Echo
美国空军 · Thor Delta · 17A 号发射工位 (SLC-17A)
任务简介
Echo 1 航天器是一个直径 30.48 米、厚度 0.0127 毫米的聚酯薄膜气球。该航天器被设计为用于跨大陆和洲际电话（语音）、广播和电视信号的无源通信反射器。它搭载了 107.9 MHz 的信标发射机用于遥测，这些发射机由安装在气球上的 70 块太阳能电池板充电的五节镍镉电池供电。由于航天器具有较大的面积质量比，可以获取用于计算大气密度和太阳压力的数据。在任务后期，该航天器还被用于评估卫星三角测量的技术可行性。Echo 1 在发射后的滑行阶段失败，原因是第二级姿态控制喷气装置失效，航天器未能进入轨道。Echo 1A 是成功重新发射的版本。
原文
The Echo 1 spacecraft was a 30.48 m diameter balloon of mylar polyester film 0.0127 mm thick. The spacecraft was designed as a passive communications reflector for transcontinental and intercontinental telephone (voice), radio, and television signals. It had 107.9 MHz beacon transmitters for telemetry purposes. These transmitters were powered by five nickel-cadmium batteries that were charged by 70 solar cells mounted on the balloon. Because of the large area-to-mass ratio of the spacecraft, data for the calculation of atmospheric density and solar pressure could be acquired. The spacecraft was also used to evaluate the technical feasibility of satellite triangulation during the latter portion of its life. Echo 1 failed during the coast period after launch, as the attitude control jets on the second stage failed and the spacecraft did not achieve orbit. Echo 1A was a successful relaunch.
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