Communications

Download Digital Satellite Communications Systems and Technologies: by A. Nejat Ince (auth.), A. Nejat Ince (eds.) PDF

By A. Nejat Ince (auth.), A. Nejat Ince (eds.)

Among the distance actions of the final 3 a long time satellite tv for pc communications (SATCOM) has discovered the widest program in assembly either civil and army communications standards. a number of overseas, nearby and nationwide SATCOM structures of accelerating ability, potential and complexity were and are being carried out through the years. the newest models are using such thoughts as spot beams, processing transponders in SS-TDMA and operations in numerous frequency bands together with the EHF band. at the army facet, the USA of the US, the uk, France and NATO (the North Atlantic Treaty employer) were the one proprietors and operators of army SATCOM platforms within the West. The structures in being and less than improvement use satellites and floor terminals with features which vary from the civilian ones with appreciate to frequency bands utilised and survivability and interoperability. The SATCOM has given the army clients the potential for having much-needed mobility, flexibility and survivability in strategic and tactical communications for land, sea and air operations. It needs to, in spite of the fact that, be stated quite for the army SATCOM structures that they've been developed in colossal jumps, either in time and strength, every one leap concerning the deployment of 2 or 3 frequently especially designed huge satellites, huge expenditures and fairly hectic transition among jumps. regardless of those bad gains those structures didn't have the mandatory measure of suevivability and flexibility.

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Sample text

At SHF, CDMA modems will gradually be replaced by more ECM-resistant systems such as OM-55. Maritime links will normally be restricted to the 50 MHz- wide "exclusive band" between 7925 and 8025 MHz. Unlike previous NATO satellites, NATO IV will carry a UHF transponder and there is considerable interest in the use of this for naval applications. It is likely that DAMA will have to be introduced in order for all potential users to have access to the two narrowband channels available. UHF SATCOM is already extensively used by the US Navy and has the advantage of simplicity in the shipborne equipment.

C)Launch failures will have been experienced and maximum time made available for replacement satellite and new launch slot. 1 Services to be Provided by and Attributes of Future SATCOMS a) Communications for fixed,mobile and submerged platforms in all areas of interest to NATO including polar regions. b)Attributes including AT, survivability, covertness, .... information/ data e) Transportation(la unch vehicles) f) Materials (light weight structures) g) Support systems (power,TTC,) h) Software, artificial intelligence and expert systems,robotics i) Superconductivity j) Adaptive control systems.

Several categories of environment can be distinguished. 1. User Environment What is called here users environment is the status, at any given time, of the need for communications expressed by the users of the system. In the civilian systems, at least those for which statistics have been established for a long time, it is relatively easy to define the capacity required to satisfy the users. The daily and the seasonal variations of the traffic are well known and a good forecast can be made with regard to their evolution.

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