propagation signal 中文意思是什麼

propagation signal 解釋
傳動信號
  • propagation : 持續培養
  • signal : n 1 信號，暗號；信號器。2 動機，導火線 （for）。3 預兆，徵象。adj 1 暗號的，作信號用的。2 顯著的...
  1. Ignored the amplified spontaneous emission ( ase ) and esa, rate equations and propagations equations for continuous wave er ~ ( 3 + ) / yb ~ ( 3 + ) co - doped phosphate glass waveguide laser were calculated using runge - kutta algorithm. propagation characteristics of signal and pump light in the waveguide were analyzed too

    利用fd - bpm法，對在平板波導以及波導折射率為漸變折射率分佈的溝道波導和掩埋型波導內傳播的波長為980nm的泵浦光和1540nm的信號光的光場進行了模擬。
  2. Analysis of signal energy transmission in blue - green laser uplink propagation model

    藍綠激光上行傳輸通道的信號能量傳遞分析
  3. In order to utilize the frquency resource adequately and increase the capacity of mobile communication system, the wireless electric wave propagation of existing mobile system always adopts the microcell structure. forecasting the path loss characteristic of electric wave accurately can provide the necessary condition for the layout and design of wireless network, at the same time it is a precondition for the research on the microcell mobile system. the methods of forecasting of wireless electric wave propagation can divide into two parts : one is pluse and respond, that is establish the empirical model based on experimental and statistical data ; the other is ray tracing method, that is establish the deterministic model based on theoretical analyse. the paper discuss the characteristic of wireless signal electric wave transmition in symmetrical atmosphere of earth, and introduce the common path loss transmition model in land mobile communication system, also point out the localization of these models based on experiential methods

    而精確預測無線電波傳播路徑損耗特性，則為合理的微蜂窩無線網路規劃、設計提供了必要條件，同時也是研究微蜂窩移動通信系統性能的前提。無線電波傳播預測的方法分為兩類：一是用沖激響應法，即根據實驗、統計所得數據建立經驗性傳播預測模型；另一種是用射線跟蹤方法，即依據理論分析來建立確定性的傳播預測模型。本文首先討論了在地球表面均勻大氣中的無線電波傳播的基本特性，介紹了陸地移動通信系統中常用的幾種電波傳播路徑損耗經驗性預測模型，並指出了這些經驗性傳播模型對于微蜂窩小區無線電波傳播特性研究的局限性。
  4. In 1992, a. enders and g. nimtz researched the propagation of microwave signal through several different cutoff waveguides with hp8510b network analyzer ( na ) system and hp70820 transition analyzer ( ta ) system. since 1990s, emig, martin and landauer have been investigating the propagation of electromagnetic pulse through a waveguide with piecewise different dielectric constants

    1992年，德國科隆大學的enders和nimtz採用hp8510b網路分析儀系統和hp70820轉換分析儀系統研究了不同結構的截止波導中的信號傳播，並計算出調制音樂穿過截止波導的時間小於其在真空中的傳播時間。
  5. In 1992, a. enders and g. nimtz researched the propagation of microwave signal through several different cutoff waveguides with hp8510b network analyzer ( na ) system and hp70820 transition analyzer ( ta ) system. since 1990s, emig, martin and landauer have been investigating the propagation of electromagnetic pulse through a waveguide with piecewise different dielectric constants

    1992年，德國科隆大學的enders和nimtz採用hp8510b網路分析儀系統和hp70820轉換分析儀系統研究了不同結構的截止波導中的信號傳播。從90年代開始， emig和martin 、 landauer等人研究了分段填充不同介質的波導中的電磁脈沖波的傳播。
  6. In order to achieve high data rates on the severely band - limited underwater acoustic ( uwa ) channels, bandwidth - efficient modulation techniques must be employed, together with some sophisticated signal processing algorithms, such as adaptive equalization technique for the intersymbol interference caused by channel multipath propagation

    在帶寬嚴重受限的水聲通道中實現高數據率通信，必須使用高帶寬利用率調制技術，並結合自適應均衡等技術以有效地克服通道多途傳播產生的符號間干擾。
  7. The propagation of wireless signal is extremely random

    無線信號的傳播具有極度的隨機性。
  8. In this thesis, we follow the idea of the beamlet - domain wave field extrapolation methods to construct localized propagators. through comparative study of signal decomposition efficiency using different representation schemes, we select two groups of basic functions with simple expressions and good localization properties for wave field decomposition, propagation and imaging

    本論文通過對wft 、小波基、小波包，以及相關的框架理論等的分析比較，選擇了兩組形式簡單，且具有適宜於波場外推特性的基本函數集合來進行波場分解、傳播及偏移成像問題的研究。
  9. Early in the process of marking out network, mobile communication corporations need to avoid the existence of no - signal areas in order to provide good services, so the study of propagation prediction in regions became an important task

    早期移動通信運營商在規劃網路過程中，需要消除信號盲區的存在，因此研究區域環境內電磁波傳播特性就成為一個重要課題。
  10. Based on the facts that time of arrival ( toa ) of the first multipath signal is always most close to that of los propagation and angle of arrival ( aoa ) of the first multipath signal is not always most close to that of los propagation among all multipath signals in nlos propagation environment, a location algorithm is proposed to mitigate the influence of nlos propagation, which effectively reduces the feasible region of a ms in macrocells

    依據在非視距傳播環境下存在的以下兩個事實：第一，最先到達多徑信號的波達時間總是最接近直達波的波達時間。第二，最先到達多徑信號的波達方向並不一定最接近直達波方向。針對宏蜂窩系統，從有效減小移動臺可行域的角度，提出了一種減輕非視距影響的定位演算法。
  11. Research of error resilience technology for video communication based on h. 263 codec major : signal and information processing data : author : meng yan signature : tutor : zhang erhu liu shichang signature : abstract the reconstructed image quality can be degraded substantially by errors during the transmitting over the communication channel, especially when the video is compressed by temporal and spatial coding ways, which leads to error propagation in frame sequence, so the error resilience procedure should be performed to improve the reconstruction quality

    由於通信系統的通道不可避免的存在噪聲，傳輸數據流必然存在誤碼。對于h . 26x的視頻編碼流，由於空域和時域的壓縮方法以及熵編碼方法的應用，即使是一個比特的錯誤，常會影響一個區域的圖像不能正確解碼，同時錯誤的圖像還會擴散影響后續數幀圖像。因此有必要在標準解碼程序的基礎上，添加容錯功能。
  12. As compared with the solution using pulse envelope representation, the propagation equation using complex analytic signal representation reveals different spatiotemporal behaviors such as spectrum redshifting, narrowing, and pulse broadening, etc. 2

    復解析信號解會出現光譜紅移、變窄、脈沖變寬等與脈沖包絡解不同的時空特性。
  13. In this paper, first, the study of the distribution of electromagnetic field, energy, power, reflection coefficient and transmission coefficient in waveguide with piecewise different dielectric constants are studied. then, the behavior of propagation of am signal and gauss pulse signal through the waveguide are simulated by magic code ， and the plots of electromagnetic field, energy, ponyting vector and their spectrums at different time and different position are obtained. and, the group velocity and energy velocity of wave packet through barrier are calculated

    從90年代開始， emig和martin 、 landauer等人研究了分段填充不同介質的波導中的電磁脈沖的傳播。在本論文中，作者首先推導出分段填充不同介質的波導中的電磁場分佈、能量、傳輸功率以及反射系數和傳輸系數的表達式，然後，採用magic程序模擬了這種波導結構中電磁波的傳播情況，得到了在不同時刻和不同位置處的電磁場分布圖、能量圖、坡印廷矢量圖以及它們的頻譜圖，並由模擬結果計算了波包穿越勢壘的群速和能量速度。
  14. This dissertation has studied the effects caused by terrain environment on the propagation of rf signal. the effects includes land clutter, multipath and diffraction

    論文主要研究地面環境對射頻信號傳播的影響，包括三個方面的內容:地雜波效應、多路徑效應和衍射效應。
  15. The forward calculation of control signal and back - propagation of network - weight modification equations are given, along with the principle to specify the initial net - weight values. the output of the network is set with limit. simulation shows turbine controlled with the n - pid governor can achieve good static and dynamic characteristic

    推導出了n - pid控制器的前向演算法和反傳演算法，討論了n - pid網路權重初值的確定和對輸出進行限幅的處理，在對使用n - pid控制器的水輪機調節系統所作的模擬實驗中，獲得了良好的動態和靜態性能。
  16. In electrical communications the information source provides an electrical signal, usually derived from a message signal which is not electrical ( e. g. sound ), to a transmitter comprising electrical and electronic components which converts the signal into a suitable form for propagation over the transmission medium

    在電通信中，信息源提供一個電信號到傳輸器上，這個電信號通常來源於一個非電的消息信號例如聲音.傳輸器由電器件和電子器件構成.它把信號轉化為一個合適的形式，從而在傳輸媒介上傳播
  17. In this paper, first, 1 made a study of the distribution of electromagnetic field, energy, power, reflection coefficient and transmission coefficient in waveguide with piecewise different dielectric constants. then, i simulated the behavior of propagation of am signal and gauss pulse signal through the waveguide by magic code, and gave the plots of electromagnetic field, energy, ponyting vector and their spectrums at different time and different position

    在本論文中，作者首先推導出分段填充不同介質的波導中的電磁場分佈、能量、傳輸功率以及反射系數和傳輸系數的表達式。然後，採用magic程序模擬了這種結構的波導中的電磁場的傳播情況，得到了在不同時刻和不同位置處的電磁場分布圖、能量圖、坡印廷矢量圖以及它們的頻譜圖。
  18. In mimo systems, the signal can be sent and received through multiple antennas or antenna arrays. the combination of ofdm and mimo can effectively alleviate the problem of multi - path propagation, increase system capacity, and obtain more robust system capability, so they are considered as the main stream techniques of the future wireless communication system

    Ofdm技術固有的抗通道多徑和頻率選擇性衰落特性以及mimo在提高系統頻譜利用率，改善無線通信系統性能等方面的巨大作用，使得這兩種技術的融合成為了下一代移動通信系統的必然選擇。
  19. In satellite navigation and positioning system, time is important information for fast and direct acquisition of long cycle code, one of its important aspects is the uncertainty compression of signal ' s propagation delay to reduce time search range

    摘要衛星導航定位系統中，輔助長碼快捕的一個最重要的信息是時間信息，衛星信號傳播時延估計是提供先驗時間信息，減少時域搜索范圍的一個重要方面。
  20. With the characteristics of large ambient noise, very narrow bandwidth, low carrier frequency, great propagation latency and time - space - frequency variant multipath effect ( mpe ), the stochastic ocean channel has demonstrated the greatest complexity and difficulty for underwater acoustic wireless communications. among them multipath effect ( mpe ) is the most difficult obstacle that results in signal fading and inter - symbol interference ( isi )

    但是噪聲高、帶寬窄、載波頻率低、傳輸時延大、多途徑效應隨時間?空間?頻率變化等通道特性都會給有效、可靠的水聲通信帶來很大的麻煩，其中多途徑效應是最主要的困擾因素，它會導致信號幅度衰落和碼間干擾。
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