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随着1987年即将发射第一颗Milstar军用通信卫星,美国将从事一项巨大而复杂的军用卫星计划的改革工作,从而进入一个新的发展阶段.这种Milstar卫星可用于军事、战略、战术以及转播上,采用了毫米波频率44GHz上行中继和20GHz下行中继.这些极高频波(EHF)提供了许多优点,实际上它具有无限的信道容量,因为常规的甚高频(VHF)、300～3,000MHz超高频(UHF)、以及3～30GHz超高频(SHF)频段已过于拥挤,EHF通信具有固有的对抗敌人截获、欺骗和干扰的能力,因为其波束很窄,并且传输功率又相当低.另外,采用极高频段能使器件、机载设备以及机动的终端设备的尺寸大大减小,因此重量也随之减轻.
As soon as the first Milstar military communications satellite is about to be launched in 1987, the United States will enter a new phase of development in the reform of a huge and complex military satellite program that can be used for military, strategic, tactical and With the millimeter-wave frequency of 44GHz uplink relay and 20GHz downlink relay, these very high frequency (EHF) waves provide many advantages and in fact they have infinite channel capacity because conventional VHF, UHF frequencies of 3,000MHz and SHF frequency bands of 3 to 30GHz are overcrowded. EHF communications have the inherent ability of intercepting, cheating and interfering with enemies because of their narrow beams and comparable transmission power In addition, the use of very high frequencies enables devices, onboard equipment and mobile terminal equipment to be significantly reduced in size, thereby reducing weight.