Thursday, April 8, 2010

modern spatial techniques

Satellite communication is an essential branch of modern spatial techniques. It can realize the radio communication between the mobile terminals by using the satellite repeater which acts as relay. Among the satellite mobile communication systems, the cheap nike shoes(Low Earth Orbit Mobile Satellite Systems) possess the wide development space due to their global seamless coverage, much shorter transmission delays, less power requirement for the user terminals and strong ability in anti-ruin.The modern US military satellite communication system could be classified into three shop 4u blog for shirts categories: the wideband system, the protected system and the narrowband hot women's dresses system. The wideband system focuses on the traffic capacity; the protected system puts emphasis on jamming immunity, the ability of concealment and destruction resisting capacity against nuclear weapons; while the narrow band system is designed to support those subscribers in a ralph lauren polo shirts mobile or adverse condition, who need voice or low speed communication. Iridium System and Globalstar play an essential role in military communication, which belongs to the chi straightener narrow system and supports Cheap Lacoste Polo Shirts voice services, data services, etc.On the basis of the narrow system, the improved call processing spot beam determination algorithm using spherical triangles is introduced along with several formulae being deducted.
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