ELF Radiation from a Number of Dispersed Antenna Locations for Submarine Communications.

摘要

It is technically feasible to radiate an adequately strong ELF signal for submarine communications by utilizing a number of independent antenna sites (e.g. either 50 separate sites or 5 arrays of 10 antennas each). Each antenna must be properly phased so as to constructively add the amplitudes of the individual signals. The dispersed system makes up for the degradations caused by higher ground conductivity by use of a high power (5 megawatt) generator for each antenna. For a system composed of 50 antennas each 20 km long, the total power consumed -- 250 megawatts -- is much larger than the present Sanguine/Seafarer system but the real estate demands are much less. The higher power per individual antenna may entail using a number of parallel cables or more deeply burying some cables to avoid environmentally unacceptable high surface magnetic fields. Lastly it is proposed that a VLF communications system link the various antenna sites. (Author)