在20世纪，无线电信标台与卫星网络让飞机和船舰确定其位置。
In the 20th century, radio beacons and satellite networks allowed aircraft and ships to determine their position.
用TOA法获得定位中需要的时间测量值，从而得到各信标台的距离差；
The TOA algorithm is used to obtain the time measuring values required in the location procedure and thus obtain the difference of interval of each beacon achieved.
塔康信标台全向发射脉冲幅度调制信号，隐含空中目标相对于信标台的方位和距离信息。
TACAN beacon transmits pulse amplitude modulation signals in all direction, including bearing and distance information relative to the beacon.
发射无方向信号的无线电信标台。据此飞行员能够用自动定向仪 （ADF ）确定他的背台或向台方位。
A radio beacon which transmits nondirectional signals whereby the pilot can use the ADF to determine his bearing to or from the station.
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.
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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