eye-tracking devices 眼球追踪装置
gps tracking devices 求购全球定位系统跟踪装置
automatic sun-tracking devices 太阳自动跟踪器
The working principle of passive mode is that detecting and tracking devices, without sending any signals, obtain the information about the targets only by the detecting signals producing from the targets.
被动式探测的工作原理是探测与跟踪装置本身不发出信号,仅探测目标本身产生的信号来获得目标的信息。
参考来源 - 一种空中目标参数估计方法的仿真·2,447,543篇论文数据，部分数据来源于NoteExpress
Customers will buy miles in advance and renew as needed - without vehicle tracking devices.
消费者提前购买英里数，并在需要时进行补充——无需车辆跟踪设备。
They put tiny tracking devices and cameras on the birds' backs and then followed their movements using global positioning systems.
他们在鸽子背后放置微型跟踪设备和摄像机，然后运用全球定位系统追踪它们的行动。
Until recently, only larger birds could be followed using tracking devices, because the gadgets were too big and heavy to attach to small birds.
近年来，因为追踪器的设计较大或较重，无法附着在小型鸟类身上，只能对较大型的鸟类进行追踪
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