角頻譜 的英文怎麼說

中文拼音 [jiǎobīnpǔ]
角頻譜 英文
angular spectrum
  • 角 : 角Ⅰ名詞1 （牛、羊、 鹿等頭上長出的堅硬的東西） horn 2 （古時軍中吹的樂器） bugle; horn 3 （形狀像...
  • 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...
  • 譜 : Ⅰ名詞[書面語]1 （按類別或系統編成的書或冊子等） table; chart; register 2 （指導練習的格式或圖形）...
  • 頻譜 : frequency spectrum; frequency content; spectrum; power density spectrum; power spectrum; [系統] s...
  1. In the terms of interpolation, the image reconstructed from nearest interpolation or linear interpolation has good edge but serious noise ; reconstruction from 4 * 4cubic interpolation or three b - spline or three - order lagrange interpolations has better local character. 2 x 2cubic interpolations which has both better edge and local character is the ideal interpolation, the following is the basic principle during reconstruction : ( 1 ) the more width of interpolation, the more number of summation and the more order of interpolation polynomial, the higher of density resolution ; ( 2 ) the more of interpolation polynomial and width of interpolation, the more of reconstruction time simultaneously, aimed at eliminating the effects of noise contained in projection data, in this paper, author analysis cause and effects of common artifacts. importantly, discusses convolution back - projection reconstruction algorithm with a shift axis of rotation has been derived for correcting images that acquired with a divergence axis of rotation using the fan beam geometry with an angle - equaled detector

    在ct圖像重建時，選擇有限帶寬窗有較好的空間解析度，三角形窗有較好的密度解析度，選擇餘弦窗則使得空間解析度與密度解析度的折衷；從窗函數的頻譜角度來講，可以用於圖像重建的一個良好的卷積窗函數應該具備以下條件： （ ? ）小的3db帶寬b ，即最小的主瓣寬度； （ ? ）最小的旁瓣最大峰值a ； （ ? ）最大的旁瓣峰值衰減速度d ；就內插函數而言，臨近點內插與線性內插重建圖像噪聲大，但有較好的邊緣與細節； 4 4三次內插、三次b -樣條與四次拉格朗日多項式內插圖像平滑，局部特性較好。
  2. The characteristics of each rainbow for an inhomogeneous particle are studied here using lorenz - mie theory. the relation of the positions of airy peaks to each order rainbow with the profile of refractive index is simulated and discussed, which is compared with the results simulated by ray tracing theory

    本文還利用lorenz mie理論分析了非均勻球粒子各階彩虹的強度和頻譜分佈特點，利用ifft方法重建了各階彩虹的強度分佈；分析研究了各階彩虹的airy峰角位置與折射率分佈的關系，並與非均勻粒子射線追跡理論的模擬結果進行比較。
  3. This article analyses the signal characteristics of several typical cw radars, and presents the principle and application of doppler radar. as one focal point, this article researches the generation and math characteristics of pseudorandom code modulated signal, analyses the spectrum of pseudorandom code phase modulation radar signal, and presents this kind of signal ' s application in distance and speed measurement. this article also researches the application of mono - pulse amplitude comparison radar in angle measurement finally, this article elaborates the working process of crs in uast

    本文分析了幾種典型的連續波雷達信號的特性，介紹了多普勒雷達的原理和應用；研究了偽隨機編碼信號的產生和數學特徵，著重分析了偽碼調相連續波雷達信號的頻譜，及其在雷達測距、測速方面的應用；研究了單脈沖幅度比較體制在雷達測角中的應用；最後，闡述了超近反導系統中復合體制雷達的工作過程。
  4. This article describes a way of special ultrasonic system which monitors thermal stress in seamless welded rails. this monitoring system is a non destructive testing system, which adopts avr mcu and high - precise time chip processing as the core of it, and adopts the critically refracted longitudinal wave as the object of measuring. my studying focuses on the theory of the monitoring system, which will be listed in this arctile : according to the snell theory, the theory of motivating of critically refracted longitudinal wave is described in details, and the finite element software is used to emulate the propagating course. the formulas of calculating the pts of swr are taken from the acoustoelasticity theory, and the calculating the parameters is introduced. according to assemble materials, three kinds of ways of monitoring the pts of swr using critically refracted longitudinal wave are described, which are measuring the sound - time in changeless distance, ultrasonic critical - angle refractomery and frequency spectrum, the first way of ways is used in this experiment system. the factors, which effect the monitoring system, are assaid in some degree based

    本文的研究工作重點在無縫焊接鋼軌溫度應力測量系統的理論模塊，包括根據snell原理，研究極限折射縱波的激發機理，並使用有限元軟體ansys進行模擬;根據聲彈性理論以及公式推導出計算無縫焊接鋼軌中的溫度應力的公式，並對其中參數的求解方法進行介紹;根據收集的資料，介紹了三種使用極限折射縱波測量無縫焊接鋼軌溫度應力的方法，即固定距離測量聲時法、臨界角折射法和頻譜分析法，本實驗系統使用的是第一種;根據實驗經驗以及相關資料，分析了影響極限折射縱波測量溫度應力的幾個因素，並提出了相應的解決方法;根據實驗系統的需要，獨立設計並加工出相關配套的實驗設備，包括實驗鋼塊、有機玻璃楔塊、固定件、載荷外框裝置等。
  5. Random process theory is a kind of effective mathematical tool to handle random vibration problem. through frequency spectra and time domain analysis for random course, the seemed complex vibration time - history can be transferred to trigonometric function series, thus makes it have certain periodic feature

    隨機過程是處理隨機振動問題的一種有效的數學工具，通過對隨機過程進行時域分析和頻譜分析，可以將看似非常復雜和毫無規律的隨機振動表示為三角函數的級數形式，從而使其具備了一定的周期性特徵。
  6. In the analysis of the frequent spectrum and the reflection coefficients, based on goda ' s two - points method which fit to the normal incident wave, a modified two - points method is derived that can be used to calculate the frequent spectrum and reflection coefficient of the oblique waves from which the frequent spectra of incident waves and reflected waves incoming in arbitrary angular, the bulk reflection coefficient and the frequent spectrum of reflection coefficient could be computed, also from which in theory the waves could be measured in two wave gauges which is disposed at any direction

    為了分析單向不規則波入射波的頻率譜和反射系數，本文在goda用於分析正向不規則波的兩點法的基礎上，提出了可用於斜向不規則波頻譜分離及其反射系數計算的改進兩點法，該方法可用於計算任意波浪入射角的入、反射波譜、總體反射系數和反射系數的頻率譜，並且測量波浪過程的兩浪高儀可在較廣的方向范圍內布置。
  7. This paper include the following parts. firstly the sine exciting - voltage is guaranteed by direct digital synthesize technology ; secondly the digital output of cos ( 9 ) and sin ( 9 ) are generated by microcontroller ; thirdly the two voltage signals which are the product of the two former signals gained by the multiplying d / a converter, being filtered and amplified, have constant frequency, and one amplitude has sine function relationship of with the input angle, and the other amplitude has cosine function relationship of with the input angle ; finally the two signals are acquired and analyzed by relative instrument and software

    主要由以下幾部分組成：用數字頻率合成技術（ dds ）產生正弦激勵電壓信號u _ msin （ t ） ；用單片機產生幅度的數字量輸出sin （ ）和cos （ ） ；用乘法型d a轉換器實現激勵電壓和幅度的乘積，並通過濾波器和功放后即得到頻率固定，幅值隨輸入角成正餘弦變化的電壓信號；最後用數據採集卡採集輸出信號，顯示波形並進行頻譜分析。
  8. In this paper the main work includes the analysis of the rotation of special angles, the range of rotation angles in cordic algorithm ; analysis on what condition should be fulfilled to reach any target angle ; analysis and simulation on error band and output spectrum ; imple - mentation of the architecture on fpga device

    我所做的只是很小一部分，主要包括對cordic演算法中特殊角的旋轉和旋轉角度范圍;在何種條件下可以達到任意角度的分析;對許多問題比如誤差上限和輸出頻譜的計算機模擬;這種結構在fpga器件上的實現。
  9. Code division multiple access ( cdma ) communications systems being possessed of the merits of great capacity and soft hand - off and so on must have taken a significant role in future wireless communications systems. because pn sequences used in communications systems are been vertical completely, when numbers of user are more, there are multiple access interference ( mai ) in cdma and serving quality in communications systems is reduced

    碼分多址（ cdma ）通信系統以頻譜利用率高、系統容量大、頻率管理容易，軟切換、移動臺發射功率低、通道的傳輸速率高等優點代表了新一代移動通信，在未來的無線通信系統中必將扮演極為重要的角色。
  10. Lastly, aiming at the poor results which all current algorithms do for directional textures, and cannot synthesis texture directly, aiming at the particularity of this kind of textures, we bring forward the conceptions of non frontal parallel textures and frontal parallel textures. by analyzing texture ' s direction through fourier spectrum, we introduce the conception of main direction, and solve the approximation value of texture ' s main direction by discrete approximated approach. by this way, we can synthesis indirectly simple structural non frontal parallel textures

    最後針對現有演算法對帶有方向的紋理合成效果差，無法直接合成紋理圖像的難點，本論文首先提出了非正平行紋理與正平行紋理的概念，分析了它們之間的內在聯系，引入了兩個角度參數來描述紋理的朝向，採用傅立葉頻譜法分析紋理的方向特性，並提出了紋理主方向的概念，本論文引入離散逼近的方法來求解出紋理主方向的近似值，這樣我們就能用一種間接的方法合成簡單的結構性非正平行紋理。
  11. A voltage signal tria ( tt / pw ) added by normal noise. is demonstrated for 2 - d dependence of the waveform on time and trials and 2 - d dependence of spectrum on frequency and trials to show different time domain and frequency domain properties of a random process including noise and signal

    以加上準常態雜訊之三角波電壓訊號為例，圖示含有雜訊電壓訊號其波形隨時間及試驗之二維變動及頻譜隨頻率及試驗之二維變動，顯示雜訊與訊號之隨機過程在時域與頻域之不同特性。
  12. A voltage signal tria ( tt / pw ) added by zero mean uniform noise. is demonstrated for 2 - d dependence of the waveform on time and trials and 2 - d dependence of spectrum on frequency and trials to show different time domain and frequency domain properties of a random process including noise and signal

    以加上均勻雜訊之三角波電壓訊號為例，圖示含有雜訊電壓訊號其波形隨時間及試驗之二維變動及頻譜隨頻率及試驗之二維變動，顯示雜訊與訊號之隨機過程在時域與頻域之不同特性。
  13. A modulated signal of tria ( tt / pw ) added by a normal noise. is demonstrated for 2 - d dependence of the waveform on time and trials and 2 - d dependence of spectrum on frequency and trials to show different time domain and frequency domain properties of a random process including noise and signal

    以三角波電壓訊號加上準常態雜訊乘以無雜訊載波之調變訊號為例，圖示含有雜訊電壓訊號其波形隨時間及試驗之二維變動及頻譜隨頻率及試驗之二維變動，顯示雜訊與訊號之隨機過程在時域與頻域之不同特性。
  14. Awg possesses an essential function of coherence system - " composing frequency and generating image ". therefore as far as spatial frequency field is concerned, awg is an optical integration of coherent system : two slab waveguides similar to two fourier lenses of one dimension and twice fourier transform of optical signals are realized. here the arrayed waveguide region is frequency spectrum region

    Awg具有相干系統的「分頻成譜、合頻成像」這一本質功能，因此若從空間頻域的角度來看， awg就是一個相干系統的光學集成：兩個平板波導類似兩個一維傅里葉透鏡，實現光信號的兩次傅里葉變換；而陣列波導區即為頻譜區。
  15. Moreover, we put forward many schemes to erase errors such as static error, dynamic error, or make them little. especially we dicuss how to deal with the phase - shifting cell ( pzt ) and interferogram. in the end we bring forward two methods to estimate the contour of piano : one is traditional parameter, the other is power spectral density ( psd )

    提出從兩方面對面形進行評價，一是用傳統光學像質評價指標，二是利用psd從頻譜角度評價面形，從而為高精度檢測和控制大口徑光學元件表面面形（波前）提供了依據。
  16. Firstly, a relevant algorithm is presented for locating single - line - to - ground ( slg ) fault in distribution networks, fault functions are reasoned out and analyzed for single - phase and three - phase distribution lines, and criterion measure, which are based on the frequency, phase and shape characteristics of the fault function spectrums, are also presented for locating slg faults

    首先論文對三相均勻換位線路的故障定位進行了公式推導和數值計算分析，並在頻域內對故障函數的頻譜曲線幅值、相角和頻率特性進行了分析，提出了相應的故障定位判據。
  17. The design principle is introduced and a solution, called cs code, is obtained by the use of two operations to the conventional orthogonal code set ; an operation of cyclic repetition and an operation of angle rotation

    文章介紹了這種碼的設計準則，並給出了一個具體的實例，稱為梳狀頻譜cs碼。 cs碼利用傳統的正交碼通過2步操作得到： 1循環重復操作2角度旋轉操作。
  18. Optical code multiple access ( ocdma ) communication system is a spectral spreading system. all users in the system share all the bandwidth in the same time. because of the using of the almost infinitude bandwidth in the fiber, ocdma system will become more and more important in future ultra - high speed lan and online computer communication system

    光碼分多址（ ocdma ）通信系統，作為一種擴展頻譜系統，用戶同時共享所有帶寬，因為可以充分利用光纖中的巨大帶寬資源，因此在未來超高速局域網和實時計算機通信系統中將扮演重要角色。
  19. Based on frequency - spectrum - transformation, this algorithm first changes acceleration spectrum into displacement spectrum, then calculates its amplitude, angular frequency and initial angle related to every displacement spectrum, finally sums up all the displacement components and forms the time course of the measured vibration

    該方法採用頻譜轉換法，首先將加速度譜轉換成位移譜，再計算出位移譜中每個頻率分量對應的幅值、圓頻率和初相角，最後對各位移分量進行疊加得到振動位移的時間歷程。
  20. 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。
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