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。
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。
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。
IBM has a rival offering, as well as one using radio-frequency identification (RfID) chips, which are embedded in packaging to detect tampering and allow precise tracking.
IBM也有一款与之竞争的产品，还有一种产品使用射频识别芯片，芯片植入包装之中，可以检测出篡改，并实现精确追踪。
Another effective fix is the electronic tracking of medications and patients with radio-frequency identification (RFID) tags or bar codes.
另一种有效的办法，是利用药物治疗的电子追踪、和病人身上配戴的电子标签(radio -frequency identification,RFID)或条码。
The Phalanx operator used the Block 1b's surface mode to perform electro-optical tracking and the system's radio frequency sensors to provide range data to the LaWS.
Phalanx操作人员使用Block1b的表面模式进行光电跟踪，系统的射频传感器为LaWS提供范围数据。
A software based frequency tracking algorithm for protective relaying is analyzed thoroughly. in this paper, the availability of this algorithm under the non-noise condition is proved.
全面分析了一种保护用软件频率跟踪算法的性能，论证了在无噪声干扰的情况下该算法的有效性。
The wireless technology, called radio frequency identification (RFID), has been used in thousands of stores for tracking inventory and in identification chips implanted in some pets.
这种无线技术称为无线电频率识别(RFID)，曾在成千的存储器运用追踪以及在正电子发射体层摄影的鉴定植入芯片中鉴定识别。
The' main factors resulting in local frequency tracking error are analyzed based on the principles of the tracking local oscillator for frequency agile radars of rotary tuning magnetron type.
本文从旋转变频磁控管式频率捷变雷达的本振频率跟踪原理出发，分析了产生本振频率跟踪误差的主要因素。
The system uses time-frequency tracking loops to extract phase errors from data subcarriers with frequency interpolation to compensate for the estimated carrier frequency offsets.
该方法使用了时频同步跟踪环路，从数据子载波提取相位误差，并利用频域插值补偿多个用户的估计频偏。
Frequency tracking is an important characteristic of ultrasonic power.
频率跟踪是超声波电源的一个重要特性。
Frequency tracking circuit is one of the special circuits used in the ultrasonic generator.
频率跟踪电路是超声波发生器中的一种特殊电路。
Frequency automatic tracking and amplitude stabilizing are two important characteristics of ultrasonic machining power.
频率跟踪和恒定振幅控制是超声加工电源两个重要的特性。
And the power amplifier can realize accurately tracking and amplification for ac signals with frequency range up to 1000hz.
功率放大器可以实现交流信号的准确跟踪和放大，输出频率范围可达1000赫兹。
For the limitation of the accuracy of IFM technology, the frequency tracking accuracy can't be examined directly.
由于现有瞬时测频技术精度的限制，无法直接对其频率跟踪精度进行检定。
Frequency offset tracking is one of the key technologies that affect OFDM systems' performance.
频偏跟踪是影响到OFDM系统性能的关键技术之一。
In this paper, a blind multiuser receiver for frequency-selective fading channel based on subspace tracking has been presented.
提出一种基于信号子空间估计，用于频率选择性衰落信道的盲多用户自适应接收机。
The study shows that the algorithm can complete frequency offset tracking in AWGN channel and multipath fading channel.
研究表明，该算法既能在AWGN信道中也能在多径衰落信道中完成频偏跟踪工作。
Fluid density is measured by self push resonant principle and frequency tracking method.
流体密度的检测是采用自激振荡原理和频率跟踪法得到的。
The working processes of the frequency-tracking phase-shift PWM controlled full bridge power supply load series resonant type DBD ozone generation power system are analyzed.
系统的分析了频率跟踪移相PWM控制全桥供电的串联谐振负载式DBD型臭氧发生器电源系统的工作过程。
Fluid density is measured by self-push resonant principle and frequency tracking method.
流体密度的检测是采用自激振荡原理和频率跟踪方法得到的。
The method consists of real-time estimation of signal frequency, synchronous tracking of sampling frequency and error correction of harmonic coefficients.
该方法包括信号频率实时估计、采样频率同步跟踪和谐波系数误差校正几个要素。
The image forming and disposing time delay of TV tracker and sample frequency affect tracking capability of TV tracking system directly.
由于电视跟踪器图像信号建立、图像处理等原因造成的延时和采样频率直接影响了电视跟踪伺服系统的性能。
DDS and digital phrase-lock technology have been applied in FPGA to improve the accuracy of frequency tracking.
采用高精度的直接数字频率合成（DDS）和数字锁相环技术，实现了高频率跟踪精度。
The ventricular rate will ascend following the increase of sinus rate, having frequency tracking function. The exercise tolerance of patient will be increased.
心室率随窦性频率的增加而增加，具有频率跟踪作用，增加了病人运动耐量。
Based on orthogonal transform, a new method of tracking power grids frequency has been provided.
基于正交变换，提出了一种新的电网频率跟踪方法。
Bases on the IIFM technique, the principle and method to measure the local oscillator tracking accuracy of frequency - agile radar is put forward in this paper.
在介绍瞬时中频测试技术的基础上，介绍利用瞬时中频测试技术对捷变频雷达本振跟踪精度进行测试的原理和方法。
It is traditional to use frequency tracking to realize integer period sampling.
传统的解决方法是采用频率跟踪技术实现采样的整周期性。
An adaptive sampling frequency tracking algorithm which adapt to realization of precise real time harmonic analysis is introduced.
提出了一种适于高精度实时电力谐波分析的自适应调整采样频率的电网频率跟踪算法。
An adaptive sampling frequency tracking algorithm which adapt to realization of precise real time harmonic analysis is introduced.
提出了一种适于高精度实时电力谐波分析的自适应调整采样频率的电网频率跟踪算法。
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