fractional frequency 中文意思是什麼
fractional frequency
解釋
分頻進動- fractional : adj. 1. 零碎的，斷片的。2. 【數學】分數的，小數的，有零數的；不足買賣單位的。3. 【化學】分餾的，分級的。
- 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。
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The fractional fourier transform is linear time - frequency transform, and it doesn ’ t have disadvantages of wigner - ville distribution. moreover, the precision of this method is higher, and the performance of antinoise is better
而分數階傅立葉變換是線性時頻變換，所以它不受交叉項的干擾，沒有不模糊區間減半的缺點，而且它的估計精度高、抗噪性能好。 -
Design of hardware consists of three pll loops, micro wave sample mixer, fractional - n frequency divider
硬體電路包括三個鎖相環，取樣混頻器，分數分頻器的設計等。 -
The designs of the pfd, digital filter ocxo and fractional - n counter in the frequency synthesizer unit are discussed, based on the pll theory. in order to improve the precision of pll, some design methods of pfd are given, and its feasibility is validated by the fpga hardware implement
2 .在鎖相理論指導下，第三章討論了頻率合成器設計中的鑒頻鑒相器、數字濾波器、恆溫壓控振蕩器和分頻電路設計。為了進一步提高頻率合成的精度，文中給出了提高鑒頻鑒相器性能的一些設計思想，結合fpga的硬體設計驗證了其可行性。 -
It has been an important component of communication, radar, instrument, high - speed computer and navigation equipment. fractional - n phase locked loop ( fnpll ) frequency synthesis has been appeared in recent years
頻率合成器是一種相位鎖定裝置，是通訊、雷達、儀器儀表、高速計算機和導航設備中的一個重要組成部分。 -
With the phase - noise model of the phase loked loop ( pll ) and the analysis of spur characteristic of fractional - n frequency synthesizer using - ? modulating technology, the scheme of pll with mixer + quadrupler is confirmed as a result
文中，通過建立鎖相環路的相位噪聲模型，並分析了使用- ?調制技術的分數頻率綜合器的雜散性能，以此二者為理論依據完成了毫米波頻率源合成器的基本方案? ?鎖相混頻環+倍頻器方案。 -
At the doppler centroid aspect, this paper make use of maximum value method ; energy method and autocorrelation function method to estimate doppler centroid. at the doppler frequency aspect, this paper make use of image offset method ; time - frequency method ; minimum entropy and fractional fourier transformation method to estimate doppler frequency rate
在多普勒參數估計中，採用了最大值法、能量法和自相關函數法進行多普勒中心頻率估計;採用了圖像偏移法、時頻分析法、最小熵法和分數階傅里葉變換法進行多普勒調頻斜率估計。 -
Adaptive time - frequency representation based on fractional fourier transform
基於分數階傅立葉變換的自適應時頻表示 -
Second, efficient pitch detection is developed in frequency domain, which find fractional pitch. finally, harmonic phase reconstruction that exploits minimum - phase model is proposed
其次，本文開發了一種高效頻域基音檢測方法，使基音檢測結果精確到分數樣點。 -
The thesis describes a prototype fractional frequency synthesizer which is supported by a project granted by the ministry of science and technology of pr china. firstly, based on the principle of pll, this paper briefly describes three basic pll components : phase detector ( pd ), low pass filter ( lpf ), voltage controlled oscillators ( vco ), analyzes the linearized pll and summaries the transfer functions of third - order pll with ideal intergrator filter respectively. based on a microwave vco, the single point frequency pll frequency ranging from 2. 2 to 2. 5ghz is developed
首先，從鎖相環的基本理論、原理出發，分析了鎖相環中的三個基本部件：鑒相器、環路濾波器和壓控振蕩器，此後，針對線性化鎖相環進行了分析，研究了在使用比例積分濾波器時，三階鎖相環的環路參數計算；在電路實現時選用了lmx2353 ，在此基礎上，完成了2 . 2 ~ 2 . 5ghz范圍內的小數頻率合成器設計。 -
Recently it has also been applied to rf ( ratio frequency ) fields, and valuable achievements have been reached. ‘ fractal ’ has space filling ability and self - similarity ability. ‘ fractal ’ is a recursively generated structure by iterated function systems. it has a fractional dimension and possesses a self - similarity property. the concept of a ‘ fractal ’ has been applied to antenna design in order to reduce the size of antenna and obtain multi - band frequency operation
分形具有空間填充能力和自相似性，分形是通過迭代函數系統產生的具有自相似性的分數維結構，分形的概念可用於天線設計以實現天線的尺寸減縮和多頻特性，這在軍用和民用方面都有著非常廣泛的應用前景。 -
Secondly, the paper has a brief description of time - frequency analysis and fetches out the fractional fourier transform and analyses its advantage
其次，本文簡述了時頻分析的概要，引出了分數階傅立葉變換，分析了分數階傅立葉變換的優勢。 -
A " fractal " is a recursively generated structure having a fractional dimension and self - similarity property. the concept of a " fractal " has been applied to antenna design in order to reduce the size of antenna and obtain multi - band frequency operation. fractal antennas have broad application prospect in military and civil application
分形是通過迭代產生的具有自相似性的分數維結構，分形的概念可用於天線設計以實現天線的尺寸減縮與多頻特性，這在軍用和民用方面有著廣泛應用前景。 -
A " fractal " is a recursively generated structure having a fractional dimension and self - similarity property. the concept of a " fractal " has been applied to antenna design in order to reduce the size of antenna and obtain multi - band frequency operation. fractal antenna is useful in military and civil application
分形是通過迭代產生的具有自相似性的分數維結構，分形的概念可用於天線設計以實現天線的尺寸減縮與多頻特性，這在軍用和民用方面都有著很大的潛力。 -
The results indicate that sigma delta modulation could improve spurs of fractional - n frequency synthesizer in a certain extent
研究表明， -調制技術可以在一定程度改善小數分頻的雜散。 -
Sigma delta modulation frequency synthesis is an advanced technology that applies in pll ( phase - locked loop ) frequency synthesizer, which could transform the spurs created by fractional - n synthesizers into phase noise that could be filtered by inherent low - pass identity in pll
此技術應用-調制將鎖相環頻率合成器中分數分頻器產生的相位雜散轉化為相位噪聲，通過鎖相環本身低通濾波特性濾除，從而使用單環即可獲得很高頻率解析度和極低的相位雜散。 -
Study on steady - state performances of power system containing fractional frequency transmission lines
含有分頻輸電線路的電力系統穩態特性研究 -
The paper presents the schematic of s - band frequency synthesizer and the main circuits modules upon which, by considering the electromagenetic comptiblity ( emc ), fractional frequency synthesizer is fabricated by both pll and dds, the performance of the prototype product is carefully measured
並製作成功了高解析度、快捷變的小數頻率合成器的板級樣品。最後，還進行了樣品的性能測試，另外，還結合該實驗產品，進行了電磁兼容分析。 -
Image offset method that is also fast can be applied to motion compensation, time - frequency method is intuitionistic and have a better accurate, which is applied extensively on offline. fractional fourier transformation method is not accurate, but which have some now application in signal processing
在多普勒調頻斜率估計中，時頻分析法比較直觀，估計精度也不錯，脫機處理中獲得了廣泛的應用，圖像偏移法估計速度快，在運動補償中得到了應用。
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