high frequency communication 中文意思是什麼

high frequency communication 解釋
短波通信
  • high : adj 1 高的〈指物，形容人的身高用 tall〉；高處的；高地的。2 高級的，高等的，高位的，重要的。3 高尚...
  • frequency : n. 1. 屢次，頻仍，頻繁。2. （脈搏等的）次數，出現率；頻度；【物理學】頻率，周率。
  • communication : n. 1. 通訊，通知；交換；信息；書信，口信，通報。2. 傳達，傳授；傳播；傳染。3. 交通，交通機關；聯系，連絡（設備）。4. 【宗教】接受聖餐。
  1. The ionosphere is a complex medium, which is aeolotropy, asymmetry, dispersive and changes randomly with time. in order to improve the communication quality of the shortwave that depends on the ionosphere, we should have aknowledge of the current condition of the ionosphere in real time. the backscatter sounding of high frequency can diagnose the real - time channel characters for shortwave communication or hf radar, which is great assistant to shortwave communication and hf radar

    電離層是隨機時變，各向異性，非均勻、色散的復雜介質。為了保證依賴于電離層進行的短波通信質量，必須了解電離層的實時狀態信息。高頻返回散射探測可以實時監測與短波通信或高頻天波雷達相關的天波傳播通道的狀態，對短波通信和天波雷達工作起了重要的輔助作用。
  2. The catv charge and control system has excellent compatibility with other signals and no astriction in signal format, so you doesn ` t need to worry about its future. the system involves many technical fields, including controls of computer 、 communication 、 high frequency of electric circuits, and now it serves for more than 1, 000, 000 customers

    該系統涉及多個研究領域，包括計算機控制、通信、高頻電子電路等多個領域的知識，涉及用戶多達60萬戶。
  3. Mixers are the key components of many microwave and millimeter - wave systems. the super - heterodyne receiver is always applied in modern communication system, mixer becomes the key component as is at the first part of system. but it is more and more difficult to get the choiceness lo source of the same band with the system is working at high frequency especially in the millimeter - wave. sub - harmonic mixer is a good solution to this problem now. in this circuit we need just half 、 quarter 、 even 1 / 8 of the rf signal frequency. in this paper the design and fabricate of sub - harmonic hmic mixers ( 2, 4 ) at w - band are introduced

    混頻器是微波通信、射電天文學、雷達、等離子物理、遙控、遙感、電子對抗，以及許多微波測量系統中至關重要的部件。在現代通信系統中，毫米波頻段通常採用超外差接收機，混頻器作為第一級就成為關鍵部件。由於在毫米波頻段，同頻段高性能的本振源成本高，技術難度大，採用分諧波混頻技術是解決此問題的有效途徑，只需射頻頻率1 / 2 、 1 / 4甚至1 / 8的本振頻率即可實現混頻。
  4. In this thesis, for the merits of high frequency spectrum utility factor and high - speed data communication, the ofdm is introduced into the underwater acoustic communication. combined with fec to combat the frequency - selective fades and isi in the underwater acoustic channel, high speed data transmission is realized by employing ofdm technology

    本研究嘗試將ofdm技術引入水聲通信領域，利用該技術頻譜利用率高，多載波并行傳送的特點，結合通道編碼，以克服水聲通道多徑干擾引起的頻率選擇性衰落和碼間干擾，獲得高速率數據傳輸。
  5. Very high frequency communication

    甚高頻通信
  6. 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 ( high frequency ) frequency - hopping radios in military has greatly enhanced the ability of military equipments against jamming and interception and brought up a new austere challenge for communication countermeasures

    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，採用跳頻技術的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，向通信對抗提出了嚴峻的挑戰。
  7. As to the frequency domain methods, the physical significations of the h performance targets, the selection strategy of the weighting functions, loop - shaping and standard problems of robust h control are discussed. frequency domain design methods of robust h control are also introduced to solve the congestion control problem of the high - speed communication networks, which based on flow rate control

    頻域方法方面研究了h性能指標的意義、權函數的選取、迴路成形及h控制標準問題；最後把h控制頻域設計方法應用於解決高速通信網路基於流速的擁塞控制問題。
  8. Tantalum lithium ( litao3 ), a novel single crystal material, developed and industrialized with the development of communication and information industries recently, owns the excellent performances such as high mechanical - electrical coupling coefficient, lower wear - resistance, excellent high - temperature stability, excellent high - frequency capability, etc. however, researches on tantalum lithium single crystal wafer around world are still lacking

    鉭酸鋰是近年來隨著通訊、信息產業迅速發展而開發並產業化的新型光電子材料。它具有機電耦合系數大、低損耗、高溫穩定性、高頻性能好等優良的壓電、電光和熱電性能。
  9. Design of impendence match for high frequency power amplifier of mine mobil communication system

    礦井移動通信系統高頻功放環節的阻抗匹配設計
  10. It point out the resolving methods of the high frequency communication characteristic and its attenuation of the distribution network are the new research field

    指出電網的高頻通信特性及其抗干擾、抗衰耗對策是獨立於高性能載波晶元的研究領域。
  11. Short wave is used for wireless communication which the wavelength is from 10m - 100m. in fact, the high frequency part of medium wave usually belongs to short - wave band. so many short wave communication equipments ’ band was extended to 1. 5 - 20mhz

    實際上，許多人也把中波的高頻段（ 1 . 5 - 3mhz ）歸到短波波段去，所以現有的許多短波通信設備，其波段往往擴展到1 . 5 - 20mhz 。
  12. High - frequency and microwave bipolar power devices have been largely applied in military and civil electronic equipment, mainly in communication, radar ( including navigation ) and electron - confrontation field

    雙極高頻、微波功率器件已大量應用於軍用、民用電子設備中，其典型應用主要在通信、雷達（含導航）和電子對抗等領域。
  13. Laser - diode end - pumped solid - state laser has many advantages, including high efficiency, good beam quality, high frequency stability, narrow line width, long lifetime, compact configuration, convenient for using et al. especially, single - frequency solid - state laser sources are required for many fields of fundamental research and scientific application, such as gravity - wave detection, coherent laser radar, coherent communication and fiber sensing

    激光二極體泵浦的固體激光器具有全固態、小型化、效率高、使用方便等優點而受大家的廣泛關注，尤其是實現單頻運轉的全固態激光器以其優良的頻率特性和輸出功率穩定性可廣泛應用在相干信息處理、頻率計量、量子光學、引力波測量和量子信息等研究領域。
  14. Jingke information principally engages in manufacturing high frequency quartz oscillators used in various types of timers, wireless communication equipment and computers

    晶科信息主要從事生產各類定時器無線電通訊器材及電腦等電子產品用石英晶體頻率器。
  15. High - frequency circuits for portable telephones, personal handphone systems ( phs ), pagers, or other mobile communication appliances

    高頻線路應用於手機，個人通訊系統，呼叫器，或者其他行動通訊設備的需求
  16. High frequencyvery high frequencyultra high frequency ( hfvhfuhf ) communication equipment this includes the radio transmitters and receivers operating on various frequencies used for both long - range and short - range airground communications with aircraft

    這類儀器包括無線電發射器和接收器，可在不同頻道與航機作長程和短程的地對空通訊。
  17. 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

    該標準基於自組織時分多路訪問技術，其主要特點是:支持實時應用，採用短消息進行信息交換，並且可以在缺少地面基礎設施的情況下保障空空通信。
  18. " 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路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。
  19. The technology of very low bit rate for hf ( high frequency ) communication means that, one technology of ecm ( electronic counter measures ) resistant communication is developed for low bit data message exchange in the time of battle which data communication is destroyed by electronic disturber. it is regarded by armies in the battle of information, because that it can overcome the very low snr ( signal noise ratio ), very high narrow - band interference and multipath with maxium delay of fifty millisecond

    短波最低限度通信技術是在戰時強電磁干擾情況下能實現保證最低限度的數據報通信的一種抗干擾通信技術。由於其能有效的克服極低信噪比、較強的窄帶干擾和幾十毫秒的多徑，在信息戰中受到各軍高度重視。
  20. 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於船舶通信；雷達、 arpa具有識別船舶的功能，但是由於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、計算機技術以及網路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。
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