相位差值法 的英文怎麼說

中文拼音 [xiāngwèichāzhí]
相位差值法 英文
phase-difference method
  • : 相Ⅰ名詞1 (相貌; 外貌) looks; appearance 2 (坐、立等的姿態) bearing; posture 3 [物理學] (相位...
  • : Ⅰ名詞1 (所在或所佔的地方) place; location 2 (職位; 地位) position; post; status 3 (特指皇帝...
  • : 差Ⅰ名詞1 (不相同; 不相合) difference; dissimilarity 2 (差錯) mistake 3 [數學] (差數) differ...
  • : 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...
  • 相位 : phase position; phase
  1. And the explicit finite difference method, the combining method of the central difference method and newmark s constant average acceleration method, and the transmitting boundary are used. by comparing the acceleration determined by the several methods of the displacements or velocities, a computing method of acceleration employed the one side difference of velocity is more practicality in this research. corresponding to normal incidence of the body waves, p waves or svwaves, and rayleigh surface waves, two two - dimensional finite difference programs are compiled to compu te the dynamic response of two - phase media

    以土力學模型為基礎,利用以土骨架和孔隙流體的四個移為基本未知量的數去模擬二維飽水介質中的地震波傳播,採用了顯式分方(中心和newmark常平均加速度結合)和透射邊界,通過比較利用幾種分格式求解的加速度結果,發現一種用速度單邊分求解加速度的方在本文研究中較為實用,分別編制了體波( p波或sv波) 、 rayleigh面波輸入時求解兩介質動力響應的兩個二維數分析程序。
  2. Chapter 3 discusses the modules used in the fh - mpsk and fh - / 4dqpsk systems. these modules include : duc / ddc ( digital up converter / digital down converter ), nyquist flitter, burst start detection, interpolation module, pll ( phase locked loop ), pll error extraction, initial phase correction and the coding and decoding for tcm

    第三章主要討論了跳頻模式下fh - mpsk和fh - 4dqpsk系統中各個模塊的設計,這些模塊包括:上下變頻器、奈奎斯特濾波器、信號到達檢測、插模塊、通用環路、各環路誤提取方、初始校正和tcm編譯碼。
  3. In this paper, the main research works are as follows : 1 ) survey and analysis previous work in auv navigation and summarize : as the cumulate error, the dead - reckoning and inertial navigation systems ca n ' t be used without other modified system ; the acoustic navigation system is used only in small range, and is very expensive. 2 ) two important approaches in geophysical navigation techniques are summarized, one is terrain contour based navigation, this approach is investigated keystone today ; the other is image based navigation, due to no perfect image sensors and image seabed map, this approach has seldom been practised. 3 ) two important terrain contour based navigation algorithms has been applied to auv, one is match algorithm - based terrain contour match ( tercom ) ; the other is kalman filter - based sandia inertia terrain - aided navigation ( sitan )

    主要研究內容包括:一、總結分析了當前水下導航的常用方和不足之處,指出基於航推算的導航方,存在著最大的問題就是導航誤的積累問題,如果沒有修正系統,這種方很難滿足使用要求;其次指出基於聲學的導航方,造價昂貴,導航范圍有限,難以滿足自主水下航行器大范圍導航的需求;二、總結了當前水下地形輔助導航的主要技術路線,一是基於地形高程的匹配方,這是當前研究的重點;二是基於地形圖像的匹配方,由於缺乏良好的圖像傳感器,和可用的海底圖像地圖,目前這種方還有待研究發展;三、將兩種地形高程匹配的常用方應用到自主水下航行器上:以關演算為前提的地形輪廓匹配( tercom )方和以卡爾曼濾波為基礎的桑迪亞慣性地形輔助導航( sitan )方,前者演算簡單可靠,但是導航精度不高,後者雖然精度比較高,但存在著演算較為復雜、有可能發散和出現奇異等問題。
  4. At first, the paper confirms singular area by singular detection, then designs a series of low - pass filters that have different templates according to the different position in finger image for a local area, at last sets up gabor filter parameters according to the characteristics of fingerprint image. the improved enhancement algorithm has a better robust, and can preserve texture structure of singular area effectively. in binary noise clearance, the paper presents an algorithm that clears the biggish white speckles and black speckles

    在指紋圖像增強方面,本文針對傳統的基於gabor濾波器指紋圖像增強演算魯棒性以及通常會改變奇異區紋理結構的缺點,對原有演算進行了一些改進:首先通過檢測奇異點確定奇異區,然後根據局部區域在指紋圖像中的置構建應取方式的低通濾波器並對該局部區域方向圖進行濾波,最後根據指紋圖像紋線的特點對gabor濾波器參數進行設置。
  5. Study shows that the basic principles of three existed methods for phase difference correction on discrete spectrum are identical, by which the twice fft analysis through time - domain shifting time series or changing window ' s length is performed, and the spectrum by making use of the phase difference of two corresponding peak lines are finally corrected

    在研究時域平移的離散頻譜校正方和改變窗長離散頻譜校正方的基礎上,發現這幾種離散頻譜校正的基本原理是一致的,就是通過時移和加不同的對稱窗進行兩次fft分析,並利用離散頻譜對應峰譜線的以求得頻率和校正量。
  6. According to the present status of studying the solar flare using gps, a new algorithm of processing gps data studying the solar flare is brought forward : after the instrumental bias has been determined, with the data of dual - frequency gps code and phase and navigation message, the vtec at the satellite ' s epp can be worked out

    根據現在研究太陽耀斑的實際情況,提出了利用gps研究太陽耀斑的數據處理方:利用雙頻觀測確定出儀器偏后,再利用碼和觀測,結合導航電文就可以求出電離層交叉點的沿天頂方向上的電子總量vtec
  7. This paper analyzes detailedly the principles on distributed busbar protection - current instantaneous value differential method, impedance method, and put forward the new method of current fault component phase method, then compares with these methods

    本文詳細分析了分散式母線保護中的原理?瞬時電流、阻抗,提出了電流故障分量的新方,將這幾種方進行比較。
  8. The algorithm, basing on convolution filtering technique and the fringes " gray values max - min distribution, can automatically and accurately carry out space frequency spectra shifting without spectra analysis and spectrogram in the technique of phase method of projected grating for 3 - d object shapes measurement. the new algorithm makes image processing much caster and the technique of object shapes measurement more automated. the phase error caused by filtering and the crossed - optical - axes geometry setup is also discussed

    本文採用投影光棚和數字卷積濾波技術:根據柵線的條紋灰度分佈具有極大極小分佈的特性,提出卷積濾波形貌光學自動檢測的圖像處理方,有效地實現了頻譜自動移,從而進一步提高了圖像處理的速度和形貌測量技術的自動化程度;同時對採用兩光學主軸交,且非遠心投影系統所產生的誤進行了分析,並提出了修正方
  9. The performance of the pbg antenna using the new pbg cover together with a pbg substrate is studied by the fdtd method together with the pml boundary treatment. the numerical results show that a more focused beam radiated in the broadside direction is achieved. the gain of the pbg patch antenna in the forward direction is improved by about 6 db. the radiation directivity is improved significantly and reaches 11. 5 db, which is 0. 4 db less than the maximum value that is allowed physically for this size of the antenna ( this difference is about 4. 1 db less than the difference achieved by thevenot et al.,

    用fdtd方並結合pml吸收邊界條件,我們對加了這種新的覆層結構並且基底鉆孔的復合結構電磁(光子)晶體貼片天線的性能進行了研究,結果證明加了這種新的電磁晶體覆層結構以後,天線的波束收攏很多,並且向前輻射的增益大大提高,與普通天線比,天線的e面和h面方向圖上向前輻射的增益均提高了約6db ,另外,該復合結構天線的方向性系數達到了11 . 5浙江大學博士學論文db ,與該物理尺寸天線的方向性系數的理論極限( 11 . 9db )0 . 4db ,該比thevenot等人設計的電磁晶體覆層天線的減少了約4 . 1db ,比qiu等人設計的電磁晶體天線的減少了約1
  10. Concerning the problem of the frequency instability, slight but not negligible, in electric power system, this paper discusses the resultant error in measurement in detail and develops an error - correction interpolated algorithm in frequency domain. taking advantage of the high calculating speed of pc, the measurement error in frequency, amplitude, and phase are well eliminated

    本文針對電網頻率輕微但不可忽視的不穩定造成的測量誤問題進行了詳細的討論,形成了一套在頻域實現誤校正的方?插演算,並利用pc機高速的數據處理能力軟體校正了各次諧波的頻率、幅
  11. Calculations indicate that the carrier phase takes effect till the time width of the pulse envelope becomes smaller than the period of the carrier oscillation, and the interpretation of this phenomenon is also presented. it is the difference between phase delay and group delay that causes the sliding between the carrier and the envelope

    分析的結果表明,當脈寬小於光波周期時,的作用開始顯現出來,當脈寬比光波周期長時,載波的作用可以忽略,並分析了起作用的原因,用解析的方說明正是延遲和群延遲之間的別造成了光載波在脈沖包絡下的滑動。
  12. Based on the comprehensive analysis of the application status and the existed problems of transmission line fault location, this dissertation presented a new algorithm for fault location based on two - terminal asynchronous data, which can make correction for the integrate error of line parameter, length of transmission line, sampling value and so on. at the same time, it can work out the two - terminal asynchronous phase angle with the corrected parameters

    本論文在充分分析了國內外故障測距的理論與技術以及存在的問題后,針對輸電線路故障定因線路參數變化對定準確度的影響,提出了能夠對線路的參數、長度和采樣等誤等進行綜合誤修正( cie )的新演算,並利用修正後的參數來求解兩端的不同步
  13. 2. firstly this paper introduce the whole machine balancing principle and method for dual - rotor systems with little rotating speed difference firstly, then discuss key points such as picking up base signal, picking up " pai " signal, measuring rotor speed, capturing the value of wave crest and through, calculating the phase values of unbalanced weight, processing odd phases and finding each rotor ' s amplitude. on the foundation of above theories, using signal process technique and chip microprocessors technique, we developed a portable intellectual instrument, the first domestic device. which can balance dual - rotor system with little rotating speed difference quickly and accurately

    本文從不解拍整機動平衡原理出發,在詳細討論基準信號、拍振信號的提取;轉速的測量;拍峰、拍谷的捕捉:不平衡的求、特殊角的處理;內、外轉子幅的確定等關鍵問題的基礎上,應用信號處理技術和單片機技術研製成功國內第一臺性能穩定、操作簡單、成本低廉且平衡速度快,平衡精度高的便攜式微速雙轉子現場整機智能動平衡儀。
  14. So power systems harmonic analysis is a significant aspect of power systems research. power system harmonic analysis was realized usually with fast fourier transform ( fft ), but the method exits spectrum leakage, and can not analyse all harmonic parameters exactly, such as frequency, amplitude and phase, in particular has big phase error

    電力系統諧波分析通常都是通過快速傅立葉變換( fft )實現的,但是這種方存在柵欄效應和頻譜泄漏,使計算出的諧波參數即頻率、幅不準,尤其是很大,無滿足準確的諧波測量要求。
  15. After the discussion of the numerical simulation method based on the fdtd method and the pml technique, the motions of the charges and the electrical field lines were first employed to describe the radiation procedures of the pulse electromagnetic waves. then the causes of how the charges are accelerated and how the motion status of the charges are maintained were further studied from the angle of interaction of charge and field. after these analyses, it was pointed out that the pulse radiation is due to the suddenly occurred time - varying electrical field ( displacement current ) in the open space. this view was further evidenced by two examples : one is the partly resistance loaded antenna, the other is the partly curved antenna. the radiation procedures of the pulse electromagnetic waves of many different situations were simulated throughout this paper with the contours and waveforms of electric field given. these figures are very helpful to the understanding of the radiation mechanism of the pulse electromagnetic waves

    在討論了基於時域有限和完全匹配層技術的數模擬方之後,首先從運動電荷和電力線的角度直觀地描述了脈沖電磁波的輻射過程,然後進一步從場與電荷互作用的角度分析了天線上電荷是如何被加速以及如何維持其運動狀態的,指出了開放空間中突然出現的時變電場(移電流)是脈沖電磁波輻射的根本原因.文中還對局部電阻加載的天線和局部彎曲的天線進行了研究,以進一步說明上述觀點.對多種情況下的脈沖輻射過程進行了數模擬,並給出了電場的等高線和空間波形圖,這些圖形對理解脈沖電磁波的輻射機理非常有益
  16. The method based on quadrature demodulation is studied and the equations used to calculate the frequency, magnitude and phase ( difference ) of signals are given. the author has designed two kinds of low pass filters ( lpfs ) and has studied two kinds of frequency - tracking methods

    研究基於正交解調的科里奧利質量流量計信號處理方,給出了同時求出信號的頻率、幅)的公式,設計兩種濾波器,研究兩種跟蹤方,並進行模擬和比較,得到較好的方案。
  17. The square detection can picks up the carrier frequencies, which is simple and has great performance. but this method can ’ t recognize the signal as spread spectrum signal. the spectral correlation detection method can estimates the chip rate of signal ’ s pn sequence

    然後,針對異步的cdma信號,採用延遲乘的方檢測用戶數目,同時估計出各用戶信號的幅;該方的缺點是各用戶信號必須有一定的,同時用戶數不能太多。
  18. The claim has been made upon the results that the wmt method should be used in the area near the vertical, while the phase difference method in slant beams and a rule has been given to select among those two methods according to the " effect value " on condition the depth is known for the consideration of improving the measurement precision, this paper studies the factors which affect the toa measurements, and three expressions of precision has been introduced as to applications of phase difference method, this paper introduces an automatic hunting method based on amplitude power to get the range of echo arrival

    採用方分析的方,使用重復海試數據對wmt的優劣進行了分析,指出了垂直附近應該使用wmt,而傾斜波束應該使用;給出了在深度真實已知前提下wmt使用的判決準則,即根據效應的大小來選擇。本文從提高測量精度角度出發,分析並驗證了影響toa測量精度的因素;給出了三種精度表示。在應用時,引入了一種基於幅度能量的區間自動搜索方;實驗表明該方能很好地確定回波到達的大概時間范圍。
  19. 2 - d fourier technique could compute horizontal and vertical speed of cloud motion in the same time, so it can avoid the error caused by 1 - d moving supposition in the 1 - d fourier technique. in this part, the 2 - d fourier technique theory was introduced, and a numerical simulation was given in this paper. in the third part, we compared the 2 - d fourier technique with the 1 - d fourier technique, analyzed their problems and found ways to resolve them

    用二維傅立葉分析導風,同時計算水平和垂直方向的風速,能夠避免一維傅立葉導風中一維平移假設帶來的誤,文中介紹了二維傅立葉導風的基本理論和風速計算方,並給出二維傅立葉導風技術的數實驗。
  20. Broadband source location method is investigated by using signal - phase - matching principle, and simulations and experiments are carried out to show the validity of the method ; two high resolution algorithms of broadband signals are proposed, which are the dft interpolation algorithm and the frequency invariant beam space algorithm. the proposed algorithms have no requirement for prior information of source locations, so the results of doa estimation can be unbiased ; a method of temporal - spatial averaging, which can improve the performance of doa estimation for uniform linear arrays, is given. this method can be applied in the most narrowband or broadband eigen - structure based high resolution algorithms

    提出了利用信號匹配的寬帶信號方估計方並從模擬和實驗兩方面對其進行了驗證;提出了基於dft插的和基於頻率不變響應波束域的兩種寬帶信號高分辨方估計演算,這兩種方在進行方估計時均不需要進行方預估,從而避免了因角度預估可能帶來的估計偏;最後提出了一種提高均勻線列陣方估計性能的時空平均,該方可適用於多數窄帶或寬帶的特徵結構類高分辨方估計演算中。
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