分組天線 的英文怎麼說
中文拼音 [fēnzǔtiānxiàn]
分組天線
英文
grouantenna-
Mr. leung and mr. yeung, applying the new technology in data processing, reduced the size of the system and its energy consumption, making the system easy to carry and install. they also made use of the general packet radio service data transmission technology to provide one - stop data transmission from remote areas without land lines back to the observatory headquarters 24 hours round the clock
梁賢基先生及楊志宇先生應用新科技于數據處理，縮減了系的體積及耗電量，方便安及攜帶亦採用通用分組無線服務gprs資料傳輸技術，在沒有固網服務的遍遠地區運作，亦能"一站式" 24小時無間斷地將資料傳送回天文臺總部。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。The characters of this antenna lie in three points : using yagi - uda antenna to obtain antenna gain through the radial direction ; making full use of the space of the base station along the z - axis direction to get array gain ; arranging the antenna array properly to achieve pattern diversity in azimuth plane
其特點集中體現在三個方面:在天線徑向通過八木天線的形式獲得增益;充分利用基站空間在z向組成陣列獲取陣列增益;利用開關八木天線方向圖可重構的特性，通過合理的布局，在方位面內實現角度分集。In that mainly including communication work mode, project argumentation of system, performance analyses and type choosing of communication transmitter - receiver and the design of antenna system, etc. in chapter 3, coding mode of msk and gmsk and the hardware circulation realization of modem are discussed in detail
在第二章里，介紹無線電通信系統總體設計，按通信系統組成，逐項進行計算，主要包括通訊工作方式和體制的方案論證，通訊電臺性能分析、選型、參數，以及天線系統的論證等。在第三章里，詳細論述msk和gmsk編碼方式，以及用fx909實現數據機的硬體電路。First we introduce it by presenting the classic 2tx scheme proposed by alamouti. then the orthognal designes for space - time block codes are explored, the detailed analysis of the performance is presented. the link level simulations are performed in the last part
通過alamouti的2天線方案來理解空時分組碼，接著研究了空時分組碼的正交設計，最後對其性能進行了詳盡的分析，並完成了鏈路級模擬。It has the characteristic of non - gear - box, large output torque, small volume, easy control, fast response, high track precision, high reliability etc. the system has potential advantages over substituting for traditional hydraulic or pneumatic missile actuator servo control system and has wide prospect in the fields of aerial actuator, servo valve, robot, radar antenna etc. the system ' s operation principle, control idea, functions and realization of each component are discussed in detail
該系統在取代傳統的液壓、氣動導彈舵機伺服控制系統方面有很大潛力，同時在航空舵機、伺服閥，以及機器人關節的直接驅動、雷達天線等領域具有廣闊的應用前景。論文詳述了系統的工作原理與控制思想，以及系統方案的設計和各組成部分的功能與實現方法。The novel three - dimensional finite - difference approximations of mur ' s absorbing boundary conditions are also presented in frequency - domain. then the ddm based on fdfd is investigated in the applications of three - dimensional electromagnetics problems. and it is used to analyze the leaky wave antenna based on image nonradiative dielectric ( nrd ) guide
最後，闡述了maxwell方程組和劃分區域的despres傳輸條件的頻域差分格式建立，在截斷邊界上構造了三維頻域mur條件的差分近似，探討了基於頻域有限差分的區域分解法在三維電磁問題中的應用實現，並將該演算法用於分析一種基於nrd波導結構的漏波天線。The mathematic model of antenna is used in digital tv system network layout and simulation. the disquisition educes the mathematic model of omnidirectional multilayer tv antenna
摘要這里利用電磁場理論和計算機輔助分析的方法導出電視工程常用的全向多層振元電視系列天線的數學模型，並應用於地面數字電視的單頻網組網實踐。Then, we establish the finite element analysis models of the antenna in different structure layout, and obtain the corresponding frequencies and model shapes. finally, according to the importance of each object, we set up the model of multiple objects that aims to maximize the first natural frequency and minimize the mass. combining orthogonal experiment and variant weighting coefficient method, we formed an effective multiple objects optimized algorithm basing on the neural network and genetic algorithm
本文首先詳細的敘述了天線結構的各組成單元，闡明了天線反射拋物面的形成原理；然後在ansys軟體環境中建立了不同結構布局下天線的有限元分析模型，分析計算了各種情況下天線的的固有頻率與振型；最後依據天線各指標的重要性，建立了以一階固有頻率最大、質量最小為目標的天線結構多目標優化設計模型，並基於神經網路和遺傳演算法，結合正交實驗和變加權系數技術，形成了一種有效的多目標優化演算法，在matlab平臺下實現了天線的結構多目標優化設計計算程序，求得了天線的最佳結構參數。Abstract : by comparing the channel capacities hetwem orthogonal space - time block coding and multi - antenna array system over rayleigh fading channel, some capacity loss for orthogonal space - time block coding is obtained, which is a function of the code rate, the rank of channel matrix and the number of transmitter and receive antennas, although the system of orthogonal space - time block codes is simple and easy to implemented. if is also shown that there is no capacity loss only if both the code rate and the channel matrix rank are all one
文摘:在研究瑞利衰落條件下正交空時分組編碼通道容量的基礎上，將其與多發送多接收天線系統的通道容量進行了比較.比較結果表明，正交空時分組碼雖編碼簡單，易於實現，但在通道容量方面存在較大的損失，損失的程度與編碼碼率、通道矩陣的秩及收發天線數等因素有關.進一步研究表明只有當編碼碼率和通道矩陣的秩都為1時，才沒有通道容量的損失The spot responder system which is the necessary part of ctcs is analyzed in the dissertation and three key technologies of the channel in the responder system are researched. firstly, a new kind of rectangular plate magnetic inductive loop antenna is designed to transmit the power frequency. researching the near field inter - inductive characters, the relationship among the inductive efficiency, the perimeter and the conductor width of the antenna is found out
本文在對ctcs中的點式應答器系統原理及組成進行分析和消化的基礎上，對系統中通道的幾個關鍵技術進行了詳盡的研究，主要分為三個方面: 1 ，提出並研製了新型的片式環形磁感應天線，並對傳輸能量載波的天線的近場互感特性進行了分析，得到互感效率隨天線的周長大小以及導帶寬度的變化規律，並通過計算機模擬和試驗對天線的近場波瓣圖進行了研究;通過分析寬帶匹配技術中的實頻法理論，設計了信號載波天線的寬帶匹配網路。Based on chinese tracking and data relay satellite ( ctdrs ) in the future, the antenna pointing control and complex control theory of user satellite are studied deeply in this dissertation, which is funded by the improve item of dept. of astronautic engineering and mechanics ? “ the teaching demonstration of antenna pointing control system in tdrss ”. the main contents of this dissertation are consisted of the following parts : firstly, dynamics equation is derived using lagrange equation for user satellite, so as the kinetics equations of user satellite at the same time are expressed in the form with matrix differential equations that is suitable for attitude control system design and analysis
本學位論文結合航空宇航科學與技術學科研究生教學基地實驗室建設項目「中繼系統星間鏈路天線指向控制系統教學與演示實驗」 ，以我國跟蹤與數據中繼衛星系統為背景，對某型號用戶星星間鏈路天線指向跟蹤控制和復合控制理論進行深入的研究，研究內容主要包括以下幾個方面: 1 .利用lagrange方程建立了用戶星的動力學方程，同時推導了運動學方程，並將這組動力學方程以矩陣微分方程形式表示，使之適用於姿態控制系統的設計和分析。Then its mathematical model is set up and its validity is proved by computer simulation results. in the following, a new processing method of using three - antenna to detect, locate and image moving target is proposed based on dpca and interferometric theory. this method can not only suppress ground clutter effectively and detect moving target but also locate accurately azimuth position of moving target and estimate its velocity
深入分析了dpca和干涉的原理后，提出一種沿航跡放置的三天線sar動目標檢測和成像方法，詳細描述了該方法的工作機理，給出系統組成框圖，並給出該方法進行動目標檢測、定位、測速和成像的步驟，然後給出了計算機模擬方案及大量的模擬結果，充分證明了採用該方法不僅能夠有效的抑制地雜波、檢測動目標，還能夠對動目標精確定位，準確估計出動目標的速度，對動目標重新聚焦成像。Then the solving procedures of these bies by the rwg functions based moment method are elaborated, and the method of modeling complex objects built of arbitrary line, surface and volume structures is developed. in order to solve realize antenna and circuit problems, methods of adding excitations and concentrated loadings with moment method are deceloped, and matrix pencil ( mp ) method is used to deembeded the s prameters of antennas and circuits from the computed current distribution. some numerical results of practical complex antenna and scattering problems are presented to illustrate the veracity and effectiveness of the method
在第一部分中，首先從電磁場的基本理論出發，基於等效原理和邊界條件以統一的方法建立了用於分析金屬、介質及金屬與介質混合結構的邊界積分方程，並歸納和比較了各類積分的適用范圍和優缺點;在此基礎上，給出了使用基於rwg函數的矩量法求解各種邊界積分方程的一般過程;研究了具有任意線、面、體組成的復雜結構的電磁建模方法，並給出了各種多面連接情況下基函數和未知量的選取方法;研究了使用矩量法分析電路、天線問題時集總元件和激勵源的處理方法，並基於矩陣束方法（ matrixpencilmethod ）提取了電路和天線問題的s參數;最後通過分析一些工程中的復雜金屬天線問題和具有「金屬與介質混合結構」的散射和天線問題驗證了方法的準確性和高效性。Similar to asama protocol, qasama protocol applies ppo and go algorithm, but qasama protocol also considers the requirements of packet delay, packet drop rate, bit error rate ( ber ), traffic capacity and channel utilization, and integrates these requirements into the slot allocation procedure
在qasama協議中，綜合考慮了分組時延，分組丟棄率，誤碼率，業務容量以及通道利用率方面的要求，並將這些要求與多波束智能天線的特點及自適應時隙分配過程有機地結合起來。Previous research on the ad hoc network almost aim at omnidirectional antenna of all receivers and transmitters, or as a default attribution. in my thesis, firstly i describe the advantages of the directional antenna at many aspects which including spatial division multiple access ( sdma ), the antenna gain, anti - interference etc. and analyze the possibility about the directional antenna used for the ad hoc networks, secondly i study its multiple access and routine protocols using the directional antenna. and compare the protocol difference and network " performance between omnidirectional and directional antenna in particular environment
首先闡述了定向天線在網路空分復用（ sdma ） 、天線增益、抗干擾等方面的的優勢，分析了定向天線用於移動自組網的可行性，接著重點研究了基於定向天線的多址接入協議和路由協議，分析了與全向天線在組網和協議實現中的異同點和優缺點，並對特定的環境下的網路性能作了對比。Above all, the study status and trends in development of rfid antenna are summarized in this thesis. the basic composition and operational principle of rfid system are discussed systematically as well as the division of the fields of antenna and the coupled modes of energy capacity. and the operating frequency and typical application of rfid are investigated to determine basic antenna structure
本文首先對rfid技術的研究和發展現狀進行了綜述，系統的闡述了rfid的基本組成和工作原理、天線場區的劃分、能量耦合的方式以及rfid的典型工作頻率與應用，並確定基本的天線形式。The wind loading of a tracking radar antenna, for example, results from a mean velocity component that varies with time plus superimposed random gusts
例如跟蹤雷達天線的風力負載是由一個隨時間變化的平均速度成分與迭加的隨機陣風組成的。After successful online submission, you will receive further e - mail confirmation and information ( including about facilitating a group ) within several days
在我們收到您的線上報名后，在數天內您會收到電子郵件確認報名與更多資訊（包含協助引導分組資訊） 。The cable is manufactured on argon arc welding, crrugating and slotting production lind with the most advanced technolongy byslotting the holes along outer conductor axis, so the evenly - distributed rdlatively strong radiating signal in the close vicinty lf the cable along ts axis make it possible signal transimission, across long distance in uncovered area
50歐姆漏泄同軸電纜系採用現今最先進的氬弧焊、軋紋和可多向開槽設備，切削一組合適的外導體槽孔，使電纜周圍沿信號傳輸方向具有強度相對均勻的射頻信號，實現信號在分立天線盲區的長距離輸送。分享友人