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The personnel sphere's walls are 5 cm thick, and the inside diameter of the working area is 2.1 m. Three viewports are provided (viewport material is 18 cm thick): the forward-facing port is 20 cm diameter; the two side-facing ports are 12 cm diameter each. Power is provided by NiCad batteries of 100 kWh capacity.
Forward- and side-looking sonar The Advanced SEAL Delivery System ( ASDS ) was a midget submarine operated by the United States Navy and United States Special Operations Command . It provided stealthy submerged transportation for United States Navy SEALs from the decks of nuclear submarines for use as an insertion platform for covert and ...
A submarine in this "blind spot" became effectively invisible to the sonar, allowing it to make evasive manoeuvres undetected. The solution was a weapon mounted on the foredeck that discharged the projectiles up and over the ship's bow while the submarine was still detectable by the sonar, entering the water some distance in front of the ship.
The first commercial side-scan system was the Kelvin Hughes "Transit Sonar", a converted echo-sounder with a single-channel, pole-mounted, fan-beam transducer introduced around 1960. In 1963 Dr. Harold Edgerton, Edward Curley, and John Yules used a conical-beam 12 kHz side-scan sonar to find the sunken Vineyard Lightship in Buzzards Bay ...
The source is a vertical line array (VLA) of up to 18 source projectors suspended below the vessel. LFA’s transmitted sonar beam is omnidirectional (i.e., a full 360 degrees) in the horizontal (nominal depth of the LFA array center is 120 m [400 ft]), with a narrow vertical beamwidth that can be steered above or below the horizontal.
A dual-face rotating phased array radar is mounted on the top of the forward integrated mast. [2] [8] The stern has ports for deploying towed sonars and decoys. [2] Armament includes a 100mm main gun, resembling the H/PJ-87, a 32-cell vertical launching system (VLS), a Type 1130 11-barrel 30mm close in weapon system, and HQ-10 air defense ...