1) Hi-VHF (high-very-high frequency)
上限甚高频(148-174兆赫)
2) ultra-high frequency
超高频(300-3000兆赫)
3) megahertz frequency
兆赫频率
4) maritime very high frequency band
海上甚高频波段
5) Very High Frequency(VHF)
甚高频
1.
An on-line monitoring system for partial discharge of generators was introduced,which was based on the Very High Frequency(VHF) measuring technology and the time-delay identification anti-interference principles.
介绍了一种基于甚高频测量技术和时延鉴别抗干扰原理的发电机局部放电在线监测装置,分析了装置采用的抗干扰方法。
2.
It is concluded that the signal-to-noise ratio(SNR)is higher when the frequency band is 5～50 MHz;the single impulse sequence comparing method based on very high frequency(VHF)testing technique and dual transducer coupling is efficient in interference rejection.
最后得出:5~50MHz的测量频带的信噪比较高,基于甚高频测试技术和双传感器耦合的单个脉冲时序对比法抗干扰效果良好。
6) VHF
[英][,vi: eɪtʃ 'ef] [美]['vi 'etʃ 'ɛf]
甚高频
1.
DESIGN AND DEVELOPMENT OF ARC/INFO BASED VHF COMMUNICATION OVERLAY SYSTEM;
基于ARC/INFO的甚高频通信覆盖评估系统的设计和开发
2.
Design of a VHF Frequency Synthesizer;
一个甚高频频率合成器的设计
3.
This paper describes the advantages of selection of carrier current frequency for SQUID in very high frequency (VHF) bands in order to improve magnetic sensitivity of 77K superconducting quantum interference device (SQUID) magnetometer.
本文阐述了为提高 ７７Ｋ超导量子干涉器（ｓｕｐｅｒｃｏｎｄｕｃｔｉｎｇ ｑｕａｎｔｕｍ ｉｎｔｅｒｆｅｒｅｎｃｅ ｄｅｖｉｃｅ简称ＳＱＵＩＤ）磁强计的磁场灵敏度，选择 ＳＱＵＩＤ载波电流频率在甚高频（简称 ＶＨＦ）频段的优点，并介绍了在 ＳＱＵＩＤ磁强计电路中采用频率合成及锁相技术来实现电路低噪声的工作原理，使磁测有比较高的信噪比。
补充资料：频率计量(见时间频率计量)
频率计量(见时间频率计量)
frequency metrology: see time and frequency metrology
口n IQ liliang顷率频率计皿(f比quency metrolo盯) 计t。见时闰
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条