frequency difference 中文意思是什麼
frequency difference
解釋
頻差- 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。
- difference : n. 1. 差異，差別。2. 不和，爭論。3. 【數學】差，差額。4. 【邏輯學】特殊性。vt. 〈罕用語〉區別，使有差別。
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It also evaluates the performance of frequency difference estimation of afc
分析了多徑條件下afc頻差估計的性能。 -
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。 -
Third, according to an example, the influence on soil displacement stress etc under harmonic vibration load induced by infiltration coefficient and loads frequency variation is studied numerically in dissertation. finally, the difference of layered saturated soils consolidation between rectangle and harmonic vibration loads is studied in this dissertation
再次，以數值方法研究了簡諧荷載作用下成層飽和地基二維biot固結的一般規律，同時還研究了固結情況受滲透系數，頻率等參數影響的規律。 -
The ring laser gyro ( rlg ) is a new photoelectric inertia sensor based on the optic interference theory. it uses the difference between the frequency of the two beams of light, which run in the opposite direction in the resonant cavity, to measure the carrier ’ s rotate speed and the orientation in the inertial space
環形激光陀螺儀（ ringlasergyro ，簡稱rlg ）是以光學干涉原理為基礎發展起來的新型光電慣性敏感儀器，它利用環形諧振腔內順、逆運行的兩束光的諧振頻率差來測量載體對于慣性空間的轉速和方位。 -
Photographic sound record ; difference frequency method for measurement of non - linear distortions
攝影錄音.測量非線性失真的差頻法 -
In this paper, porous nanocrystalline titanium dioxide films were used to modify the surface of quartz crystal microbalance ( qcm ), the response of qcm with high roughness layer hi liquid phase was discussed, and the difference between the theoretic value and frequency response measured was illustrated in detail
本文採用tio _ 2納米粒多孔膜修飾壓電晶體傳感器，對高粗糙度壓電傳感器的響應進行了探討，闡明了在液相中壓電響應的實際值與理論值產生偏差的主要原因。 -
The specific research methods are listed : 1. matched filter taking the max ouput snr as the best rule correlates nonstop divided signal and divided echo to detect low snr target signal. then all one dimension divided correlation outs and done fft in portrait to leach interferential signal such as static or low rate mussy meaves, many pathway echo and so on and to take target ' s time difference and doppler frequency that combine parameters that target ' s direction taken from antenna and so on to implement target ' s orientation and tracking
具體研究方法如下： 1 、採用以輸出信噪比最大為準則的最佳匹配濾波器來對分段的參考和目標信號作相關處理來檢測低信噪比目標信號，然後對一維分段相關輸出組作縱向傅立葉變換來濾除靜態或低速的雜波、多徑回波等干擾信號，並提取目標的時差和多普勒頻率，再結合由天線獲得的目標方向等參數，就可以實現目標的定位和跟蹤。 -
Therefore, the three fundamentals required to obtain high precise measurements are : 1 ) frequency stability and frequency difference stability of the double - frequency laser source as well as the stable equivalent length of bore ; 2 ) the measuring beam and the reference beam are placed very co - axially ; 3 ) capability of recording the sub - division of the period of phase change and a reversible counter system
因而干涉儀系統達到高精度的基礎是：頻率及頻差穩定的雙頻激光源、穩定的等效腔長；測量光與參考光合光後有很高同軸度的光路結構；能可靠記錄相位差變化周期數的細分及可逆計數系統三部分。 -
Abstract : we have studied the polarization beats spectroscopy with phase - conjugation geometry in a cascade three - level system. it was found that the accuracy for the energy - level difference measurement is determined by the homogeneous linewidths of the optical transitions. under the condition for the occurrence of beating, the frequency difference of the beat between two independent light sources could exceed the laser linewidth. the measurement accuracy for laser absolute frequency could reach the same order of magnitude as the laser linewidth
文摘:研究了級聯三能級系統中的相位共軛極化拍頻光譜術.發現其對能級差的測量精度決定於光學躍遷的均勻增寬.在符合拍頻條件時，兩獨立光源拍頻的頻差可以超出激光線寬，激光絕對頻率的測量精度可達到與激光線寬同一量級 -
Secondly, the dissertation presents a 3 - dimensional searching method with afc and pn code synchronization and adaptive array convergence in order to accurately estimate the frequency difference between the received signal and the local oscillator
其次，為了準確估計接收信號和本地振蕩器之間的頻差，提出了afc 、 pn碼同步、自適應陣收斂的三維搜索策略。 -
The main technique of solid state memory system include the techniques of design for reliable and lower power dissipation and valid data sampling, data framing and encoding, data storing and retrieving on high speed, data disturbing and frequency difference processing
星載固存系統設計的主要技術包括可靠性設計、低功耗設計、有效數據采樣、數據組幀編碼、數據高速存儲及回放，數據加擾，輸入輸出頻差兼容設計等技術。 -
In the experiment, we first get all window sequences and the relative difference a which reflects the frequency difference of window sequences
對序列中的所有窗口序列都給出相對差，根據分別得到編碼區序列和非編碼區序列的特徵序列。 -
The algorithm solves the question of frequency difference between uplink and downlink
解決了上、下行鏈路的頻差問題。 -
Theoretic and experimental study on large - frequency - difference side - mode injection locking of high power semiconductor lasers for laser cooling
用於激光冷卻的半導體激光器大頻差邊模注入鎖定的理論及實驗研究 -
The emphasis was put on the main factors affecting its performance, such as : drift of the average frequency of interferometer ; drift of frequency difference of interferometer ; the changes of the interference add - on term of the gaussian beam during the measurement and its effects on the phase changes, as well as the relationship between the changes of the interference add - on term of the gaussian beam during the measurement with the movement of the measurement mirror
對雙頻激光干涉儀的工作原理進行了理論分析，著重分析了其主要影響因素：雙頻激光平均頻率漂移；雙頻激光差頻漂移；高斯光束干涉附加項在測量過程中的變化及其對相位變化的影響，與測量鏡運動引起的程差變化的關系。 -
On the other hand, we give the condition of correctly solving range ambiguity and performance calculating formula of for stagger frequency difference ; condition of constraint for deciding stagger parameter value ; range " s analysis result for targets with multiple scattering centers or low altitude. this part includes chapter 2, 3, 4, 5
另外，我們還給出了參差比相測距正確解模糊的條件以及參差測距下的性能公式；提出了決定參差參數取值的約束條件；給出了多散射中心目標和低空目標的多頻連續波測距性能的結論。 -
To validate the performance of the system, a series of experiments are made on a 200mw unit simulator of max1000 dcs. the results of these experiments indicate : by following certain physical principles, for each real component of the control system, the mathematical model which is constructed to reveal its characteristics reflects exactly the work and message transfer process ; by considering the load demand to the unit and the electricity net ' s frequency difference, also combing with the real capacity that the unit can stand, the ccs and deh models, which are contrived by using simulation blocks, can exactly harmonize the control of the turbine and the boiler and can also control the load.
為驗證模型的性能，本文在基於max1000dcs系統的200mw機組模擬機上進行對建立的控制系統模型進行了一系列模擬試驗，試驗結果表明對控制系統的每一實際組件按照一定的物理規律所建立的反映其功能特性的數學模型，正確地反映了其工作過程及信息傳遞過程；利用模擬模塊開發的協調控制系統及功頻電液控制系統模型能夠根據對機組的各種負荷要求和電網的頻率偏差，結合機組所能承擔負荷的實際能力，正確地協調對汽輪機和鍋爐的控制，並對負荷加以控制。 -
The frequency difference sensitivity of the modulation mode and the ability to overcome distortion by limiting amplitude of the signal and to overcome interference also affect the performance, too. in this paper, the relationship between the ability to overcome interference and the modulation mode is discussed at first. then the characters in some aspects specif ' ed above of some common modulation mode such as mfsk mpsk ofdm are studied. on this base, some according solutions to the problem of the different frequency - hopping system are put forward. in the past half of this paper, the realization scheme, pcrforemance and improving measures of ofdm are studied
本文首先較詳細地討論了跳頻抗干擾的能力與調制制度的關系，接著分別研究了幾種常用調制方式（ mfsk ， mpsk ， ofdm ）上述幾方面的性質，針對各跳頻系統存在的問題提出了相應解決方案，在本論文後半部分重點討論了ofdm跳頻系統的實現方案、性能及改進措施。 -
Analytic technique of frequency difference for discrimination of cavity fillers
溶洞充填物判識的頻率差異分析技術 -
And it presents an estimation method for frequency difference by means of data synchronization selecting the time window of afc frequency difference estimation hi order to solve the problem that data symbol transition induces an enormous error of frequency difference estimation
針對afc頻差估計中數據突變引起頻差估計較大誤差的問題，提出了利用數據符號同步對afc頻差估計時間窗口選擇的afc頻差估計方法。
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