time and frequency distribution 中文意思是什麼

time and frequency distribution 解釋
時間和頻率分配
  • time : n 1 時，時間，時日，歲月。2 時候，時刻；期間；時節，季節；〈常pl 〉時期，年代，時代； 〈the time ...
  • and : n. 1. 附加條件。2. 〈常 pl. 〉附加細節。
  • frequency : n. 1. 屢次，頻仍，頻繁。2. （脈搏等的）次數，出現率；頻度；【物理學】頻率，周率。
  • distribution : n 1 分配，分發，配給；分配裝置[系統]；配給品；配給量；【經濟學】配給方法，配給過程；分紅；【法律...
  1. Second, this paper analyzes the time - frequency distribution of the clutter from airborne pulse doppler radar ( pdr ). the side - lobe clutter, which is the main factor to influence the pdr, is analyzed and calculated. based on the simulation of typical geometry of the land, we analyze and discuss the side - lobe clutter and concluded that the dft of can be considered as the phase of the coho

    並且根據各種典型地貌的近似模擬，從統計特性上和頻率域上對脈沖多卜勒雷達的旁瓣雜波進行了分析討淪，還得出脈沖多卜勒雷達的dft可以近似地看作相參積累，並在程序的編制中利用了這一個結論。
  2. On the basis of investigation and research about the technology of reconstruction for ict image up - to - date, this paper is devoted to develop an algorithm for image reconstruction based on wavelet theory. in this paper, time - frequency distribution for spatially varying filter was used to construct convolve - kernel by dwt, to modify convolve - back - projection algorithm

    本文在國內外有關ct圖像重建的研究狀況基礎上，根據小波分析理論，利用小波變換在時頻空間的可變性，用dwt變換構造卷積核，對卷積反投影演算法做了改進。
  3. The other research purpose is to discover characteristic information and reliable methods of reflecting spinal cord damage. due to typical damage indicators, amplitude and latent period, have bugs such as limited information and weak stabilities, this project recommends applying time - frequency analysis to monitoring spinal cord function. through analysing and comparing typical signal with stft and cwt, it is proved indicators under time - frequency distribution can be better in reflecting signal changes, espcially the wavelet transformation

    針對目前ep監測中判定脊髓損傷的指標（波幅和潛伏期）存在信息量相對較小、穩定性較差的缺陷，本課題提出利用時頻分析技術對術中脊髓功能監護進行研究，通過短時傅立葉變換和小波變換分析和比較典型信號的時頻分佈，證明時頻特徵參數能更有效的提取信號的變化信息。
  4. The signal process function of the software include these function : digital filter, windowing, auto - correlation function and cross - correlation function, mean and variance, probability density function and probability distribution function statistic ; auto - power spectrum, cross - power spectrum, frequency response function, coherence function, cepstrum analysis based on fft ( fast fourier transfer ) ; joint time - frequency analysis based on stft ( short - time fourier transfer )

    軟體的處理功能包括：數字濾波、時域加窗、自相關與互相關處理、均值和方差計算、概率密度和概率分佈函數計算；在快速傅立葉變換（ fft ）基礎上計算自功率譜、互功率譜、頻率響應函數、相干函數、倒頻譜分析；基於短時傅立葉變換（ stft ）的聯合時頻分析等。
  5. First, realized a wegener - willie distribute based network traffic anomaly detection algorithm. we make use of wegener - willie distribute to analyze the inherent time - frequency distribution characteristics of the traffic flow signal. then according to the experience of analysis on historical flow, we construct a normal flow training sample aggregation and a abnormal flow training sample aggregation

    通過魏格納-威利分佈分析網路流量信號在時頻分佈上所反映出的內在特點，根據歷史流量的經驗構造正常流量和異常流量兩個訓練樣本空間，通過k最近鄰分類演算法將帶檢測流量信號的時頻分佈與訓練樣本進行比較，完成對檢測樣本的自動分類識別。
  6. So they can not be used in on - line fault detection and condition monitoring. and the explanation of the time - frequency analysis is not easily accepted by the engineers. the experimental factors, such as rotational speed and measured position and fault distribution a

    文中還針對轉速、測點位置、故障分佈（位置） 、負載等因素對頻譜分析、包絡分析、時延相關解調等方法的診斷效果進行了大量的實驗研究。
  7. A new method is presented. the travel time, including the time delays associated with overland folw pathways, is obtained. it is expected that the hillslope velocity and the stream velocity are different, and different equation is used. in the method, the fact that velocity increases going downstream in river systems is taken into account. after the travel time of each cell being calculated, the frequency distribution of the times of arrival of individual water droplets at the catchment outlet - giuh, is obtained

    提出了一種匯流時間計算方法，匯流時間中包括坡地漫流時間和河道匯流時間。方法中坡地單元的匯流速度與河道單元的匯流速度採用不同的計算公式，同時考慮流速沿河道向下游的變化。流域中每一個網格單元的匯流時間得到后，將其看作隨機變量，進行統計分析后，得到匯流時間的頻率分佈? giuh 。
  8. In the aspect of blind - identification, the mutual power spectrumx time - frequency distribution product of two delay signals are used as the features of classification. the cluster analysis and cumulant invariants of mpsk signals are used to automatically classify communication signals

    在信號識別中，選取信號的互功率譜、時頻分佈、 mpsk信號的延遲相乘信號作為分類特徵，利用模式識別中的聚類分析以及mpsk信號的基於高階累積量構成的分類特徵不變量實現了信號調制類型的自動分類。
  9. To detect transient signals under complex background, a novel method of aliasing - free exponential bilinear time - frequency distribution is presented in this paper, which can avoid the frequency aliasing and information loss existing in the traditional bilinear distributions, reduce the cross - terms effectively and possess high time - frequency resolution

    摘要針對復雜背景條件下瞬時信號的探測，提出一種新的無混疊雙線性時間頻率分佈方法，該方法能夠避免常用的雙線性時頻分佈中的頻率混疊與信息丟失，有效減小交叉項干擾，而且具有較高的時頻解析度。
  10. Lacking of space locality in time domain, fourier analysis can only make certain of the integral singularity of a function or signal. as a result ; it is difficult to detect the spatial position and distribution of broken signal by fourier analysis. wavelet analysis has the characteristic of spatial locality, and its wideness in both windows of the time and the frequency can be adjusted, so it can analyze the details of a signal

    小波分析優于傅里葉之處在於，小波分析在時域和頻域同時具有良好的局部化性質，因為小波函數是緊支集，而三角正、餘弦的區間是無窮區間，所以小波變換可以對高頻成分採用逐漸精細的時域或空間域取代步長，從而可以聚焦到對象的任意細節。
  11. The geomorphological instantaneous unit hydrograph ( giuh ) is viewed as the frequency distribution of the times of arrival of individual water deoplets at the catchment outlet. the travel path, for a typical hillslope cell. consists of a hillslope fraction, corresponding to overland flow and a stream fraction, corresponding to concentrated channeled flow. to obtain the time of travel, velocities must be defined. hillslope and stream velocities vary with location and must be strongly correlated with slope, and therefore a spatial distribution of velocities and hence of travel times could be obtained. the present methods of giuh neglect any time delays associated with overland flow pathways

    地貌單位線被看作是流域上各水質點在弱相互作用下，到達流域出口匯流時間的頻率分佈。對於一個典型的山坡型網格單元，匯流路徑由兩部分組成，即坡地部分和河道部分，為了得到匯流時間，必須首先確定匯流速度。坡地和河道的匯流速度隨著區域位置而變，並且必然與坡度有關，因此，可首先計算流速的空間分佈，進而得到匯流時間的空間分佈。
  12. Lacking of space locality in time domain, fourier analysis can only make certain of the integral singularity of a function or signal. as a result, it is difficult to detect the spatial position and distribution of broken signal by fourier analysis. wavelet analysis has the characteristic of spatial locality, and its wideness in both windows of the time and the frequency can be adjusted, so it can analyze the details of a signal

    經典的fourier變換把信號按三角正、餘弦基展開，將任意函數表示為具有不同頻率的諧波函數的線性迭加，能較好地刻劃信號的頻率特性，但它在時空域上無任何分辨，不能作局部分析，這在理論和應用上都帶來了許多不便。
  13. Meanwhile, the performance of joint estimation of time - delay and frequency using the reduced interference distribution ( rid ) is analyzed comprehensively

    同時還利用減少交叉項分佈（ rid ）實現水下多目標信號的時延-頻率聯合估計。
  14. For multicomponent chirp signals with unbalanced amplitudes, an iterative algorithm combined with the paf is proposed to suppress the error propagation effect and residual signal in the peeling - off procedure. the corresponding time - frequency distribution for unbalanced signals is derived

    針對多分量強弱信號，引入基於逐次減小誤差的迭代演算法，導出了能夠減小強弱信號相互影響的核函數設計方法，從而有效抑制誤差傳播和殘余信號。
  15. By the use of “ radar target backscattering simulation software ” and through many flight mode and research mode experiments with the u. s. - made helicopter ah - 64 as an example, a detailed analysis of helicopter echoes ’ time, frequency domain and time - frequency distribution characteristics is made. finally, according to these features, a tentative plan to detect hovering helicopters is proposed

    本文利用專門的電磁模擬軟體，以美製「阿帕奇」直升機為例，詳細分析了直升機雷達回波的時域、頻域和時頻分佈的特性，並根據這些特點提出了雷達探測武裝懸停直升機的初步方案。
  16. Aiming to solve this problem, the work of the thesis is shown below : 1. the product ambiguity function ( paf ) - based adaptive time - frequency distribution is proposed. in specific, two adaptive methods for kernel design, the radon - paf based method and the paf - lag - varying filter based method, are presented

    本文針對這一問題開展了如下工作: 1 .提出了基於乘積性模糊函數的自適應時頻分佈，並給出了兩種針對線性調頻信號的自適應核函數設計方法，包括基於radon - paf濾波和基於paf時變濾波的方法，使得該時頻分佈能夠在增強時頻聚集性的同時抑制交叉項。
  17. Joint time - frequency analysis technology is proposed in focusing imaging instead of traditional range - doppler method. it could apparently improve the image quality. time - frequency resolution and cross term interference of some kinds of typical time - frequency distribution are analyzed in the dissertation

    分析比較了幾種典型的時頻分佈的時頻解析度和交叉項干擾問題，並通過模擬證明了時頻綜合方法和重排理論能得到更優的isar圖像。
  18. 2. discuss the discrete form of time - frequency analysis ; give the simulations of wigner - ville distribution and short time fourier transform under different snr. at same time, to overcome the cross - term of wvd, choi - williams distribution and b - distribution are introduced

    以wvd為研究重點，對時頻分析的概念、性質做系統的介紹；給出常用的時頻分析形式，例如短時傅立葉變換、 wigner ? ville分佈；最後給出時頻分析的一般定義。
  19. Description of some of the expected future developments in time and frequency standards and distribution, including such topics as chip - scale atomic clocks ( size of a rice grain, powered by aa battery, potentially capable of low cost mass production )

    介紹一些未來可預期的時間頻率標準和發布技術的進展，包括諸如「晶元級的原子鐘」 （大米粒尺寸，由aa電池供電，具有低成本大批量生產潛力） 。
  20. Short - time fourier transform and time - frequency distribution series are applied to time - frequency imaging. time - frequency distribution series based on wavelet transform is discussed., and a new time - frequency tool : frequency - shear distribution is introduced into radar imaging fields

    討論了基於小波變換的時頻分佈級數，把一種新的時頻分析工具? ?頻率-切變分佈應用於時頻成像。
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