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Antenna masts and antenna-equipped periscopes can be raised to obtain navigational signals but in areas of heavy surveillance, only for a few seconds or minutes; [1] current radar technology can detect even a slender periscope while submarine shadows may be plainly visible from the air.
The mechanical systems of submarine periscopes typically use hydraulics and need to be quite sturdy to withstand the drag through water. The periscope chassis may also support a radio or radar antenna. Submarines traditionally had two periscopes; a navigation or observation periscope and a targeting, or commander's, periscope.
For more than a century, periscopes have been sub commanders' window to the outside world, but the traditional periscope might soon be a relic.
Virtual periscope is a system that allows submerged submarines to observe the surface above them without having to come to a shallower depth, as is required by traditional periscopes. The system, described in a patent as "Virtual Periscope", [1] was tested in 2005 aboard USS Chicago (SSN-721). It employed a small camera mounted on the sail of ...
See, unlike periscopes in movies, wherein a single person has to peer through an eyepiece, the high-tech version of the instrument uses high-resolution cameras and displays images on big screens.
Sail of the French nuclear submarine Casabianca showing the diving planes, camouflaged masts, periscope, electronic warfare masts, door and windows.. In naval parlance, the sail (American usage) or fin (British/Commonwealth usage) (also known as a fairwater) of a submarine is the tower-like structure found on the dorsal (topside) surface of submarines.
The current photonics masts have a visual appearance so different from ordinary periscopes that when the submarine is detected, it can be distinctly identified as a Virginia-class vessel. As a result, current photonic masts will be replaced with Low-Profile Photonics Masts (LPPM) which resemble traditional submarine periscopes more closely. [52]
Submarine Action Information System SMA/Datamat MM/SBN-716 SACTIS; periscopes Barr & Stroud CK31 Search and CH81 Attack Periscopes; communication system by ELMER; III and IV Batches, after update 1999/2005: 1 x radar SMA MM/BPS 704-V2; 1 x sonar STN Atlas Elektronik – ISUS 90-20; Combat System STN Atlas Elektronik – ISUS 90-20; periscopes ...