After two days of silence ground control teams received a signal that the spacecraft had put itself into an emergency standby mode.
经过两天的沉默，地面控制队接到信号的飞船把自己变成了紧急待命模式。
Operation mode can be divided into the upper and lower control and ground single control, but also point up point drop, multilayer control.
操作方式可分为上下控制和地面单人控制，也可点升点降、多层控制。
This proves that the one-dimensional trajectory amendments mode of ground radar surveillance and progroud fire-control center control is entirely feasible and can achieve low-cost and miniaturization.
由此可见，采用地面雷达导航、由地面火控中心发射指令的一维弹道修正方式完全可行，并可以做到低成本，小型化。
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