ITU-R INFORME M 1186 SPANISH-1990 Use of frequency band 4 200 MHz to 4 400 MHz by radio altimeters《通过无线电高度表使用4200 MHz至4400 MHz频带》.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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