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very high frequency

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very high frequency 【電訊】甚高頻〔略 V.H.F., v.h.f.〕。

【電訊】甚高頻〔略 V.H.F., v.h.f.〕。 “very“ 中文翻譯：   n. 維利〔姓氏〕。 “high frequency“ 中文翻譯：   【無線電】高頻(率)，高周率〔略作 H.F.〕。 “high-very-high frequency“ 中文翻譯：   上限甚高頻“frequency, very-high (vhf)“ 中文翻譯：   特高頻“propagation of very high frequency“ 中文翻譯：   甚高頻電波傳播“very high frequency band“ 中文翻譯：   甚高頻波段“very high frequency circuit“ 中文翻譯：   甚高頻電路“very high frequency communication“ 中文翻譯：   甚高頻通信“very high frequency jammer“ 中文翻譯：   甚高頻人為干擾發射機“very high frequency omnirange“ 中文翻譯：   特高頻多向導航“very high frequency radar“ 中文翻譯：   特高頻雷達“very high frequency vhf“ 中文翻譯：   特高頻“very-high frequency band“ 中文翻譯：   甚高頻段“very-high-frequency oscillator“ 中文翻譯：   甚高頻振蕩器; 特高頻振蕩器“very-high-frequency tuner“ 中文翻譯：   特高頻調諧器“vhf very high frequency“ 中文翻譯：   超高頻無線電; 甚高頻，特高頻“low power very high frequency“ 中文翻譯：   小功率甚高頻“radio telephone-very high frequency“ 中文翻譯：   無線電話“very high frequency aural omnirange“ 中文翻譯：   甚高頻可聽式全方位無線電信標“very high frequency direction finder“ 中文翻譯：   甚高頻測向器“very high frequency direction finding“ 中文翻譯：   甚高頻測向“very high frequency radio telephone“ 中文翻譯：   甚高頻無線電話“very high frequency signal generator“ 中文翻譯：   甚高頻信號發生器“very high frequency tra mitter“ 中文翻譯：   甚高頻發射機“very high frequency wave meter“ 中文翻譯：   甚高頻波長表

Upstream channels cover in 5 65mhz , which is a part of the bandwidth of high frequency （ hf ） and very high frequency （ vhf ） . it is liable to incur noises ingress onto the band . since hfc system has the tree - and - branch topology between the fiber - node and subscriber units , subscriber units belonging to one fiber - node share the same upstream channel , forming the “ noise funneling “ effect 上行頻帶位于5 - 65mhz之間，這一頻帶為高頻（ hf ）和甚高頻（ vhf ）的一部分，此頻帶易受噪聲干擾；此外，由于從光節點到用戶端為樹型分支結構，同一光節點的多個用戶共享同一信道，形成了漏斗效應。

Considerable research fruits have been achieved in the field , and a few companies in home and abroad have invented the military digital radios . a certain communication company stimulated by market competition and the demand of the current vhf ( shorted by “ very high frequency “ ) radios “ digital transform , established the “ zx08 “ project so as to conduct researches on the if digital and base - band digital signal process 軟件無線電方面，國內外已有許多研究成果，國內外公司也已研制出數字化的軍用電臺，國內某通信公司順應市場競爭要求,針對當前超短波軍用電臺數字化轉型的需要，成立編號為“ zx08 ”項目，展開中頻數字化、基帶數字信號處理研究。

“ the atis and volmet systems installed at the hong kong international airport ( hkia ) have been upgraded with datalink capability and dedicated digital communication links have been set up with the sita aircom service to enable airlines to access hong kong atis and volmet service via both very high frequency ( vhf ) and satellite datalink , “ he said 在香港國際機場裝置的自動航站情報和遠航氣象情報系統已加添數據鏈路應用功能，而專用的數據化通訊連接網絡亦已透過國際航空電訊公司提供，讓航空公司能利用高頻通訊或衛星數據鏈路，獲取香港自動航站情報服務和遠航氣象情報服務。

The outside environment of small residential area is used with very high frequency in residents “ daily residents “ daily life , which produces direct effects on residents “ daily behaviors and mental health 居住小區室外環境處于居民的日常生活圈中，是居民使用頻率和使用強度最高的環境。對居民的日常行為及其心理健康有直接影響。

very light

Direct - sequence / frequency hopping technique has important purpose in military communication and civil mobile communication area . software radio technique developed so rapidly that it is very useful to implement of very high frequency ( vfh ) multimode anti - jamming ds / fh radio on digital general platform by software radio ideology 跳擴頻通信在軍事通信和民用通信中都具有重要的意義,軟件無線電技術近幾年得到了迅速發展,應用軟件無線電的思想和通用平臺,研究超短波多模式抗干擾跳擴混合電臺的數字化實現,具有現實意義。

And i finished the layout design , chip test of line driver and equalizer in 2 . 5gbps baseband copper cable transceiver and equalizer in the 1 . 5gbps sata transceiver respectively . the main improvements and innovations in this thesis are as follows : 1 、 to design an analog equalizer tuned on - chip for 2 . 5gbps baseband copper cable transceiver ; 2 、 to present an adaptive equalizer for 1000base - cx transceiver ; 3 、 to present an auto - gain control amplifier used in the adaptive equalizer for the 1000base - cx transceiver ; 4 、 to present an adaptive continuous - time gm - c filter in very high frequency for the adaptive equalizer for the 1000base - cx transceiver 論文主要的改進和創新有： 1 、設計了適用于2 . 5gbps基帶銅纜收發器系統片上可調的模擬均衡器電路； 2 、提出了一種新的適用于千兆以太網基帶銅纜收發器系統的自適應均衡器結構； 3 、設計了甚高頻自動增益控制放大器； 4 、設計了一種適用于千兆以太網基帶銅纜接收器均衡的自適應甚高頻連續時間gm - c二階帶通濾波器。

During the last century , the vhf ( very high frequency ) communication has been applied in the ship ' s transportation , as well as radar and arpa also could identify ships in the marine . but they could n ' t adapt to the needs of the modern navigation because of their limits . the rapid development of the digital communications technology , computer technology and net ware technology supports the needed technology of ais ( automatic identification system ) 上個世紀， vhf通信技術被廣泛地應用于船舶通信；雷達、 arpa具有識別船舶的功能，但是由于自身的局限性而無法適應現代航運安全的需求；隨著數字通信技術、計算機技術以及網絡信息技術的飛速發展， ais的技術基礎已經搭建好，在航運界對助航設備的要求越來越高的情況下，船舶自動識別系統應運而生。

Upstream channels cover in 5 65mhz , which is a part of the bandwidth of high frequency （ hf ） and very high frequency （ vhf ） . it is liable to incur noises ingress onto the band . since hfc system has the tree - and - branch topology between the fiber - node and subscriber units , subscriber units belonging to one fiber - node share the same upstream channel , forming the “ noise funneling “ effect 上行頻帶位于5 - 65mhz之間，這一頻帶為高頻（ hf ）和甚高頻（ vhf ）的一部分，此頻帶易受噪聲干擾；此外，由于從光節點到用戶端為樹型分支結構，同一光節點的多個用戶共享同一信道，形成了漏斗效應。

Frequency - hopping ( fh ) is a novel spread spectrum communication technique , which develops very fast in military field due to its lpi / lpd ( low probability of intercept / detection ) properties and immunity against interferences , the extensive application of hf / vhf ( high frequency / very high frequency ) frequency - hopping radios in military has greatly enhanced the ability of military equipments against jamming and interception and ensure the safety and validity of chain of military command 跳頻技術是擴頻技術的一種，是80年代以來出現的一種新的通信方式。跳頻通信具有良好的抗干擾性，低截獲概率及組網能力，因此跳頻技術的一出現，便在軍事領域得到了極大的發展。采用跳頻技術的短波超短波電臺在軍事通信中得到了廣泛應用，極大地提高了軍事裝備的抗截獲和抗干擾能力，保證了軍事指揮系統的安全和有效性。

Considerable research fruits have been achieved in the field , and a few companies in home and abroad have invented the military digital radios . a certain communication company stimulated by market competition and the demand of the current vhf ( shorted by “ very high frequency “ ) radios “ digital transform , established the “ zx08 “ project so as to conduct researches on the if digital and base - band digital signal process 軟件無線電方面，國內外已有許多研究成果，國內外公司也已研制出數字化的軍用電臺，國內某通信公司順應市場競爭要求,針對當前超短波軍用電臺數字化轉型的需要，成立編號為“ zx08 ”項目，展開中頻數字化、基帶數字信號處理研究。

“ the atis and volmet systems installed at the hong kong international airport ( hkia ) have been upgraded with datalink capability and dedicated digital communication links have been set up with the sita aircom service to enable airlines to access hong kong atis and volmet service via both very high frequency ( vhf ) and satellite datalink , “ he said 在香港國際機場裝置的自動航站情報和遠航氣象情報系統已加添數據鏈路應用功能，而專用的數據化通訊連接網絡亦已透過國際航空電訊公司提供，讓航空公司能利用高頻通訊或衛星數據鏈路，獲取香港自動航站情報服務和遠航氣象情報服務。

By means of processing of testing data , we got high frequency tomography velocity imaging and very high frequency stacking imaging of reflects . we use crosswell tomography imaging and reflect imaging compares with sound wave , density logging and lithology analysis to complete the interpretation of crosswell seismic data result 具體內容包括原始資料編輯和井口排列規格化、初至拾取、估算速度模型、 vsp - cdp成像、 p波二維層析成像和p - p波反射剖面疊加等，論文中給出了詳細的處理流程。

Doppler very high frequency omni - directional range and distance measuring equipment ( dvordme ) system standard icao radio navigational aids used to provide bearing and distance information to aircraft and to define air traffic control routes for en - route , terminal and instrument approachdeparture procedures 這是國際民航組織指定的標準無線電導航設備，可向航機提供方向及距離的資料，并可以確定航路、終端區程序、儀表進場及離場程序等。

Additional trials on aeronautical telecommunication network ( atn ) , surface movement guidance and control system ( smgcs ) , electronic flight strips ( efs ) , secondary surveillance radar mode s data link and very high frequency data link ( vdl ) are planned for this year 此外，有關航空通訊網絡、地面活動引領管制系統、電子飛行紙條、 s模式的二次監察雷達數據鏈路和甚高頻數據鏈路的進一步試行運作，亦計劃在本年進行。

Icao make a standard of very high frequency data link mode 4 ( vdl mode 4 ) on the basis of self - organizing time division multiple access ( s - tdma ) , this standard is considered to be one of the basic solutions of aviation mobile communication 該標準基于自組織時分多路訪問技術,其主要特點是:支持實時應用,采用短消息進行信息交換,并且可以在缺少地面基礎設施的情況下保障空空通信。

Lamb waves method is mainly used to characterize thin plate materials , without using very high frequency , it can measure the velocity of transverse wave and longitudinal wave , depth of the plate , and the bonding quality between plates 蘭姆波法主要用于表征薄板類材料，無需較高檢測頻率，可以測得板中縱波和橫波的聲速、板厚和板與板之間的結合特性等，檢測精度較高。

The outside environment of small residential area is used with very high frequency in residents “ daily residents “ daily life , which produces direct effects on residents “ daily behaviors and mental health 居住小區室外環境處于居民的日常生活圈中，是居民使用頻率和使用強度最高的環境。對居民的日常行為及其心理健康有直接影響。

The third generation of mobile communications ( 3g ) is a great revolution in the history of mobile communications , which can provide multimedia service to the mobile users with very high frequency efficiency 第三代移動通信( 3g )是移動通信發展史上的一次重大革命，它將以很高的頻譜利用率向移動用戶提供寬帶多媒體業務。

Secondly , the concept of tacan system is introduced , especially the vor ( very high frequency omni - directional range ) composite signal is discussed in details 其次，對塔康系統的組成和原理的進行介紹，尤其對其中vor ( veryhighfrequencyomni - directionalrange甚高頻全向信標)復合信號進行比較詳細的研究。