Author_Institution :
Hydro Products, Inc., San Diego, CA, USA
Abstract :
Ever since man has explored hydrospace, he has been plagued with the problem of communications with other men,both within the hydrosphere and external to it. The advent of deep diving suhmersibles and high speed submarines has further complicated the communications problem with depth and speed para- meters. Present-day communication trends and techniques are utilizing VHF and UHF for communications between ships and aircraft, with long range links being done with geosychronous satellites. In addition, maritime navigational satellites operate in the VHF and UHF spectrum. Unfortunately, VHF and UHF radio waves are highly attenuated by seawater and penetrate only to depths of inches. The problem, then, is to develop radio communications between deeply submerged systems,moving or stationary, and other ships, aircraft, or satellites. This paper will describe some of the techniques used to achieve the desired results.
Keywords :
UHF radio propagation; VHF radio propagation; marine communication; military aircraft; ships; underwater vehicles; UHF radio waves; VHF radio waves; aircraft; geosychronous satellites; hydrosphere; maritime navigational satellites; radio communication; ships; submersible systems; Coaxial cables; Coaxial components; Communication system control; Control systems; Filters; Frequency synthesizers; Integrated circuit interconnections; Process control; Telephone sets; Underwater vehicles;
