飞机从一个地面信标到下一个信标曲折飞行，在每一阶段都要经过地面的许可才能上升和下降。
Planes must zigzag from one ground beacon to the next, and ascend and descend in steps at each stage obtaining permission from the ground.
生成控车命令功能测试——车载控制器接收信标传来的地面状态信息产生控车命令。
To generate train control commands, carbone-controller receives variant messages from the trackside through the beacon and then generates train control commands.
但他也可以选择使用机器人：在小男孩的书包里放入一个信标台，足球大小的无人飞机会盘旋在距地面几米高的地方，一直跟着信号。
But he can use a robot too: a football-sized drone, hovering several metres off the ground, follows a beacon stashed in the little boy's school bag.
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