相對頻偏 的英文怎麼說

中文拼音 [xiāngduìbīnpiān]
相對頻偏 英文
relative frequency deviation
  • 相 : 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...
  • 對 : Ⅰ動詞1 （回答） answer; reply 2 （對待; 對付） treat; cope with; counter 3 （朝; 向; 面對） be tr...
  • 頻 : Ⅰ形容詞（次數多） frequent Ⅱ副詞（屢次） frequently; repeatedly Ⅲ名詞1 [物理學] （物體每秒鐘振動...
  • 偏 : Ⅰ形容詞1 （不正; 歪斜） inclined to one side; slanting; leaning 2 （只側重一面） partial; prejudi...
  • 相對 : 1. （面對面） opposite; face to face 2. （非絕對的） relative 3. （比較的） relatively; comparatively
  1. E., the carrier frequency of a gaussian beam deviates from the resonant frequency of a fabry - perot etalon ), variations of the peak intensity, the position of the peak intensity and the dwdm systems, has received considerable attention. in this work, after taking into account the wavelength - depended reflectivity distribution profile of a fiber bragg grating, the oscillation wavelength # _ ( 1 ) of long external cavity fiber bragg grat

    與共振情況（即高斯光束的載波頻率與法布里一拍羅濾波器的諧振頻率一致）相比，非共振條件（即高斯光束的載波頻率與法布里一拍羅濾波器的諧振頻率存在偏差）一透射光束的峰值強度、峰值強度所對應的位置、以及光斑的大小隨入射角的變化都發生了顯著的改變。
  2. The way of taking one nth out of capacitor ' s the first harmonic capacitive reactance as its nth harmonic impedance is verified whit the data from tang7c. according to the approximately estimating method, the first harmonic impedance of 220kv system is calculated. on the basis of the models, this paper gives the harmonic equivalent circuit of substation and gives the b ( n ) function of the harmonic time n. when the capacitors has different combination, b ( n ) ' s value will also change, with the inputting local measurement data, the paper studies the series and parallel resonance at the substation, and deduces that the reason the capacitor ' s fuse of tang6c is frequently interrupted is that its capacitor current contains a large number of 5th harmonics, and that the reason the discharging pt of tang7c capacitor being exploded is also that the 7th and 9th harmonic currents are amplified

    據此，對該站進行了串聯諧振分析和並聯諧振分析，並結合測試數據和有關變電站的運行記錄，指出了導致該站電容器湯6c頻繁燒保險的主要原因是5次諧波電流含量偏高，引起湯7c放電pt爆炸也是因為7次和9次諧波電流被放大。針對這些導致湯陰變電站補償電容器故障的原因，提出了相應的諧波治理措施，包括針對湯6c電容器5次諧波電流含量偏高的原因，提出了停運湯6c電容器或者通過把湯sc電容器的部分容量併入湯6c電容器（湯sc其餘部分停運）以增加湯6c諧波承受能力的措施;針對# 2變低壓側7次和9次諧波電流被放大的現象，提出了在湯7c電容器上加裝一定百分比的串聯電抗器的措施。
  3. The carrier wave is modulated directly by the baseband signal at several frequency point in l band and s band. firstly, this paper clarifies the theory of i / q modulation, elaborates evm and acpl, and analyzes the effect of amplitude and phase unbalance and dc offset on evm. secondly we review the basic principle of phase locked loop and it ’ s composing parts, including the basic conception and design method of pll frequency synthesizer, especially introduce the charge pump pll frequency synthesizer in detail

    首先，在闡述i / q正交調制基本原理的基礎上，通過對誤差矢量和鄰近通道功率泄漏的詳細分析，定性、定量地討論了各種非理想電路因素（如相位不平衡、幅度不平衡、直流偏差等）對調制器性能的影響;其次，介紹了鎖相環的工作原理和基本組成部分，包括鎖相環的設計和環路濾波器的設計，特別詳述了電荷泵鎖相頻率源;第三，介紹了採用直接調制技術模擬衛星信號的射頻前端的設計;最後，對整個直接射頻調制系統進行測試，結果基本上達到了課題要求。
  4. According to results of calculations and experiments, main causes that contribute to vibration are founded, then puts forward improving measures of adding deflexed supporting and suspending nogs and making pipelines shunt - wound, finally completes improvement tasks following is the main works completed in this thesis : ( 1 ) this thesis sets up a mathematic model of steam pipelines, using ansys5. 6 limited - unit analyzing software, calculates the ten phase inherent frequency and the foregoing eight phases vibration types of four steam pipelines of the unit before dealt with

    為了解決八零三電廠2號汽輪機四根主蒸汽導汽管道振動的問題，本文建立了相應的計算模型，並根據計算和實測結果，找出了振動的主要原因，提出了加裝偏轉支吊架和管道並聯的改進措施，完成了改造工作。本文主要工作是：建立導汽管計算模型，並應用ansys5 . 6有限元分析軟體，對機組四根導汽管治理前的10階固有頻率和前8階振型進行計算。
  5. According to iec ' s standards involved, voltage fluctuation and flicker become a index of power quality. but the research in those aspects such as harmonic frequency excursion and ect

    然而，人們對于電能質量中諸如諧波、頻率偏移等方面的研究相對電壓波動和閃變來說要多得多，研究得也較成熟。
  6. Then in allusion to biased momentum wheel system, based on classical control system a pid controller was design about pitching channel. according to specialty of roll - yawing channel, this paper discuss long - time cycle movement and short - time cycle movement. when design the control method of long - time cycle movement, whiff thruster is used to assistant the control system. when design the control method of short - time cycle movemen, in order to sovle the problem of coundn ’ t abtain the angular velocity signal, nonminimum phase controller advanced by terasaki is used

    然後針對偏置動量飛輪系統，基於經典控制理論設計俯仰通道的pid控制律，根據滾動?偏航通道耦合的特點，分別討論了由軌道角頻率和章動頻率引起的長周期運動和短周期運動。其中長周期運動控制律設計時，結合了噴氣推力控制來輔助偏置動量控制;短周期運動控制中，為了解決不能獲得角速度信號的問題，採用terasaki提出的非最小相位控制器進行控制。
  7. The research results are controlled source which has linear or nonlinear variabe frequency scan function and the seismic instruments which match with it, and the method of small group intervals, small offset, much more channels, short array length, high - frequency receivers are applied during the link of data acquisition, and that the techniques of the refraction static correction, the noise suppressing, the high - resolution velocity analysis, the wavelet length compression, the wavelet zero - phase, and the prestack migration should be applied emphasizedly during the link of data processing and interpretation

    研究表明，對于城市活斷層的抗干擾高解析度淺層地震勘探，在數據採集環節應採用具有線性或非線性變頻掃描功能的可控震源和與其相匹配的地震儀器，以及小道間距、小偏移距、多接收道、短排列和高頻檢波器接收的工作方法；在數據處理與解釋環節，要重視折射靜校正技術、噪聲壓制技術、高精度速度分析技術、子波壓縮技術、子波零相位化技術和疊前偏移技術等的應用。
  8. The problems of carrier frequency offset estimation under the condition of the agwn channel, frequency flat - fading channel and frequency selective - fading channel are studied in detail respectively

    本文仔細研究了在高斯白噪聲通道下、頻率平坦衰落通道下和頻率選擇性衰落通道下高精度估計信號載頻偏差的問題，並對相應演算法提出了一些改進辦法。
  9. China is one of the countries which are harmed by storm surge both tropical and temperate cyclones, the disaster of storm surge can occure every seasons and from south to north in china ' s coastal area. based on the analysis of the features of temporal and spatial changes of storm surge disaster in the recent 50 years, this paper focuses on the frequency changes of historical records in recent 500 years and measured data in recent 50 years of storm surge disaster and the relationships between storm frequency change and climate fluctuation. meanwhlie, the effects of future increase in the frequency of tropical cyclones landing or affecting china and relative sea level rise with global warming on storm surge disaster of china ' s coastal area also discussed. the results show that, in recent 500 years, there are direct relationships between storm frequency change and climate fluctuation, i. e., high global mean temperature correspond with high storm frequency and low mean temperature correspond with low storm frequency. storm surge disaster in china ' s coastal area will be exacerbated with global warming

    中國是全球少數幾個同時受臺風風暴潮和溫帶風暴潮危害的國家之一，風暴潮災一年四季，從南到北均可發生.本文基於中國沿海近50年風暴潮災時間變化和空間分佈特點的分析，著重探討了近500年全國及長江、黃河、珠江三角洲的歷史記錄和近50年實測風暴潮災發生頻次的變化及其與氣候波動的關系，並對未來全球變化背景下，中國沿海風暴潮災的變化趨向進行了討論.結果表明:近500年來，中國沿海的風暴潮災在氣溫較高的偏暖時段比氣溫較低的偏冷時段明顯增多.近50年實測臺風暴潮災的變化也是如此，而溫帶風暴湖的變化則與此相反.未來全球變化引起的登陸影響中國的熱帶氣旋頻次增加和相對海平面的上升，均將導致風暴潮災呈加重的趨向
  10. Decoying technology is effective means that deal with the anti - radiation weapon. based on the noncoherent decoy theory, a radar decoy model is established in rfss. the sixty - four - dollar question about confirming the coordinates of decoy on the array is discussed, and a mathematical model is found to deduce resolving arithmetic. finally, the simulation experiment verifies its validity. it is important to evaluate the anti - interference characteristics and research the countermeasures of anti - radiation weapon

    誘偏技術是對付反輻射武器的有效手段;在分析多點源非相干誘偏理論的基礎上，結合射頻模擬，對多點源非相干誘餌與反輻射武器的相對位置關系進行了研究，並給出了演算法，建立了模型，最後通過模擬對其進行了驗證;這對射頻模擬系統功能的完善、反輻射武器的抗誘偏性能評估的研究都具有重要的參考價值。
  11. For carrier synchronization, a method of estimating the ofiset of carrier frequency has been presented, which has a more broad range of the estimated oflset of carrier fiequency and more accurate result man other methods, then, a method of estimating the carrier complex phase has been presented, which corrects directly the ofiset of carrier phase

    對于全數字接收機中的載波恢復，先提出了一種估計范圍寬、估值精度高的載波頻偏估計演算法，接著介紹了一種可以直接對載波相位偏差進行補償的復相位估計方法。
  12. Based on the coherent reception theory of radio signals and the theory of digital signal processing, the effects of carrier frequency offset, sampling clock offset, and symbol timing offset on ofdm signals are exploited. a series of amendments and new algorithms is derived from the in being algorithms of guard interval based symbol timing and frequency offset estimation, frequency - domain frequency offset, sampling offset, and symbol timing offset estimation

    以無線信號的相干接收和數字信號處理理論為基礎，就載波頻偏、采樣鐘偏差和符號定時偏差對ofdm信號的影響進行了分析，對基於保護間隔的符號定時與載波頻偏估計演算法和多種現有頻偏、采樣鐘與符號定時偏差的頻域估計演算法進行了研究，提出了一系列改進措施與新演算法。
  13. Normally, we search the frame synchronization through computing the peak of self - correlation. because of frequency offset, the peak of self - correlation maybe vanishes. first, this thesis presents a solution trough compute the peak of auto - correlation basing on the standard 802

    針對傳統相關檢測對載波頻偏偏差敏感的問題，根據802 . 11a傳輸的幀結構特點，這兒提出了共軛互相關檢測的幀同步演算法，從而消除載波頻偏對幀同步相關檢測的影響。
  14. The design process of the multi - beamforming is presented detailedly, which include the orthogonal demodulation and resample technology, the schema of phase shift beamforming, and the effect of the frequency shift and the phase disturbance. the secondary filter is designed to eliminate the influence of the close frequency

    討論了頻偏和相位擾動對波束的影響；雙頻或三頻同時工作時，為消除相鄰頻率間的干擾，設計了二次濾波的特殊處理方法，模擬表明設計滿足要求。
  15. The task of carrier synchronization is tracking the frequency and phase of a carrier wave, the most effective means for tracking small frequency deviation and the phase of a carrier is using the phase - locked loop ( pll )

    載波同步的任務就是跟蹤載波的頻率和相位，對于載波相位及小頻偏的跟蹤，最有效的方式是使用鎖相環。
  16. However, compared with voltage deviation, unbalance of three phases, harmonics and frequency deviation, fluctuation and flicker are more complex to be detected, its research is relative to scarce, and the measuring devices are much less. hence, some further research on measuring voltage fluctuation and flicker has been done in the paper

    但與電壓偏差、三相不平衡、諧波、頻率偏移等電能質量問題相比，電壓波動與閃變的檢測較為復雜，研究相對不足，測量設備較少，因此，本文選擇這一問題進行進一步研究。
  17. Furthermore, this paper exploringly studies an 802. 1 la high - speed wlan with the 54mbps data rate, and presents a sort of time synchronization and frequency offset estimation method based on the frequency domain auto - correlation of the unique preamble training sequence of 802. 11 plcp frame ; the method have the high time precision, the wide frequency estimat ion range and short convergence process ; and moreover, it can applied to other frame communication system

    另外本文還對最高傳輸速率為54mbps的802 . 11a高速無線局域網系統進行了探索性研究，討論了ofdm調制技術在無線局域網中的應用；結合802 . 11a物理層數據幀結構特點，提出了一種基於前導訓練符號序列的頻域自相關時間和頻率同步方法，此方法具有定時精度高、頻偏估計范圍寬和同步建立迅速等特點，也適合於其它幀通信應用場合。
  18. ( before the proposal of this standard, use of ofdm was limited to continuous transmission systems ) combined with the national high technology project named " key techniques of the wireless module in fieldbus facilities ", author focuses on the research of baseband technologies of ieee802. il / lla physical layer, and put forward some novel algorithms about the timing and frequency offset synchronization and the channel estimation of ofdm transreceiver in wlan, which have been published on some kernel transaction and international conference and shows the author ' s great research achievements

    結合作者研究生階段「現場總線設備中的無線通信模塊關鍵技術研究」 863課題，作者對ieee802 . 11 11a [ 1 ]物理層基帶部分相關技術做了深入研究，提出了無線局域網中ofdm基帶系統時間同步、頻偏估計以及通道估計等關鍵演算法，在國內核心期刊和國際會議上發表了相關學術論文，本文在此基礎上完成的。
  19. This thesis adopts 8psk / qpsk modulation mode that ' s widely applied in short - wave communication to research all - digital blind receiver in burst mode based on software radio technology. then related solutions are given for the doppler frequency shift problem and multiple fading problem in short - wave channels. the arrangement of the thesis is below : chapter 1 gives brief description for the new technology and new systems of short - wave communication and for the development and appliance of software radio

    本文採用短波通信中應用廣泛的8psk qpsk調制方式，研究基於軟體無線電技術的突發模式全數字盲接收機，並對多音并行及慢速傳輸中存在的多譜勒大頻偏問題、單音串列、高速數傳時在短波通信鏈路中發生的干涉衰落問題做了研究，提出了相應的解決方案。
  20. Based on analysis of synchronization techniques in ofdm, this dissertation present a ml arithmetic to estimate time and frequency offset using symmetrical & conjugate prefix. the correlation peak of likelihood function curve is very sharp according this arithmetic, so the symbol synchronization by this arithmetic is exacter than that by general arithmetic using cycle prefix

    文中在全面分析ofdm同步技術的基礎上，提出了利用對稱共軛前綴的最大似然估計法來進行符號定時和頻偏估計，相對于傳統的利用循環前綴的最大似然演算法，這里提出的演算法可以獲得尖銳的相關圖樣，定時精度高，頻偏估計誤差小。
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