine vehicles is depth charges which are detonated at adjustable levels or at direct or magnetic contact with the submarine vehicle. The most simple type of depth charges completely lacks a propulsion means of its own and falls towards the bottom of the sea when launched from airborne vehicles or surface vehicles. More developed types of depth charges comprise also a hydrophone element and some type of steering means e.g. a rudder which during the course of fall steers the depth charge towards the target in dependence of the sound impulses received in said hydrophone element. Further developed depth charges are also provided with propulsion means of its own.
The latter type of weapon can be compared to a type of torpedo. Also torpedoes exist as more or less advanced and complicated types. However, they all comprise some kind of sensor means so as to find out the direction of the submarine vehicle, a propulsion mechanism on their own and of course a warhead. Torpedoes can be launched from all the arms carrying systems described above.
Homing torpedoes launched from airborne or surface vehicles must as soon as possible after penetration of the water surface search surrounding water by means of the sensor means, detect the direction of the target, i.e. the submarine vehicle, and thereafter during the movement ahead steer towards the target. It is imperative that the direction is determined as soon as possible because the torpedo is of
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patent: 4473896 (1984-09-01), Loeser et al.
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Gustavsson Mats
Olsson Jan
Olsson Thord
Brown David H.
SA Marine AB
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