ITU-R INFORME BT 956-2 SPANISH-1990 Data broadcasting systems signal and service quality field trials and theoretical studies《数据广播系统 信号和服务质量的现场试验和理论》.pdf

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ITU-R RAPPORT M 766-2 FRENCH-1990 Feasibility of frequency sharing between the GPS and other services《全球定位系统和其他服务之间的频率共享的可行性》.pdf

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