在新加坡，每辆轿车上都装有一台在通过时自动触发过路收费亭的数字式异频雷达收发机。
In Singapore, every car is fitted with a digital transponder that triggers automatic tollbooths as it passes.
批准可进入林区的徒步旅行者将被佩戴上异频雷达收发机，这样探测器就能识别出他们的身份，这是通过军用飞机上的“敌友身份识别”系统来完成的。
Authorised hikers through the park will be given transponders that tell the detectors who they are, as with the "identification friend-or-foe" systems on military aircraft.
经过批准的森林旅游者们可以领到一个异频雷达收发机，这个收发机可以使探测器确认旅游者的身份，就像战机上经常有配备的“敌友认证”系统一样。
Authorised travelers through the park will be given transponders that tell the detectors who they are, as with the "identification friend-or - foe" systems on military aircraft.
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