查询词典 UHF

Mostly it is only the VHF and UHF aficionado who has to be greatly concerned about these properties.

主要是这仅仅是高频和超高频爱好者谁，必须十分关注这些物业的价值。

It is found in field detection that ultra high frequency signals can diffract from the joint of transformer. The feasibility of using external UHF sensor for detecting partial discharge activities is discussed, and the external propagation characteristic of UHF electromagnetic wave is investigated via the lab experiment.

针对变压器箱体的接缝处可以衍射出局部放电特高频电磁波信号的现象，在分析变压器箱体接缝对局部放电特高频电磁波传播影响的基础上，探讨了接收天线外部检测特高频信号的可行性，并通过实验研究了局部放电特高频电磁波的外传播特性，通过对信号进行小波包分析，比较了外部接收和内部接收信号的差异。

A new approach for pattern recognition of ultra-high frequency signals of transformer partial discharge based on multi-scale analysis of wavelet packet and grid dimensionality is proposed, in which the multi-scale transform of wavelet packet is used to extract wavelet coefficients of UHF PD signals and by means of improving difference box-counting method the grid dimensionality of multi-scale wavelet coefficients is calculated and the multi-scale grid dimensionality is taken as the characteristic quantity that is used in the recognition of UHF PD signals.

提出了一种基于小波包多尺度分析和网格维数的变压器局部放电超高频信号模式识别的新方法，采用小波包多尺度变换提取局部放电超高频信号在多尺度上的小波系数，通过改进差盒计数法计算多尺度小波系数的网格维数，并将多尺度网格维数作为特征量用于局部放电超高频信号的识别。

A signal disposal cell based on Frequency Mixing is designed in this dissertation, it can reduce the frequency of original UHF signal to facilitate a common sample card and it is not at the expense of Peak-Value and phasic character of original UHF signal.

本文设计了基于混频技术的信号调理单元，降低了超高频信号的频率，方便普通的采集卡采集，同时保留了原始的峰值相位的特征。

This system works on UHF frequency brand, use PLL circuit. There are 256 frequencies for your option.

本机工作在UHF频率，采用 PLL锁相环电路，预设 256 个可选择使用频率。

It analyzes the propagation characteristic of the UHF signal in GIS using the experimental method and XFDTD emulation method.

UHF方法是目前公认的监测GIS最有效和最有前途的方法。

Surprising with the introduction of UHF they continued to function quite well in picking up UHF as well.

惊奇以他们继续起作用相当很好在采摘超高频超高频的介绍。

These were the super-components of that gray world between UHF and microwave frequencies.

这就是使雷达可以在UHF和微波频段工作的超级组件。

This paper studies key components of UHF band RFID systems, which includes reader, tag and relevant antennas.

近年来，射频识别技术，特别是UHF频段的反射调制式RFID技术的研究与应用发展较快。

Therefore radio monitoring stations HF station, VHF/UHF station and SHF station, etc.

第四章设计出了一套长春地区VHF/UHF无线电监测网组建的完整解决方案。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。