frequency error 中文意思是什麼

frequency error 解釋
頻率誤差
  • 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。
  • error : n. 1. 錯誤;失錯。2. 謬見,誤想;誤信;誤解。3. 罪過。4. 【數學】誤差;【法律】誤審,違法;(棒球中的)錯打。adj. -less 無錯誤的,正確的。
  1. The methods of direct measurement with low precision such as frequency and time interval methods and the methods of indirect measurement with high precision such as beat frequency method, dual mixer time difference method and frequency difference multiplying method are supported on the platform. the fundamentals of each method are studied. the quantization error is analysed and the illustration is given for each method

    該平臺支持直接頻率和時差法兩種較低精度的測量方法以及雙混頻時差法、差拍頻率法和頻差倍增法高精度的簡接測量方法,本文研究了各種測量方法的原理,對各種測量方法的量化誤差作了分析,並給出具體的實例。
  2. Cycle frequency - based blind beamforming shows the performance degradation due to cfe ( cyclic frequency error ). an improved algorithm is presented in literature 6, which adopting forgetting factor in estimation cyclic correlation matrix would largely depress the sensitivity of cab to cyclic frequency error. by using this method, the improved algorithms of the c - cab and ecab algorithms are presented in this dissertation

    針對基於循環頻率的盲波束形成演算法對循環頻率誤差cfe ( cyclicfrequencyerror )很敏感而導致演算法性能下降的情況,參照文獻[ 6 ]提出的遺忘因子cab演算法,提出了c - cab演算法以及基於特徵空間的盲波束形成演算法( ecab )的改進演算法。
  3. On the base of researching the theory of the scheme and analyzing the signal feature, it is obtained that the existence manners and character of distance information in the differential frequency signal. at the same time, a new conclusion is gained that the technology of frequency agility can decrease the constant error of system. it is also to say that frequency agility and frequency modulation fixed - distance fuze has the similar feature to random period frequency modulation fixed - distance fuze. according to the theory of address coding in the hopping - frequency communication, the paper presents the principle of selecting the frequency agility sequence which fit to the radio fuze and constructs the frequency agility sequence family based on the rs codes

    在深入研究方案原理和分析信號特徵的基礎上,獲得了該體制引信差頻信號中,距離信息的存在形式和特點,得出了頻率捷變技術的引入降低了系統定距固定誤差這一新的結論,即頻率捷變調頻定距引信在定距性能上具有類似隨機周期調頻定距的特徵。本文引入跳頻通信地址編碼理論,結合無線電引信的具體特徵,提出了適用於無線電引信的頻率捷變序列的選擇原則,並構造了基於rs碼的寬間隔頻率捷變序列族。
  4. Finally, this thesis discussed these following questions : first, the algorithm of used the error image for improving the purpose of the edge detection. secondly, we have transformed the solved question of the first and the second directional derivative to frequency domain and founded they have a single formulae in frequency domain. thirdly, we have described the singular signal and the noise by using the correlations of the neighbor data after wavelet transform

    最後,在傳統的邊緣檢測演算法和小波分析的邊緣檢測演算法之外,對以下幾個方面也進行了一些討論: 1 )利用誤差圖像來提高邊緣檢測效果的演算法; 2 )將求解任意方向的一階、二階方向導數的問題轉換到頻域中去求解,發現在頻域中它們具有簡單易用的公式,使得原來求解任意方向的一階、二階導數的比較困難的問題變得容易實現了。
  5. The structure of the testing platform is described, and the experiment content and principles are given in detail. the transmission error curves and space frequency curves are emulated. the circuits of rotor part and software are finished

    本文介紹了實驗臺的整體結構,實驗內容的設置和各實驗的工作原理,模擬了傳動誤差曲線及其空域頻譜圖,詳細闡述了轉子測量的電路設計、下位機程序設計和上位機的軟體設計。
  6. Firstly introduced the basic theory and method with which the analog signal can be convert to digital form, including sampling theory and course, quantification and quantification error, coding, beside those we discussed some applications of sampling technology, the reason of frequency mixture and the method to eliminate it chapter 4 introduced analog mux - switch, for the reason of simpleness we only introduce it briefly

    從第3章開始,對數據採集的基本理論進行討論,首先介紹了模擬信號數字化處理中的基本理論、方法,包括采樣過程、采樣定理、量化與量化誤差、編碼,還討論了幾種采樣技術的應用、頻率混淆產生的原因及消除措施。第4章,介紹了模擬多路開關。
  7. Compressor running frequency when error

    故障時壓縮機開停比
  8. It designed signal amplifying circuit, frequency tricking circuit, data sampling and keeping circuit. the choice of 12 bits high accuracy a / d integrated data sampling card made program simply, high flexible and expandable. and to each error which is likely to occur in high voltage capacity type equipment during the monitoring, analysis and judgement are given

    在硬體電路實現上,注意選擇信號傳感器;合理設計了信號放大電路和濾波電路;設計了頻率跟蹤電路,數據采樣/保持電路;結合軟體控制選用了12位高精度的a / d轉換器,使軟體編程簡化且具有較高的靈和性和可擴展性。
  9. 5. a multivariable process identification based on asymptotic black - box theory is studied. firstly, a high - order mimo arx model and its frequency error bound is estimated from identification data and low - order siso models is obtained from high - order mimo arx model

    作者對一種基於漸近黑箱理論的多變量過程辨識方法進行了研究:首先用高階arx模型估計模型參數,並給出高階模型的頻域均方誤差;然後,對高階arx模型進行降階處理。
  10. And typical super heterodyne structure in rereiver part. this scheme benefited to reduce frequency error and phase error, and had the advantages of good dynamic range and selectivity, short exploitation cycle and small venture in the given performance demand, etc. this system implemented a six - layer hoard rf handset model together with baseband by using advanced eda tool veribest 2000

    系統設計應用hd155131的gsm900 dcs1800雙頻解決方案,發射機部分主要採用offsetpll方案,該方案有利於減小系統的頻率誤差和相位誤差;接收機部分採用典型的超外差式結構,它具有優良的動態范圍和選擇性,在給定的性能要求下具有開發周期短、風險小等特點。
  11. Maximum likelihood frequency error estimation based on cordic

    演算法的最大似然頻差估計
  12. Inherent frequency error

    固有頻差
  13. A normal co - axis he - ne laser tube with bore length l = 190 mm was used. with pid and self - organised fuzzy control, the frequency error could be confined to a 10 ~ 9 level. in addition, preheating time and anti - interference were within requirements

    選用腔長l = 190mm的普通同軸式he一e激光管,採用pid和自組織模糊控制模式可達到10一的穩頻精度效果,並滿足預熱時間和抗干擾要求。
  14. Especially forgetting factor ecab has excellent performance under large cyclic frequency error

    特別是遺忘因子ecab演算法,在循環頻率誤差較大的情況下,仍能保持很好的性能。
  15. Chapter three provides synchronization algorithms in dvb - t cofdm receiver, including symbol timing recovery, carrier frequency error estimation and sampling timing recovery. chapter four introduces some channel estimation algorithms based on interpolation in dvb - t receiver. five estimators are compared, in terms of mean - squared error both in rayleigh channel and ricean channel

    第三章首先討論了由於載波頻率偏差、符號定時偏差和采樣定時偏差對ofdm系統所造成的影響和干擾,然後針對dvb - t系統的cofdm接收機方案,分別給出了符號定時同步、頻率同步以及采樣鐘同步的實現演算法,並對它們的性能進行了分析模擬。
  16. The coarse frequency error estimator has a wide estimation range and may be used for initial caption. and the fine estimator can achieve nice performance in multipath environment

    該粗估計器有很大的估計范圍,可用於頻偏的捕獲;而精估計器在多徑環境下能得到很好的估計效果。
  17. It not only considers the effect of frequency error and data modulation, but also realizes code synchronization and frame synchronization at the same time. all these research work will give a valuable reference to the design of the new communication systems

    本文對擴頻通信系統構成和原理,擴頻序列設計與優選,擴頻序列同步問題進行了研究,並進行了相應的模擬。
  18. Exploiting the cyclostationarity of ofdm signals in multipath environment, we further introduce an ofdm coarse frequency error estimator and an ofdm fine synchronizer

    利用接收信號的循環平穩性,結合通道響應提出了一種ofdm頻偏粗估計器和一種ofdm定時偏差和頻偏精估計器。
  19. The reason of high to middle frequency error is analysis

    分析了中高頻誤差的成因。
  20. Experiments have demonstrated that, under the condition of constant temperature ( 20 ), the frequency error of double - frequency laser interferometer with two longitudinal modes could be controlled within 10 " 9 even with conditions such as with cool or hot air blowing, it can still be kept within 10 " 7. self - organised fuzzy control methods can be realised in a single - chip processor which contains fuzzy optimisation and self - organisation functions. the above - mentioned system possesses the following advantages : simple

    / znl (式中c為光速, l為諧振腔長, n為空氣折射率,其值約790mhz ) ,原理上對目前可能要求的測量速度都能滿足;它發出的光為一對互相垂直的線偏振光,與塞曼型雙頻激光干涉儀相比,它不用外加軸向磁場及1 / 4波片,因此結構簡單,造價低廉。
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