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Voices from the Heavens

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These spacecrafts are owned by just a handful of nations: France, Germany, India, Italy, Japan, the People's Republic of China (PRC), Russia, the United Kingdom and the United States. The United States has the largest fleet, comprising 41 Military Satellite Communications (MILSATCOM) spacecraft. She is followed by Russia which possesses 38 such satellites, the United Kingdom which has eight, France which has two; the same number as Italy including the SICRAL-3 satellite it jointly owns with France. Germany possesses two dedicated MILSATCOM platforms as does India and the PRC with Japan and Spain each owning a single spacecraft for military communications. These satellites use a plethora of wavebands to provide communications. These inhabit the Ultra High Frequency (UHF) segment of the electromagnetic spectrum principally frequencies of 240 megahertz/MHz to 270MHz which also encompasses L-band (1.3 gigahertz/GHz to 1.7GHz) SATCOM. Super High Frequency (SHF) SATCOM covers a waveband of three gigahertz/GHz up to 30GHz and encompasses S-band (1.980GHz to 2.010GHz uplink/2.170GHz to 2.200GHz downlink), C-band (5.925 to 6.425GHz uplink/3.7 to 4.2GHz downlink), X-band (7.9GHz to 8.4GHz uplink/7.25 to 7.75GHz downlink), Ku-band (14GHz uplink/10.9GHz to 12.75GHz downlink) and Ka-band (26.5GHz to 40GHz uplink/18GHz to 20GHz downlink). Extremely High Frequency (30GHz to 300GHz) wavebands are also used for military SATCOM, particularly by the United States.
机译:这些航天器仅由少数几个国家所有:法国,德国,印度,意大利,日本,中华人民共和国(PRC),俄罗斯,英国和美国。美国拥有最大的机队,包括41架军事卫星通信(MILSATCOM)航天器。紧随其后的是拥有38颗此类卫星的俄罗斯,拥有8颗卫星的英国,拥有2颗卫星的法国。与意大利相同,包括与法国共同拥有的SICRAL-3卫星。德国拥有两个专用的MILSATCOM平台,印度和中国也拥有两个平台,日本和西班牙分别拥有一个用于军事通信的航天器。这些卫星使用大量波段来提供通信。它们居住在电磁频谱的超高频(UHF)段中,频率主要为240兆赫兹/ MHz至270MHz,其中还包括L波段(1.3千兆赫兹/ GHz至1.7GHz)SATCOM。超高频(SHF)SATCOM覆盖高达30GHz的三个GHz / GHz波段,并涵盖S波段(1.980GHz至2.010GHz上行链路/2.170GHz至2.200GHz下行链路),C波段(5.925至6.425GHz上行链路/3.7至4.2 GHz下行链路),X波段(7.9 GHz至8.4 GHz上行链路/7.25至7.75 GHz下行链路),Ku频段(14 GHz上行链路/10.9 GHz至12.75 GHz下行链路)和Ka频段(26.5 GHz至40 GHz上行链路/ 18 GHz)至20GHz下行链路)。军事SATCOM也使用了极高频(30GHz至300GHz)波段,尤其是在美国。

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  • 来源
    《Military technology》 |2020年第1期|50-54|共5页
  • 作者

    Thomas Withington;

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  • 入库时间 2022-08-18 05:01:35

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