頻帶擴展法 的英文怎麼說

中文拼音 [bīndàikuòzhǎnfǎ]
頻帶擴展法 英文
frequency range expanding method
  • 頻 : Ⅰ形容詞（次數多） frequent Ⅱ副詞（屢次） frequently; repeatedly Ⅲ名詞1 [物理學] （物體每秒鐘振動...
  • 擴 : 動詞（擴大） expand; enlarge; extend
  • 法 : Ⅰ名詞1 （由國家制定或認可的行為規則的總稱） law 2 （方法; 方式） way; method; mode; means 3 （標...
  1. According to the guidline, two nd : yag lasers have been designed and set up, one is end - pumped by lower output power ld using a selfoc micro lens, and the other is end - pumped by high output power ld using a pair of lenses are designed, and the characteristics such as output power and power stabilization of both solid - state lasers are investigated. thirdly, when an empty liquid crystal cell is inserted in the cavity of the nd : yag laser pumped by high power ld, the laser can operates in single axial mode. finally, according to the relationship between the laser output power and the longnitudinal a ld - end - pumped nd : yag laser sensor for displacement measurement has been investigated theoretically and demonstrated experimently, the results indicate that when the mean radius of pumping inside the laser cavity is far less than that of the oscilating laser mode, the exponential of the output power is a gauss function of the longitudinal positon of focused spot of ld pumping beam, both the measurement range and the sensitivity are dependent on the incident pumping power, as the incident pumping power is increased, the measurement range is enlarged and the sensitivity is improve d

    本文首先介紹了ld泵浦nd ： yag激光器的發展狀況、主要特性及其應用，從四能級速率方程出發，推導了ld泵浦nd ： yag激光器的閾值、輸出功率和斜效率的表達式，並簡述了激光器的工作原理、結構型式和倍頻方法；其次，以空間相關的速率方程為基礎，提出了ld端面泵浦nd ： yag激光器的設計方法，給出了一定泵浦耦合方式下，振蕩光模尺寸、最佳輸出耦合率、泵浦光模尺寸、泵浦光焦斑位置等參數的選取依據，以此為依據，設計了自聚焦透鏡耦合小功率ld泵浦nd ： yag激光器和透鏡組耦合高功率ld泵浦nd ： yag激光器，對激光器的輸出功率和功率穩定性等特性進行了實驗研究；再次，在帶尾纖輸出的高功率ld泵浦nd ： yag激光腔內插入一隻空液晶盒，觀察到了激光器以單縱模運轉；最後，根據泵浦光焦斑端面位置對激光輸出功率的影響規律，提出了ld端面泵浦nd ： yag激光位移傳感新方法，並進行了理論和實驗研究，研究結果表明：當激光晶體內泵浦光平均光斑半徑遠小於振西安理工大學碩士學位論文蕩光束腰半徑時，激光輸出功率的自然指數與泵浦光焦斑的縱向位置成高斯變化規律，測量范圍和靈敏度依賴于泵浦功率，隨著泵浦功率的增加，測量范圍擴大，靈敏度提高，當端面泵浦功率為7 . 24w （最大輸出功率為1 . 926w ）時，激光位移傳感器的測量范圍和靈敏度分別是13 . 045mm和0 . 148mw / pm 。
  2. For bowtie antennas, this method can produce a better return loss in the higher frequency band than the original ones, and at the same time, the radiation pattern bandwidths of the new antennas can be broadened more or less

    對蝴蝶結天線而言，應用這種方法得到的蝴蝶結天線在高頻段比原天線具有更好的反射損耗，天線的方向圖帶寬有不同程度的擴展。
  3. With the high accurate transfer function it is possible to design frequency characteristic compensator to eliminate the mechanic resonance frequency characteristic of the control object. the fast steering mirror system closed bandwidth is no longer restricted by the mechanic resonance frequency and the closed bandwidth is expanded effectively

    在獲得對象的高精度傳遞函數以後，使用零極點對消的方法補償系統的機械諧振，有效地擴展了快速控制反射鏡系統的帶寬，使快速控制反射鏡系統的閉環帶寬不再受制於系統的開環諧振頻率。
  4. The frequency band extension with time base jitter is also studied by simulation. the results show that the compensation of time jitter can reduce the error of signal and then increase the accuracy of frequency band extension

    對時基抖動的頻帶展寬技術的模擬結果表明，通過擴展的概率密度法對時基抖動的補償，可以減小信號的誤差，因而提高頻帶展寬的精度。
  5. To extend the results, a total system utility model for avm systems is presented in this thesis. and an extendable, hierarchically distributed solution is also proposed, by which we can figure out optimally the bandwidth, the layer number, and the layer rates for each session

    針對這一問題，本文分析和歸納了自適應視頻組播應用系統整體效能模型，以整體效能最大化為目標，提出了一個可擴展的層次化分佈求解方法，可獲得視頻組播應用系統中各個會話的優化帶寬、優化的分層數量和各層次優化的發送速率。
  6. Thirdly, a modified extended chirp scaling ( ecs ) algorithm is presented, which solves the problem of producding fine focused images in the class of chirp scaling ( cs ) algorithm. lt can be used for uwb - sar imaging effectively. the phas e error produced by cs operation are analyzed. a windowed process in two dimension frequency domain before cs operation are proposed. it can improve the quality of image and widen the effectively swath and increase the peak to sidelobe ratio ( pslr )

    然後針對chirpscaling （ cs ）類演算法不能對參考點精確聚焦的問題，提出了一種改進的擴展cs （ ecs ）演算法，實現了對uwb - sar的高效成像；分析了cs操作產生的相位誤差，提出在cs操作之前在二維頻率域對信號加窗，除有效提高信號的峰值旁瓣比（ pslr ）外，還可以提高圖像質量，增加有效測繪帶寬度。
  7. The main content of this paper : firstly, the basic theory and characteristics of various frequency synthetic technologies and the mixed frequency synthetic technology of dds + pll have been introduced, and the method to expand frequency bandwide has been analyzed and compared

    本文的主要內容:首先介紹了各種頻率合成技術的基本原理和特點，以及dds + pll的混合頻率合成技術，並對擴展頻帶的方法進行了分析和比較。
  8. Based on the analysis of image wavelet transformation and the space / frequency distributing characteristics of different subbands " coefficients, this dissertation fully exploits the following theories and methods : scalar quantization, vector quantization, trellis coded quantization, trellis coded vector quantization, vector classification, codebook expansion and weighted mean square error rule basing mankind visual characteristics, etc. from different angles of information amalgamation, it develops several innovative algorithms of image compression and coding, gives their realization schemes, and makes plentiful simulation tests

    本文在分析了圖像小波變換的原理和子帶系數空間及頻率分佈特點的基礎上，充分利用標量量化、矢量量化、網格編碼量化、網格編碼矢量量化、矢量分類、碼書擴展和基於人眼視覺特性的加權均方誤差準則等思想和方法，從信息融合的不同角度展開了對小波圖像的壓縮編碼研究，同時也討論了這些方法在靜止圖像量化中的具體應用。
  9. In this paper, the control system of rectifying strip steel deviation based on ppf control algorithm is designed, and a way of detecting the deviation signal of strip steel is introduced, which adopted redundancy control that involves capacitance sensor and highfrequency photoelectricity sensor, and improved reliability of the system. the system includes : siemens s7 200 programmabled logic controller, em235 analog signal module expanded, td200 for manipulating and displaying

    本文設計了基於ppf控制演算法的帶鋼糾偏控制系統，並提出採用電容傳感器與高頻光電傳感器冗餘檢測帶鋼偏移信號的方法，增加了系統的可靠性。系統採用siemenss7 - 200plc控制，擴展了em235模擬模塊， td200用於操作及顯示。
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