antenna aperture 中文意思是什麼

antenna aperture 解釋
天線孔徑
  • antenna : n. （pl. -nae , antennas）1. 【動物；動物學】觸角。2. 【無線電】天線〈英國常用 aerial〉。
  • aperture : n. 1. 孔，隙縫。2. （照相機的）光圈；孔徑，口徑。
  1. Research of mutual coupling of aperture - coupled microstrip antenna arrays

    口徑耦合微帶天線陣的互耦研究
  2. Every phased - array rader needs thousands of phase shifters, which control the phase of radiator elements in the antenna aperture surface to scan beams fast

    每部相控陣雷達需要上千個移相器，才能控制天線孔徑面上各輻射單元的相位變化進而實現快速掃描。
  3. Phase array radar can scan beams fast by controlling the phase of radiator elements in the antenna aperture surface, which shows many excellences such as agility, change celerity and multifunction. therefore, phase array radar is fit for the necessity of combat readiness

    這種雷達通過電的方式控制天線孔徑面上各輻射單元的相位變化，以實現波束的快速掃描，使其具有靈活、變化快速、多功能等優點，適應戰備需要。
  4. The influence of airborne sar antenna aperture on imaging process is analyzed

    摘要分析了機載合成孔徑雷達天線口徑對成像處理的影響。
  5. The parameters that influence the single photon acquisition probability are the transmitter ' s tracking - pointing error, the far - field divergence angle, the link distance between transmitter and receiver and the receiver ' s antenna aperture

    得到影響單光子捕獲概率的主要參量是發射機的跟瞄誤差、光束遠場發散角、發射機和接收機的鏈路距離和接收機天線孔徑。
  6. To improve this ability, a higher cross - range resolution is needed. an inverse synthetic aperture radar ( isar ) achieves high resolution in the cross - range dimension by taking advantage of the motion between radar and targets to synthesize the effect of a larger antenna aperture

    逆合成孔徑雷達（ inversesyntheticapertureradar ，簡稱isar ）信號處理對接收到的運動目標的回波信號進行相干處理，等價成一個大口徑天線，很大程度上提高了方位向距離分辨力。
  7. Abstract : according to the continuative condition of the tangential fields on the slot aperture which is the inclined narrow - slot on the broadwall of a sectoral waveguide, the moment method is used to calculate the magnetic current coefficient and distribution. then the scattering field, the scattering parameter and the equivalent impedance are obtained. leting only the te11 dominant mode propagates in the waveguide, the scattering parameters and the normalized equivalent series impedance in the x - band are computed. the basis disigned the slot antenna and the slot array is offered

    文摘:根據縫隙口面切向場的連續條件，採用解析數值法矩量法，對扇面波導寬壁上窄的斜縫進行了計算，解得了磁流系數及其分佈，並得到散射場、等效散射參量及等效阻抗等重要參數.假定波導中僅有te11主模傳輸，在x波段計算了散射參量和歸一化等效串聯阻抗，給出計算結果，為縫隙天線和縫隙陣列設計提供了依據
  8. Based on the doppler effect and pulse coherence technique, synthetic aperture radar ( sar ) breaks through the azimuth resolution limitation imposed by real aperture antenna. in combination with the pulse compression technique, two - dimensional high resolution imagery to distant targets can be realized

    合成孔徑雷達（ sar ）利用以多普勒頻移理論和脈沖相參為基礎的合成孔徑技術，突破了實孔徑天線對方位向分辨力的限制，與脈沖壓縮技術相結合，實現了遠距離目標的二維高分辨成像。
  9. Chapter 4 proposes two false target jamming detection schemes by dual - aperture antenna along - track and cross - track interferometric sar, which are based on moving target detection technique and spatial cancellation algorithm

    第四章將動目標檢測技術和空域對消技術引入到對干擾目標的檢測中，提出了沿航跡和跨航跡雙天線干涉對消檢測虛假圖像欺騙干擾的方法。
  10. While carrying out the scheme, at first, the basic theory of antenna, array antenna and electromagnetic absorption, the performance parameter of antenna and parabolic antenna are deeply researched. in conformity, the characteristic and calculation of aperture field and near - to - far - field transformation for radiation pattern are detailed analyzed. second, the factors such as, the amount of the antenna elements, mutual coupling between each element, ground and the buildings on earth ' s surface, which affect the performance of array antennas ’ resultant field are stressed discussed

    在系統實現過程中，課題首先從天線、陣列天線，以及電磁場計算方法的基本理論著手，分析了天線與拋物面天線的各項性能參數，以及天線的口面場和近-遠區輻射場的特點和計算;進而，更加深入的討論和研究影響天線陣列合成場強的各項因素，包括系統所使用的天線單元個數對陣列合成場的影響、天線單元之間由於互耦造成的影響、傳播過程中地面和/或地面建築物的影響等。
  11. In airborne synthetic aperture radar ( sar ), antenna stabilization platform is used to isolate antenna pointing, which is stabilized through controlling the platform axis ' rotation, from the vehicle ' s varying attitude and dynamical vibration

    摘要機載合成孔徑雷達中，天線穩定平臺用於隔離載機的姿態變化和機械振動對天線指向的影響，並通過伺服系統控制平臺支承軸的轉動穩定波束指向。
  12. Research on the radiation pulse width of the aperture antenna

    口徑天線輻射脈沖持續時間的研究
  13. " the project aims to build a fixed spherical reflective antenna of 500 metres aperture at a bowl - shaped valley of some 500 metres wide in a mountainous area in guizhou and this reflective antenna will be named as " soft antenna "

    。這研究項目計劃在貴州山區中的一個開口500多米的碗狀山谷中，依附地形建造一口徑為500米的球面反射面固定天線，名為柔性的天線。
  14. The conformal microstrip antenna with some unique character has been applied in many fields, especialy on speedy objects. in this paper, an efficient fdtd algorithm is introduced to analyse the microstrip antenna. firstly, the fdtd formula in descartes coordinate system and in cylindrical coordinate system are obtained from the time _ dependent maxwell equations using the yee algorithm in a calculating region where the dielectric parameters are independent of time and space. the choice of the space discretization units and the time discretization interval are discussed which are decided by the accuracy and stability respectively. the shape and setup of the excitation source are discussed too. the excitation source is chosen to be gaussian pulse in shape. secondly, the mur ' s first - order and second - order boundary condition are deduced in cylindrical coordinate system. the methods of transforming radiation fields from near zone to far zone in the frequency domain and in the time domain are presented when fdtd is applied to analyse the characteristics of far zone. finally, three kinds of microstrip antennas are analysed. they are a slot antenna that lies on a plane ground of a microstrip, a slot antenna that lies on a cylindrical ground of a microstrip and a microstrip line _ fed aperture coupled stacked rectangular patch antenna in cylindrical coordinate system

    本文從麥克斯韋旋度方程出發，建立了笛卡兒坐標下無源空間中均勻無耗媒質的fdtd基本方程和圓柱坐標下無源空間中均勻無耗媒質的fdtd基本方程，詳細討論了fdtd法計算中時間步長和空間步長的選取原則以及激勵源的類型和設置；推導了mur一階和二階邊界條件在圓柱坐標下的差分格式；給出了在用fdtd法計算天線的遠場輻射特性時必需採用的頻域和時域近場遠場變換技術；最後用fdtd法計算了平面微帶縫隙天線、柱面共形微帶縫隙天線和柱面共形微帶層疊天線的輸入阻抗和遠區輻射場，並分析了天線的一些參數的變化對天線輸入阻抗的影響，得出了一些有用的結論。
  15. Firstly, the theory of microstrip antenna is simply analyzed. based on the research of it, the best feeding way which is aperture coupled feeding is found. at the same time, the round patch is chosen

    本文首先對微帶天線的理論進行了簡要分析，通過對微帶天線理論的研究，找出了天線最優化饋電方式? ?口徑耦合饋電;同時，也選出了天線所採用的貼片形狀? ?圓形。
  16. Dual - polarization aperture - coupled microstrip element and array antenna with high isolation

    高隔離度的雙極化口徑耦合微帶單元與陣列天線
  17. 4. the motion compensation problem, which is one of the important problems in synthetic aperture radar is discussed in this paper, the method to install three accelerometers in the center of the antenna is discussed in detail

    （四）討論sar運動補償的問題，這是合成孔徑雷達研究中的一個主要問題，本文主要論證了將三個加速度計安裝于天線相位中心處的方案。
  18. Spotlight synthetic aperture radar can efficiently obtain an image with very high azimuth resolution, since its antenna illuminate the fixed target on the ground. bistatic radar is not a new concept and its fundamental principles have been known and demonstrated many years before the development of operational monostatic radar

    由於其天線波束始終照射同一目標場景，因此可獲得更大的方位多普勒帶寬和更高的方位分辨力，但實際上由於受數據處理條件、載體運動誤差等因素的影響，方位解析度的提高是有限的。
  19. Aperture synthesis uses interferometry technique to improve the limitations set by antenna physical aperture while working at lower frequency. phase and amplitude calibration of the visibility samples must be carried out to compensate for system bias before measurement

    綜合孔徑技術利用了以小口徑天線陣列合成大的觀測口徑的技術，解決了在較低頻率時天線物理口徑要足夠大才能得到期望的空間解析度的嚴重缺陷。
  20. A two - dimensional microwave imaging system in x band with stepped frequency signal and real aperture antenna is established. two - dimensional super - resolution algorithm is applied in this system

    本文圍繞實孔徑微波成像系統，在提高系統的角度解析度、二維超分辨處理和基於強散射中心分佈的rcs數據壓縮等方面進行了研究。
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