| || Submarine Communications
Author : Singh, H.B.;Pal, Rajendra
Source : Defence Science Journal ; Vol:43(1) ; 1993 ; pp 43-51
Subject : 623.61 Military Communications;623.8 Naval Science
Keywords : MSK modulator;ELF communication;ELF propagation;Acoustical communication;Optical communication
Abstract : Submarines operating in deep water are virtually cut off from the outer world. It becomes very important and essential to convey survivable and critical information to the submarine during the time it operates under water. Conventional means of radio communication do not serve any useful purpose as the higher frequencies get attenuated very sharply in sea water. At VLF band, which is presently being used by most of the world Navies, signal can penetrate only upto 8-10 m of depth. This depth is not sufficient under hostile environment. ELF is another band where listening depth is around 100 m but data rate is very low. This paper summarizes the various means of communication used to send messages to submarine while cruising at various depths. It seems that in the near future blue-green laser is going to be the vital means of sending large information to a submarine operating much deeper (500-700 m) with unrestricted speed.