frequency resolution 中文意思是什麼

frequency resolution 解釋
頻率解析度
  • 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。
  • resolution : n 1 決心，果斷；堅定，剛毅。2 （議會等的）決定，決議（案）；【法律】〈罕用語〉判決；（疑問等的）...
  1. These conclusions are important for choosing suitable radar system parameters such as center frequency, resolution and imaging squint angle in engineering design

    這些結論對工程設計牛選擇合適的工作參數，如載頻、解析度、成像斜角等具有較為重要的參考價值。
  2. By making full use of favourable narrow - band tracing filter character of pll and by combining the merits of dds such as super fine frequency resolution 、 high frequency accuracy 、 very fast frequency hoping with it, the pll / pll + dds frequency synthesizer presents wide band high quality source and super small frequency hoping step. while the electronically tuned filter abates the image interference and notably improves the selectivity. the theorem of frequency synthesizer and center - frequency - fixed filter is simply but adequately introduced first in this paper

    課題中所採用的pll或dds pll鎖相頻率合成方法充分發揮鎖相環良好的窄帶跟蹤濾波特性，並結合dds的高頻率解析度、高頻率精確度和高速頻率捷變等優點，分別實現了系統所要求的高質量寬帶本振源和小步長頻率捷變；採用電調諧選頻技術，則大大改善了接收機的選擇性和抗干擾能力。
  3. In this system two oscillator are used for mixing. pll for high local oscillator and dds + pll for low local oscillator. by making full use of favourable narrow - band tracing filter character of pll and by combining the merits of dds such as super fine frequency resolution, high frequency accuracy, very fast frequency hoping with it, the pll / pll + dds frequency synthesizer presents wide band high quality source and super small frequency hoping step

    系統採用兩次混頻，其中高本振的設計採用pll鎖相環頻率合成來實現，充分發揮了鎖相環頻率合成器的優良特性，實現了系統所要求的高質量寬頻帶本振源；低本振採用pll + dds頻率合成來實現，結合pll優良的鎖相特性與dds的高頻率解析度、高頻率精確度等優點，實現了頻率的小步進高精度合成。
  4. Fluorescence power transfer function, three - dimensional point spread function ( 3d - psf ) and three - dimensional optical transfer function ( sd - otf ) for the various fluorescent wavelength of the two kinds of fluorescence confocal scanning microscopy are calculated in this paper by using fourier imaging theory. the results show that the fluorescent wavelength has influence on imaging property of confocal microscopy such as spatial cut - off frequency, resolution and 3d - otf. there is a different missing - cone in the 3 - d space of otf when the ratio of excitation wavelength to fluorescent wavelength decreases

    本文在sheppard和gumin等人的理論基礎上，利用fourier光學成像理論，討論了不同熒光波長對單光子和雙光子共焦顯微鏡成像特性的影響，導出了單光子和雙光子共焦顯微鏡的熒光功率傳輸函數、三維脈沖響應函數和三維光學傳遞函數，得到了它們在不同激發波長與熒光波長比值時具體的表達式，並且通過數值計算，得到了它們的曲線圖，結果表明：隨著激發波長與熒光波長比值的增加，焦斑的橫向分佈和縱向分佈變窄，橫向解析度和縱向解析度提高，系統的成像效果變好，當激發波長與熒光波長的比值下降到一定程度時，可以看到不同程度的失錐現象。
  5. 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。
  6. The thesis concludes that spectrum scan speed can reach 680mhz / s at 1khz frequency resolution when it has 8192 points complex data

    本文研究指出，譜分析數據量為8192點復數據時， 1khz頻率解析度要求下的掃描速度可達680mhz s以上。
  7. Digital waveform generator which use dds ( direct digital synthesize ) technology has many merits like high frequency resolution, good stability and easy to generate signal

    基於dds技術的數字波形發生器具有頻率解析度高、穩定性好、可靈活產生多種信號的優點。
  8. Uncertainty principle points out that, which means that high time resolution and high frequency resolution can not be obtained both at the same time in spectrum analysis

    測不準原理表明： t ? f 1 / 4 ，即在一次譜分析中，時間解析度和頻率解析度不能同時達到高解析度
  9. It has the advantage of high frequency resolution and low phase noise when compared with traditional integer - n phase locked loop ( npll ) frequency synthesis

    分數分頻（ fnpll ）頻率合成器則是近年來出現的一種新技術，它與傳統的整數分頻頻率合成器相比具有頻率解析度高、相位噪聲低等優點。
  10. Direct digital frequency synthesizer ( dds ) is an apparatus to generate wave on the required frequency. it provides high frequency resolution, rapid frequency transforma - tion and other superiority

    直接數字頻率合成器是現代頻率合成的主要工具，它有頻率解析度高，頻率轉化快等眾多優點。
  11. The agilent technologies 33250a function arbitrary waveform generator uses direct digital - synthesis techniques to create a stable, accurate output on all waveforms, down to 1 hz frequency resolution

    Agilent 33250a函數任意波形發生器使用了直接數字合成技術，可在所有波形上產生頻率解析度達
  12. Through the research of direct digital synthesizer ( dds ) used as a divider in phase lock loop ( pll ), a frequency synthesizer with small frequency resolution ratio and high purity frequency spectrum can be realized

    摘要通過對直接數字合成器在鎖相環路中作為分頻器應用的研究，使頻率合成器可以在實現超細頻率解析度的同時達到高的頻譜純度。
  13. Experimental results indicate that the method here has great improvement on the noise performance and frequency resolution and can detect effectively sinusoidals that have close - spaced frequencies

    模擬實驗表明，本文方法具有較好的噪聲穩定性和較高的頻域分辨能力，能準確地檢測出頻率非常接近的正弦信號，具有較好的估計性能。
  14. Frequency resolution displayed

    頻標解析度
  15. Wavelet package is division of wavelet high - frequency space for increasing resolution. by this means, the shortage of low frequency resolution on die premise of high time resolution can be overcome

    而小波包則是對小波子空間w _ j按照二進制分式進行頻率的細分，以達到提高高頻部解析度的目的
  16. Dds has many advantages such as higher frequency resolution, short frequency changing time, and continuous - phase in frequency changing, etc. since dds is programmable and has a digital architecture, dds is used widely and plays a very important part in software radio system

    直接數字頻率合成具有可編程性和全數字化結構，從而使它在軟體無線電中發揮了重要作用，得到廣泛的應用。但直接數字頻率合成輸出信號雜散較大，這一點限制了它的進一步推廣應用。
  17. Since the energy of 18 - information track signal is concentrated around upper frequency and lower frequency, the frequency of the modulation signal is low, and it must have high resolution, we use zfft to detect it. as the energy of um - 71 signal is more concentrated, we use extreme value method to detect the frequency of modulation signal in frequency domain, which can satisfy the frequency resolution

    針對18信息軌道信號能量集中在上、下邊頻附近且低頻信息頻率低的情況，提出了用zoom - fft （ zoom指頻率擴展或細化，簡稱zfft ）演算法進行信號的局部放大檢測低頻信息，以提高信號的頻率解析度，而um - 71軌道信號能量集中在載頻附近，在頻域上採用極值法檢測低頻信息，即可滿足信號頻率解析度的要求。
  18. But it is not suitable for online implementation or for tracking signal components with characteristic that change with time, a new modified algorithm is present based on the adaptive short - time kernel. simulations show that adaptive short - time kernel time - frequency distribution has better performance than anyother time - frequency distribution not only in the time - frequency resolution but also in the cross - components suppression

    通過對模擬信號計算其自適應短時高斯核時頻分佈，模擬結果表明，無論從改善信號的時頻解析度還是抑制交叉項方面，自適應短時核時頻分佈均表現出了較好的特性。
  19. 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。
  20. The direct digital frequency synthesizer is a kind of fully digitized frequency synthesizer, which consists of the phase accumulator, the sine look - up table, the digital to analog converter and the low band filter. it is of high frequency resolution, fast frequency switching speed, low phase noise, the ability to switch frequencies while maintaining constant phase, and the ability to producing arbitrary waveforms

    直接數字頻率合成器是一種全數字化的頻率合成器，由相位累加器、波形rom 、 d a轉換器和低通濾波器構成， dds技術具有頻率解析度高、頻率切換速度快、頻率切換時相位連續、輸出相位噪聲低和可以產生任意波形等優點。
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