By DAPS Saufley Field
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The installation of subsystem baseband equipment and rf terminals aboard ships is driven by communications traffic levels, type of communications, and mission requirements. For example, Fleet Broadcast, a common subsystem in naval communications, is received by many different types of ships. Atypical suite on a large ship may include Fleet Broadcast, CUDIXS, NAVMACS, Secure Voice, TADIXS, OTCIXS, Teletypewriter, and TACINTEL equipment. Common User Digital Information Exchange Subsystem (CUDIXS) and Navy Modular Automated Communications Subsystem (NAVMACS).
Fleet Broadcast Ship-to-Shore As the name implies, this service involves broadcast area coverage from shorebased transmitters to ships at sea. To overcome propagation problems, messages are sent on several frequencies at the same time (frequency-diversity). Space-diversity with physically separated receive antennas also helps overcome propagation problems. High-frequency atmospheric communications between shore stations are relatively easy because shore stations have sufficient space for efficient omnidirectional antennas or arrays that provide hf coverage of large areas.
Because these satellites are in such high orbits, any attempt to disable or destroy them from the Earth would be difficult and expensive. However, Earth terminals are a different story. They offer a more attractive target for destruction by conventional methods. But these terminals can be protected by the same methods taken to protect other vital installations. So overall, the satellite system is nearly free from harm by an enemy. ADVANTAGES OF SATELLITE COMMUNICATIONS Operationally, highly directional earth terminal antennas provide a high degree of freedom from jamming.