directional antenna 中文意思是什麼

directional antenna 解釋
定向天線。

  • directional : adj. 1. 方向的。2. 【無線電】指向的，定向的。
  • antenna : n. （pl. -nae , antennas）1. 【動物；動物學】觸角。2. 【無線電】天線〈英國常用 aerial〉。
  1. An array of wave probes can be used as a directional antenna.

    排成陣列的測波儀，可作為波浪傳播方向的感觸器。
  2. Broadside directional antenna

    垂射天線
  3. In radiocommunications, the radiation in a lobe of a directional antenna

    在無線通信技術中，定向天線以某一波瓣輻射的電磁能。
  4. Most of the former ad hoc network mac protocols were designed for omni - directional antenna systems

    以前關于adhoc網路mac層的協議都是針對全向天線所設計的。
  5. Applying an active vibration control method for the reduction of the lateral vibration of directional antenna is investigated

    摘要本文提出以電流回授主動振動控制方式，抑制指向性天線之側向振動。
  6. A radio receiver and directional antenna used as a system to determine the angular direction of incoming radio signals

    無線方向探測器一種無線電接收和指向天線系統，用來確定收到的無線電信號的角方向
  7. Real geek types have been known to cruise around silicon valley with a laptop and directional antenna, trying to pick up networks

    真正的電腦怪傑帶著便攜式電腦和定向天線在矽谷附近游蕩，試圖接入網路。
  8. Mattias lampe, ronghong jin, junping geng, xianguang guo : invention patent “ one kind of directional / omni - directional antenna ” ( submitted )

    丁敏，金榮洪，楊熹，耿軍平，勞佳，吳琦：發明專利「甚高頻超寬帶天線設計」 （已提交） 。
  9. In actual fact, a suitably modified amateur radio transmitter operating in either the 420 to 450 megahertz band or the 1. 3 gigahertz band, with a highly directional antenna, is capable of transmitting voice to skull signals at less cost than the price of an automobile

    事實上，一個適當限制在420到450兆赫波段或1 . 3千兆赫波段的帶有高度定向天線的業余無線電廣播發射機，能夠把聲音信號傳給頭骨並且所花的費用比一輛汽車的價格還要少。
  10. Angular calibration of radar antenna system is composed of the calibration of angular error sensitivities ( also called directional sensitivity ), adjustment of cross - coupling of azimuth and elevation signals, and the calibrations of system errors such as antenna axial system error, dynamic delay and so on

    雷達系統天線的角度標校包括對系統角誤差靈敏度（又稱定向靈敏度）的標定、方位俯仰信號交叉耦合的調整以及對天線軸系誤差、動態滯后等系統誤差的標定。
  11. Smart antenna has been widely researched in communication and signal processing, the adaptive beamforming algorithm is the key technique of smart antenna. it could adaptively steer the array directional pattern to form the main narrow beams with high gain in the direction of the users " signals while deeply nulling the interference signals. it is an effective way to realize the optimal receiving of the interesting signals

    智能天線技術是目前通信和信號處理等領域的研究熱點，自適應波束形成演算法的研究是智能天線的一個關鍵技術，它能夠自適應地控制天線陣方向圖在用戶信號方向產生高增益窄波束，在干擾信號方向產生較深的零陷，是實現用戶信號最佳接收的有效方法。
  12. The paper includes four sections followed here : the first section studies the modeling of signals of pulse doppler radar seeker, and establishes a radar signal simulation model, including radar emitting signal model, receiving signal model, receiving echo signal model, clutter model, noise model, sum channel directional pattern of antenna model, difference channel directional pattern of antenna model, sheltering model, rcs model, glint noise model, etc. the second section studies signal processing of pulse doppler radar seeker, and establishes radar signal processing mathematical model and data processing mathematical model for simulation, including windowing, doppler filtering, envelope demodulation, pdi, cfar, centering, velocity tracking, angle tracking, a - b filtering, etc. the third section studies the modeling of modified proportion guiding, and establishes guiding model, then dynamic simulation results is provided

    論文的主要工作包括四部分：第一部分研究了脈沖多普勒雷達導引頭的信號建模問題，建立了雷達信號模型，主要包括：發射信號模型、接收信號模型、目標回波信號模型、雜波模型、噪聲模型、和差通道天線方向圖模型、遮擋因子模型、接收機噪聲模型、目標雷達截面積統計性模型、目標角閃爍模型等。第二部分研究了脈沖多普勒雷達導引頭的信號處理模式，建立了信號和數據處理模型，主要包括：加窗和多普勒濾波、包絡檢波、檢波后積累、頻域cfar處理、速度定心、速度跟蹤、角跟蹤、 ?濾波等，然後給出了信號處理流程。
  13. Digital signal processing technologies were used to produce spatial and directional beam in adaptive antenna. then the main beam aims at the coming direction of desired signal and the side lobe points to the coming direction of interference signals

    自適應天線利用數字信號處理技術，產生空間定向波束，使天線主波束對準期望信號到達方向，旁瓣或零陷對準干擾信號到達方向。
  14. Making use of the propagation property of the electromagnetic wave, the authors made a further discussion on the directional characteristics of the radiation electromagnetic waves from elements antenna, symmetric whip and antenna array, and analysed the effects of various factors on the directional characteristics

    摘要利用電磁波的傳播特點，對元天線、對稱振子及其天線陣輻射電磁波的方向性做進一步的探討，並分析各因素對其輻射方向性的影響。
  15. The directional routing protocol ds _ dsr put forward by the author is the improvement of the current protocol dsr, complete routine discovery and maintenance by directional neighbor nodes routing table, source routing and directional steering. the research discovers the application of the directional antenna, compare the omnidirectional antenna can increases the networks " total throughput, obviously reduces the co _ channel interference ( cci ), multiple access interference ( mai ), enlarges the nodes " signal and interference to noise ratio ( sinr ), and because of the high gain of directional antenna can realize the communication with farther distance and less jump, end to end delay can decrease deeply, simultaneously, security of networks can be improved partially, the node energy also can be saved easily by power control

    本文提出的定向路由協議ds _ dsr是基於對現有協議dsr的改進下實現的，通過定向鄰節點路由表、定向源路由和定向搜索來完成路由發現與維護。研究發現，定向天線的應用，相比全向天線可明顯提高網路的總的吞吐量，減少通道干擾、多址干擾，提高信干噪比，且由於定向天線的高增益可實現較遠距離、較少跳數的通信，減少了路由發現時間，這樣大大減小了傳輸時延，網路的整體性能得到了不同程度的提高，同時部分地解決安全問題，通過功率控制還可較容易的實現節能的目的。
  16. For the sake of the convenient network simulation, i select a same framework in my mac and routine protocols " simulation, that is ieee802. 11 standard built in soft tool opnet, by designing my network node model and directional antenna model, and the improvement of the current protocols, i realizes the evaluation of my special networks

    為了方便網路協議性能模擬，使移動自組網的接入協議和路由協議能夠在同一個模板上實現，本文在模擬平臺opnet設計了ieee802 . 11框架下的移動自組網節點模型和定向天線模型等，並通過對現有協議的改進，實現了特定網路性能的計算機模擬。
  17. This paper is worked to solve the phase center of the directional antenna, accordingly to giving some references for the interception and direction - finding system

    本文是為了解決定向天線的相位中心問題，為偵測合一系統設計提供參考而展開研究的。
  18. In the interception and direction - finding system, the phase center of the antenna is very important to the direction - finding, however, the phase center of directional antenna is few studied in the home and overseas

    在偵測合一系統中，天線系統的相位中心對于系統測向有著至關重要的作用，但是目前國內外對于定向天線的相位中心研究的非常少。
  19. 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。
  20. Mattias lampe, ronghong jin, junping geng, min ding : invention patent “ one kind of directional / omni - directional antenna with rf switching control circuit ”, ( submitted )

    金榮洪，耿軍平，周旭竹：實用新型專利「可實現極化兼容的小型全向天線」 （已提交） 。
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