By emulating the global traffic service through a LEO satellite mobile communication system under different access schemes, the performance of the networks are analyzed.

并参照某实际系统参数，对不同接入方案准则下的全球话务服务进行了系统仿真，得到了相应的系统性能参数。

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The report calls for accelerating the use of the global positioning satellite system (GPS) in U.S. airspace and ultimately linking GPS and the air traffic control system to provide better and safer separation for planes flying in the United States.

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