Due to steady phase error, low-order PLL has a trouble in tracking frequency ramp signals, so that the receiver cannot lock carrier signals.

低阶锁相环跟踪频率斜升信号时产生的稳态相差致使环路失锁，接收机无法锁定载波信号。

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As IBM noted in its press release today, RFID tags (Radio Frequency Identification sensors) are becoming particularly popular for the purpose of item tracking and authentication.

IBM今天在其发布会上称RFID(无线射频识别)标签在物品跟踪和识别领域的应用将越来越广泛。

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Radio frequency identification (RFID) and more sophisticated technologies for product tracking within supply chain management systems are being experimented in some countries.

一些国家目前正尝试在供应链管理系统内通过无线射频识别和更复杂的技术来追踪产品。

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As the frequency of tracking has increased, more judges have raised the need for search warrants.

WSJ: Judges Challenge Phone Location Tracking

Radio frequency identification and tracking technology were undreamt of just a few years ago.

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It also likes companies that are working on making smaller batteries, like Qynergy, a New Mexico-based company working on radioisotope batteries, and Infinite Power Solutions, a Colorado developer of thin-film batteries that can power RFID (Radio Frequency Identification) tracking chips.

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