phase spread 中文意思是什麼
phase spread
解釋
相伸張-
Secondly, in phase unwrapping to overcome the spread of wrong point, changing the patch of unwrapping phase is done to improve the correctness of it. then, the relation between the unwrapping phase and the height of reconstructed object is discussed detailedly. the data processing, algorithm analysis and reconstructing object are done for the collecting fringe image which are all based on matlab language, in all these achievements, the improvement and innovation aspect are following : a ) in order to stabilize the interference fringe, a new equivalent shifting object method is presented by using fringe stabilizing device to stabilize the interference fringe though moving object and ccd camera which fixed on a precise moving platform together, the experimental result shows the fringe drift is less than a / 20 in five minutes, and the equivalent phase shifting precision is x / 100
論文在全面闡述了光學三維輪廓位相測量術的發展、應用現狀、研究熱點及未來發展趨勢的基礎上，簡要介紹了傅立葉變換和相移位相輪廓測量術的基本原理，對兩種測量方法存在的問題及誤差進行詳細分析和比較；針對位相解包裹錯誤點的傳播問題，作者通過改變解包裹路徑來提高位相解包裹的正確性；分析討論從解包裹位相（ x ， y ）到再現物體的高度h （ x ， y ）物理量之間的關系，研究相應的演算法，利用matlab平臺，對實際採集的條紋圖像進行處理和輪廓重構，其中改進及創新工作主要表現在以下兩個方面： （ a ）針對干涉型結構光場干涉條紋出現的漂移抖動對相移的影響，提出了一種用條紋穩定器穩定干涉條紋，用精密移動平臺使物體和ccd攝像頭同步移動實現等效相移的方法，建立了相應的測量系統，系統的條紋穩定可以達到。 -
And vibration function make supplies viscidity and interior frictional force of particle reduce greatly, make the sport tempo of the particle of the supplies increase, has increased the number of times of colliding effectively, accelerate cement particle surface hyrate to speed that liquid phase spread, is it fully go on to mix and stir at micro competence to guarantee
而振動作用使物料顆粒間的粘性和內摩擦力大大減小，使物料顆粒的運動速度增大，增加了有效碰撞次數，加快了水泥顆粒表面水化物向液相擴散的速度，從而保證了拌和在微觀水平上的充分進行。 -
When signals pass high power amplifier, they would be distorted in amplitude and phase, leading to spectrum spread and distortion of in - band signals, both of which would weaken performance of the whole system in turn
在無線通信中，信號在通過高功率放大器時會產生幅度和相位失真，造成頻譜擴展以及帶內信號畸變，導致整個系統性能的降低。 -
Because of using spread spectrum technique, phase - coded radar has good anti - jamming capability and low probability of intercept property. so more and more attention has been paid to the research on it for military and civil application
相位編碼雷達採用擴頻技術使其具有良好的抗干擾能力和低截獲概率特性，因此在軍民兩用方面其研究日益受到人們的關注。 -
In wcdma system which uses direct sequence to spread spectrum, the spread spectrum code ( pn code ) phase of the receiver must be synchronized with that of the received signal precisely to despread and demodulate the signal correctly. multipath channel exists in the mobile communication environment for the radio signal reflection by obstacles between transmitters and receivers. by using the autocorrelation of the spread sprectrum code, rake receiver can process received signals and therefore multipath components can be resolvable
在wcdma系統中，為正確解擴解調接收到的擴頻信號，接收機本地產生的擴頻碼（ pn碼）相位必須和接收信號中的擴頻碼相位完全同步;同時移動通信環境中的傳輸信號由於接收機和發射機之間的直達路徑有可能被建築物或其他障礙物所阻礙，總是經過折射或反射的多條路徑后才到達接收機，從而產生多徑通道。 -
Synchronization technique of spread spectrum code is utilized in two stages. multipath searcher coarsely estimates the pn code phase and code tracking confirm the pn code phase precisely
這需要採用擴頻系統中擴頻碼同步技術，即:多徑搜索粗略地估計pn碼相位，同步跟蹤精確確定pn碼相位。 -
Recommended actions are different for the present phase of pandemic alert, the emergence of a pandemic virus, and the declaration of a pandemic and its subsequent international spread
對于當前的大流行預警階段、大流行病毒的出現階段、宣布大流行及其隨后的國際傳播階段存在著不同的建議行動。 -
In the wavefield - spread area, we uses the phase - shift operator as constraint in frequency - wavenumber field, while beyond the wavefield - spread data, we uses zero point at the ends of phase - shift operator as constraint to take discrete smooth interpolation so that the resulted operator satisfies two - order smooth and the length of this operator can be selected shorter in frequency - space field
通過離散光滑插值法，在頻率波數域中，以傳播區內的相移運算元為約束，在傳播區外的運算元兩端處以零點為約束，進行離散光滑插值，使得所得運算元具有二階光滑可導性，則其對應的頻率空間域中的運算元就可以取得很短。 -
A practical 4 - phase chaos spread - spectrum sequences
一種實用的四相混沌擴頻序列 -
This dissertation proposes to adopt poly - phase filtering channelized receiver to receive the special multi - carrier ds - cdma signal, which is studied by this dissertation, and use digital matched filter to de - spread signal
在此基礎上提出採用多相濾波器組通道化接收機來接收本文研究的多載波擴頻通信信號，並使用數字匹配濾波器進行解擴。 -
Multipath acquisition decide the coarse pn code phase and pick up the available multipath components. following, code tracking confirm the pn code phase precisely and track every multipath component ' s delay drifting due to doppler effect. in this paper, the code tracking technique in spread spectrum communication is introduced
本論文首先介紹了在擴頻通信中採用的同步跟蹤技術，結合wcdma上行鏈路的特點，提出了適合wcdma上行鏈路的pn碼跟蹤方案，並與現有的多徑搜索和通道估計演算法構成完整的上行鏈路rake接收機方案。 -
Using kalman model and gaussian random phase - screen fft, we simulated the distribution of illumination beam through long distance atmosphere and its frequency character. also other facts in simulation were analysised, such as reflection of niaterial under natural lighting, point spread function of optic system and electronic noise
文中用kalman譜模型和菲涅爾衍射的fft技術實現了照明光大氣傳輸的數值模擬，分析了照明光分佈規律，並提出了材料反射特性、光學系統、採集系統和圖像噪聲的模擬方法。 -
In this thesis, a kind of 2 - dimention signal acquisition method is presented which combines parallel pn code phase and carrier frequency acquisition, as a result the acquisition time is shortened greatly. besides, according to the fact that the detection of spread spectrum signals is always the key point in the receiving system
在擴頻信號的捕獲過程中要求有較小的時延和較高的概率，本文介紹一種二維信號的捕獲方法，這種方法結合偽pn碼和載波頻率的獲取，捕獲時延將大幅度降低，實際上，擴頻信號的檢測是接收系統的關鍵。 -
During the construction phase, it should make decision on loading speed according the dynamic supervising results and make decision on the adding spread time of road according the prognostic subsiding result after construction
在施工階段，需要根據動態監測的結果，對施工期的加載速度做出決策。根據工后沉降的預測結果，對路面的加鋪時間做出決策。 -
To despread and demodulate the signal correctly in the spread spectrum system, the pn code phase of the receiver must be synchronized with that of the input signal precisely. multipath channel exists in the wireless environment for radio signal reflection by obstacles between transmitters and receivers
在擴頻通信系統中，為正確解擴和解調接收到的擴頻信號，接收機的pn序列相位和接收信號的pn序列相位必須完全同步；同時移動無線環境中的傳輸信號總是被收發信機之間的許多障礙物所反射，從而產生多徑通道。 -
In the spread spectrum communication, the continuous - waves signal is transmitted. this kind of random time - variety may cause the varieties of the amplitude, doppler frequency and the phase of the received signal
在擴頻通信中，傳送的是連續波信號，這種隨機時變性會使接收信號的幅值、頻率和相位都發生變化。 -
Because of the reason above, a novel pn acquisition method using auxiliary sequence and binary search is proposed. because the cross correlation between auxiliary sequence and spread sequence is linear, some search algorism can be used to estimate the phase of incoming signal quickly without increasing the complexity of system
因為輔助序列與擴頻序列的相關函數近似滿足線性單調性，可以利用快速搜索演算法，如：二分法，對接收信號中擴頻序列的相位進行快速搜索，在保證系統復雜度不變的前提下，降低序列捕獲的時間。 -
Based on the theory of dsss, the received signal can be despreaded and demodulated only when the phase of spread sequence in the receiver is equal to the phase of the received signal, or the useful signal would be overwhelmed by the noise
根據直接序列擴頻原理，只有當接收端的本地擴頻序列與接收信號中擴頻序列相位一致時，即擴頻序列同步時，才能實現接收信號的解擴和解調，否則信號將淹沒在噪聲中。 -
After the analysis results are checked against the experimental results and, it is founded that a satisfactory agreement is obtained in elastic phase and a discontented agreement is gained in plastic phase since the influence of residual stress, degradation of cross - sectional stiffness and the spread of plastic zone length cannot be taken into account in plastic hinges theory
程序計算結果與試驗值相比，彈性階段吻合得較好，塑性階段由於塑性鉸法無法考慮殘余應力、剛度硬化以及塑性區長度的發武漢理工大學博士學位論文展等因素，因此與試驗值相比誤差偏大。 -
By comparing linear and digitized pll ’ s phase - transfer function, we obtained the relations between the two type pll ’ s parameters, thus gives out a scheme of digitized pll ’ s design. then the paper introduces the operating principle of the digitized costas loop used in spread spectrum communication systems
通過模擬鎖相環與數字化鎖相環的相位傳遞函數之間的聯系，推導了模擬鎖相環與數字化鎖相環各參數之間的關系，得到了設計數字化鎖相環參數的方法。
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