l band 中文意思是什麼

l band 解釋
l波段
  • l : L-beam, L-iron 不等邊角鋼。L,￡＝ 〈拉丁語〉 libra （＝ pound）。
  • band : n 1 帶，繩；帶形物；箍；箍條；嵌條；鑲邊；鋸條； 〈pl 〉 （法官等的）寬領帶。2 束縛，羈絆；義務；...
  1. Implementation of an l - band fh signal generator

    波段跳頻信號源的設計與實現
  2. In the non - coaxial bwo of l - band, the radius of the slow - wave structure is very large, and the volume and weight of the guiding - magnetic system are also very large. thus, the non - coaxial bwo of l - band is bulky and lumbersome and is inconvenient for real application

    若採用非同軸相對論返波振蕩器實現l波段的微波輸出，則要求慢波結構的平均半徑很大，導引磁場系統的體積和重量會變得較大，這給器件的小型化帶來了很大的困難。
  3. A noise figure improved l - band edfa based on hi - bi ( high birefringence ) fiber loop mirror as ase rejecter is presented for the first time

    主要工作如下: 1 .首次提出了基於雙折射光纖環鏡優化l - bandedfa噪聲性能的方案。
  4. The carrier wave is modulated directly by the baseband signal at several frequency point in l band and s band. firstly, this paper clarifies the theory of i / q modulation, elaborates evm and acpl, and analyzes the effect of amplitude and phase unbalance and dc offset on evm. secondly we review the basic principle of phase locked loop and it ’ s composing parts, including the basic conception and design method of pll frequency synthesizer, especially introduce the charge pump pll frequency synthesizer in detail

    首先，在闡述i / q正交調制基本原理的基礎上，通過對誤差矢量和鄰近通道功率泄漏的詳細分析，定性、定量地討論了各種非理想電路因素（如相位不平衡、幅度不平衡、直流偏差等）對調制器性能的影響;其次，介紹了鎖相環的工作原理和基本組成部分，包括鎖相環的設計和環路濾波器的設計，特別詳述了電荷泵鎖相頻率源;第三，介紹了採用直接調制技術模擬衛星信號的射頻前端的設計;最後，對整個直接射頻調制系統進行測試，結果基本上達到了課題要求。
  5. Aeronautical mobile satellite services communications ground earth station - general technical requirements c l band

    航空移動業務衛星通信地面地球站總技術要求c l頻段
  6. Comparison of radiosonde observation and l - band radar data and 59 - 701 system

    電子探空儀系統對比觀測分析
  7. Particle simulation of compact l - band coaxial relativistic backward wave oscillator

    波段同軸相對論返波振蕩器的粒子模擬
  8. Type gtp002 and gtp002a l band coaxial isolators detail specification for

    Gtp002 gtp002a型l波段同軸隔離器.詳細規范
  9. Proposed by the european broadcasting union, eureka 147 is widely applied in europe, canada and part of asia. the technology operates in the new l - band or vhf band iii. its 1. 5 mhz bandwidth can accommodate a maximum of about 1. 2 mbps of data

    Eureka147是現時歐洲廣播聯會（ europeanbroadcastingunion ）推廣的制式，被歐洲、加拿大和部份亞洲地區所採用，它的設計是需要另外在新的Ｌ頻帶或甚高頻帶vhfbandiii操作，頻寬1
  10. Rthk tested dab in l band in 1998. since then, dab technologies have undergone improvements ; rthks current test of dab vhf band iii is expected to offer a better indoor and outdoor performance. moreover, the price of the receivers has gone down substantially

    港臺於1998年測試dab時，是以l頻帶l band進行，這幾年來dab技術上有所改進，今次dab測試極高頻帶vhf band iii ，相信有較佳的室內和室外接收的效果，而接收器的價格也經已回落。
  11. Dsb offers the industry including public broadcasters a means of providing more choice. rthk, together with the information technology and broadcasting bureau, hong kong commercial radio metro broadcast corporation, ran tests on digital signals in 1998 on l - band originally from two transmitter sites mount gough and beacon hill

    早於1998年，香港電臺聯同當時的資訊科技廣播局商業電臺及新城電臺，首次於港島的歌賦山及九的畢架山設置發射器，共同以歐洲廣播聯會制定的eureka 147制式測試數碼聲音l band廣播。
  12. A significant level of 3galt - 1 transcript was present in the brains of 18 - day - old mouse embryo, newborn and 1 - week - old mice. hereafter, its level decreased markedly. densitometry analysis indicated that the p3galt - l band was 10 - fold more intensive in the 1 - week - old mouse brain than that in the 12 - week - old, indicating that 3galt - l mrna was expressed at a developmentally regulated way

    我們用northernblot的分析方法發現在18天齡胚鼠、新生鼠和1周齡鼠的腦組織中3galt - 1表達很高，隨著發育進程，它的表達水平明顯降低：灰度掃描定量分析表明1周齡鼠腦中3galt - 1的表達量大約是12周齡鼠腦表達水平的10倍，這說明3galt - 1的表達是受發育調控的。
  13. The methods and the experimental setups for measuring the gain and noise figure of an edfa are emphasized. we introduce how to measure the characteristics of each component of an edfa, especially the gain and absorption coefficient of an erbium doped fiber ( edf ). thirdly, four types of simple and novel l - band edfa structures with low noise, high gain and low gain ripple are proposed to satisfy the requirement of a dwdm system

    基於考慮自發輻射噪聲（ ase ）的giles模型，建浙江大學博士學位論文立了這種edfa的全光增益箱制理論模型;理論和實驗分析了四種可能的光路結構、泵浦波長、光纖光柵反射波長和反射率、泵浦功率以及摻餌光纖長度等參t對其箱制特性的影響。
  14. The influence of the configuration, the pump wavelength, the bragg wavelength, the reflectivity, the pump power and the length of edf to the gain - clamped characteristics is studied. an optimal l - band gain - clamped edfa configuration with appropriate parameters of the amplifier, which can also provide a flat - gain band, are given

    總之，本論文圍繞光纖通信領域的國際熱點問題，從理論和實驗上研究了高增益、低噪聲、譜平坦的摻餌光纖放大器的實現，關于edfa的特性的研究成果，我們相信能對科研生產起一定的指導作用。
  15. Secondly, based on the theoretical investigations, a coaxial bwo is designed which operates in the frequency regime of l - band. and its interaction process is analyzed

    其次，利用線性理論分析結果，我們給出了一個l波段同軸相對論返波振蕩器的物理模型，並從理論上分析了其束波相互作用的物理過程。
  16. In this paper, a pll frequency synthesizer working in l band is researched. at fist, we review the basic of phase lock loop and it ' s constituent part. after that the basic conception and design method of pll frequency synthesizer was introduced, especially introduced the charge pump pll frequency synthesizer in detail

    本文是採用鎖相原理設計的l波段頻率合成器，首先對鎖相環路的工作原理和基本組成部分進行了簡單的介紹，然後介紹了鎖相頻率合成器的原理和設計方法，主要介紹了目前小型頻率合成器產品中使用最廣泛的由電荷泵數字鑒頻鑒相器和無源環路濾波器構成的頻率合成器。
  17. Experimental investigation of a compact l - band magnetically insulated transmission line oscillator

    波段磁絕緣線振蕩器的實驗研究
  18. The third, some groping researches are made on broadband coaxial line filter output circuit of klystron. a broadband output circuit - mode four coupling slots double - gap output cavity loaded with coaxial filter, which has a workable relative bandwidth bigger than 14 % and fits in with l - band multi - beam klystron, is designed. meanwhile some analysis of its stability and peak power capacity is made

    第三，對速調管同軸線濾波器寬帶輸出迴路進行研究和探索，設計出了一個適合用於l波段多注速調管、相對帶寬超過14的四耦合槽模強耦合雙間隙腔加載同軸線濾波器輸出迴路，並對其穩定性和峰值功率容限做了一些分析。
  19. The comparison between the results of calculation and measurement shows that the two results are in good agreement for the broad band antenna in the l band and the waveguide - coax converter of bj48 type used as antenna in the c band, with a difference of less than 0. 7db, and that the two results also agrees well in the x band for the waveguide - coax converter of bj100 type used as antenna, with an error close to 1db only at few points in the given frequency range

    比對結果表明: l波段（加脊天線） 、 c波段（ bj48型波導同軸轉換作為接收喇叭）的模擬結果與實測結果符合得較好，誤差小於0 . 7db ;在帶內， x波段（ bj100型波導同軸轉換作為接收喇叭）的模擬結果與實測結果比較一致，只在個別頻率點處誤差近1db 。
  20. It is thus of importance to develop an l - band edfa. however, a conventional l - band edfa is relatively inefficient and has low gain and high noise figure since they are operated at the tail of the erbium gain band. therefore, it is very important to design and analyze a high performance l - band edfa with simultaneously high gain, low noise and low gain ripple for a dwdm system

    開發新的l - bandedfa是十分必要的，然而傳統的l - bandedfa由於工作在鉺光纖增益譜的尾部，其存在增益低、工作轉換效率低、噪聲大等缺點，因此，分析和設計符合dwdm系統發展要求的具有優良性能（高增益、低噪聲、動態增益均衡）的l - bandedfa是十分有意義的。
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