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Submarines Discussion Board
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Subject: Communication for subs
Doz44    10/17/2004 2:16:25 PM
A rookie question i guess but how do nuc subs communicate with their respective govt's? How about with each other?
 
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french stratege    RE:Communication for subs   10/17/2004 7:05:43 PM
Normally in a passive way using ELF (extremely low frequency waves which penetrate water for few meters allowing a submerged towed antenna to receive data) especially for SLBM. Other means are satellites, HF, transmission buoy and blue-green lasers in a near future.Plus acoustic waves if a surface ship is nearby.
 
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elcid    RE:Communication for subs   10/17/2004 7:14:54 PM
French Strategy (rewritten in English) is a bit too cryptic but correct. The problem is he does not make it clear what the limits are. Communication with submarines is hard. Communication FROM submarines is harder. The problem is radio waves don't like the sea very much. If a submarine is surfaced, or surfaces an antenna, it can use satellite communications, or classical HF, VHF or UHF communications, two way. The problem with this it is dangerous to do that - getting near the surface or actually surfacing is to risk detection in many situations. Also, sub antennas are not as efficient as big ship antennas are, due to space limitations, satellite antennas being somewhat an exception to this problem. If a submarine is not on the surface and wants to listen only, it can trail a long wire, and get ELF or ULF signals underwater. Not an unlimited way underwater, however. These messages are very short - low frequency reduces the signal speed dramatically. This often means the signals say "surface an antenna to get my real transmission." At close range a sub can use a sonar telephone to talk to another sub or ship, but everyone in the area hears EVERYTHING. Subs often are out of communication for long periods. Subs also can send bouys up to send emergency signals such as "location of sunk submarine."
 
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Wiz       2/17/2007 3:59:38 PM
Blue green laser has great potentials, including anti-mine sensing, but the disadvantage of blue green laser is that it has only a punch of few (around ten) meters below surface. However, it is still worth something for a sub to communicate with a satellite from 10 meters below rather than going back onto the surface.
 
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gf0012-aust       2/17/2007 10:40:13 PM

 However, it is still worth something for a sub to communicate with a satellite from 10 meters below rather than going back onto the surface.


10 metres is as good as dead.
 
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gf0012-aust       2/17/2007 11:12:51 PM

 However, it is still worth something for a sub to communicate with a satellite from 10 meters below rather than going back onto the surface.


10 metres is as good as dead.
 
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stingray1003       2/21/2007 12:45:18 AM
I would have thought Fiber optics would have been key. Isn't this what Cbass uses?
 
Fiber could communicate with towed arrays. Fiber links could be made between submarines.
 
 Using sound, could not the transmission be packaged in such a way to sound like a whale or dolphin? So that unless you knew exactly to listen for you couldn't intercept nor tell them apart?
 
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