任务档案 · MISSION
NROL-4 (Trumpet 3)
美国空军 · Titan 401A Centaur · 41 号发射工位 (SLC-41)
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Trumpet信号情报卫星由Titan-4(01)A Centaur-T火箭发射至高度椭圆形的Molniya型轨道。在椭圆轨道上，它们大部分轨道周期内会在北半球上空缓慢移动，从而能够截获微波视距通信波束。由于在轨道中会缓慢穿过波束，因此需要一组这样的卫星星座来全天候监视苏联的通信。
原文
Trumpet signal intelligence satellites were launched by Titan-4(01)A Centaur-T into highly elliptic Molniya-type orbits. In their elliptical orbits they would move very slowly over the northern hemisphere for most of their orbital period, allowing interception of microwave line-of-sight communications beams. Since they would move slowly through the beams during their orbit, a constellation of such satellites was required to monitor Soviet communications throughout the day.
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