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| 空中交通管制雷达信标; system空中交通管制雷达信标系统 (一种雷达系统,在其中所有被探测到的目标均具有雷达接收/发射机或应答机形式的配对设备，在配对工作设备中，由询问器“发射/接收机”发出的无线电脉冲被接收到之后，立即被用于触发应答机发出识别信号，这种非反射性质的传送信号将由发射/接收机或询问器接收。询问的工作频率为1030 MHz,相应的应答机信号频率为1090 MHz,该系统装有自动高度报告装置) | |||
| air traffic control radar beacon: 5 phrases in 3 subjects |
| Aviation | 3 |
| Navigation | 1 |
| Space | 1 |
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