The passive radio astronomy service (RAS) is studying natural phenomena producing radio emissions at frequencies fixed by the laws of nature. Primary allocations have been made to various space services in the Earth-to-space direction such as the fixed-satellite service (FSS), radionavigation-satellite service (RNSS), mobile-satellite service (MSS) and broadcasting-satellite service (BSS) in bands adjacent or nearby to bands allocated to the RAS.
ITU-R REPORT SM.2091-2007由国际电信联盟 IX-ITU 发布于 2007-01-01。
ITU-R REPORT SM.2091-2007 在中国标准分类中归属于: M21 各种通信业务服务,M36 无线电通信设备。
* 在 ITU-R REPORT SM.2091-2007 发布之后有更新,请注意新发布标准的变化。
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