頻差波長 的英文怎麼說

中文拼音 [bīnchābōzhǎng]
頻差波長 英文
beat wavelength
  • 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...
  • 差 : 差Ⅰ名詞1 （不相同; 不相合） difference; dissimilarity 2 （差錯） mistake 3 [數學] （差數） differ...
  • 波 : Ⅰ名詞1 （波浪） wave 2 [物理學] （振動傳播的過程） wave 3 （意外變化） an unexpected turn of even...
  • 長 : 長Ⅰ形容詞1 （年紀較大） older; elder; senior 2 （排行最大） eldest; oldest Ⅱ名詞（領導人） chief;...
  • 波長 : [物理學] wavelength波長標準 [光學] wavelength standards; 波長測量 wavelength measurement; 波長常...
  1. The short - baseline interferometer ’ s angle measurement accuracy is influenced by phase difference measuring accuracy, the base length measuring accuracy, the system operating wavelength ( frequency ) and so on, the article analyzes the existing theory, and emphatically analyzes the influence of base length measuring accuracy to the precision of angle measurement

    短基線干涉儀測角精度受相位差測量精度、基線長度測量精度、系統工作波長（頻率）測量精度等因素的影響，文中，在對原有理論進行分析的基礎上著重分析了基線長度測量精度對系統角度測量精度的影響。
  2. At last the algorithm of ddmf is achieved by the investigation tool of altera company ? quartus ii and the vhdl language, and its ip core is also achieved which is used not only in the satellite navigation position system, but also in the long pn code dsss system. ddmf investigated in the dissertation gives a good way to design the rapid pn code acquisition in the beidou project, and the technology has the definite theory and practice significance

    此外還應用altera公司的最新的fpga開發工具quartusiiv5 . 1 ，採用了國際標準的硬體描述語言? vhdl語言，對數字差動匹配濾波器和傳統匹配濾波器演算法予以實現，開發了該演算法的軟ip核，可以對所應用的擴頻碼長度， a / d采樣后的數據量化階數，所用擴頻碼等可進行隨意改寫。
  3. Secondly, ground on the duct noise control, the delayed - lms algorithm, which is actulized easily, is brought forward, then the simulation on pc is achieved. it is shown from the computer simulation that for the single frequency noise, there will be a good effect when choosing the suitable parameters ; but for the narrowband noise, the effect will become worse with increasement of the bandwidth. this result is helpful to analyze the parameters influencing anc

    結果表明： （ 1 ）隨著濾波器長度的增大，系統收斂速度變快； （ 2 ）隨著值的增大，系統的收斂速度增大，但是當值超過某一范圍時會引起系統的發散； （ 3 ）次級通路的延遲數與初級噪聲頻率有關； （ 4 ）對于窄帶信號， dlms演算法可以取得一定的降噪量，但是隨著窄帶信號帶寬的增大，降噪效果明顯變差。
  4. Based on x - filtered lms algorithm and - filtered lms algorithm adaptive inverse control, we use a new variable step size lms algorithm. adding little computation, variable step size lms algorithm can result in fast convergence speed and low residual error simultaneously. the adaptive feedback control can counteract the beginning error of the system

    在原來的x -濾波lms演算法自適應逆控制和-濾波lms演算法自適應逆控制方法的基礎上，引入了新的變步長lms演算法，在計算量增加不多的前提下，能同時獲得較快的收斂速度和較小的穩態誤差；引入自適應的反饋補償控制克服了被控系統的直流零頻漂移，使控制系統在初開始工作階段快速收斂；還引入自適應擾動消除器，它能最大限度的消除擾動。
  5. This system is realized by cpld which can get rid of the disadvantages in one - time design including property liable to jamming, long sampling period, and poor working stability. its sampling period is up to 500ns at least and output delay is only 19. 5ns. a stable period of pulse coming out of quadruple - frequency differential circle belongs to it

    完成了用vhdl硬體描述語言對全數字轉速位置測量子系統的設計，並用max ? plusii軟體進行了編譯和波形模擬，在cpld （ max7000 ）得到實現，該系統克服以往設計中存在的易受干擾、工作穩定性差、采樣周期太長等的缺點，輸出延時僅為19 . 5ns ，采樣最低周期可達到500ns ，且四倍頻微分電路獲得的脈沖周期穩定。
  6. On the basis of previous work, we developed a new data processing system by use of dsp & oop. the new system overcame the problems existed in the old data processing system successfully, such as the bug which cause program dead loop when the data is too long, and the frequency leak due to principle limit of fft filter. in addition, we eliminated the measurement error brought on by phase warp

    我們在前人的工作基礎上，利用現代數字信號處理技術和面向對象的軟體開發技術，統一了彈上黑匣子數據處理系統的操作平臺，完善了轉速、掃描角測試數據處理系統，修正了原有處理程序中的因數據長度過長而導致程序死鎖的bug ；利用有限沖擊響應（ fir ）濾波器，在濾去噪聲的同時，有效地解決了矩形窗fft濾波的頻譜泄漏問題；另外還解決了因相位偏差而導致的測試誤差。
  7. First, the difference equation, numerical stability condition, boundary condition, power sources settings and some improved speedup techniques of the finite - difference time - domain yee computational method were introduced briefly in which with the multi - time step method and the frequency - dependent finite - difference time - domain ( ( fd ) 2td ) method emphasized

    首先，本文簡單介紹了建立電磁模型中所需採用的時域有限差分yee演算法的差分方程、穩定性條件、邊界條件、激勵波源設置等的基本原理和一些用於加速fdtd演算法的改進方法。其中，詳述了多時間步長（ mts ）方法和頻率相關時域有限差分（ （ fd ） ~ 2td ）方法。
  8. These researches provide us a basis for forecasting the pests in grain in earlier stage, accurately utilizing pesticides, improving the efficiency of prevention and reducing the loss of stored grain. the sound absorption properties of various types and thickness of grain are measured by means of the standing wave tube technique. the following conclusions can be drawn : for the same thickness the larger grains has a smaller sound absorption coefficient than the smaller grains

    為了有效地研究儲糧害蟲所產生聲信號在各種糧食中的傳播特性，本文採用駐波管法，對十一種不同種類糧食在不同堆積厚度情況下的吸聲性能進行了實驗研究，糧食吸聲特性與其顆粒的大小、形狀、排列方式及糧食堆積厚度等有關，存在一定的規律，得出如下結論：同一厚度下，顆粒大的糧食較顆粒小的吸聲性能差，顆粒由大到小，吸聲系數峰值頻率向低頻方向移動；球形顆粒糧食較長形顆粒吸聲性能差。
  9. By using wavelet and bandpass filter methods, the different characters of low frequency oscillation ( lfo ) of olr and wind field for eight anomalous flood / drought years in middle and low reaches of yangtze rivers during may - august are investigated

    應用小波變換與帶通濾波等方法分析了80年代以來長江中下游地區夏季8個典型旱澇年份的olr場、風場的低頻特徵及旱澇年位勢高度場的差異。
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