phase center 中文意思是什麼

phase center 解釋
相位中心
  • phase : n 1 形勢，局面，狀態；階級。2 方面，側面。3 【天文學】（月等的）變相，盈虧；【物、天】相，周相，...
  • center : n vt vi 〈美國〉＝centre n 1 中心；中心點；圓心；中央；中樞，核心；中心人物；根源，起源。2 〈常C ...
  1. A study on synthetic aperture sonar movement compensation based on displaced phase center algorithm

    基於位移相位中心演算法的合成孔徑聲納運動補償研究
  2. The dissertation also discusses a kind of improving algorithm of dpca : adaptive displaced phase center antenna ( adpca ), indicate the adpca can be used in distributed space - borne sar

    5 .對dpca的改進技術（ adpca ）進行了探討。通過分析，說明了adpca技術在分散式星載sar系統中應用的可行性。
  3. The paper overviews the history of moving targets detection and imaging based on sar, the methods based on doppler filtering, doppler rate filtering, parameter estimation and multichannel sar imaging are discussed in detail. the paper focuses on the two methods used in spaceborne sar which are displaced phase center antenna and along - track interferometric

    論文回顧了合成孔徑雷達檢測與成像運動目標的發展歷史，詳細地論述了基於多普勒濾波、基於多普勒速率濾波、基於參數估計以及基於多通道sar的運動目標檢測與成像方法。
  4. 3. after studying deeply the multi - antenna sar mtdi based on displaced phase center antenna ( dpca ), a new double - antenna method is proposed which remedies the shortcomings of conventional ways. the method need n ' t meet the constraint condition that conventional ways must meet and can suppress ground clutter effectively and detect moving target

    針對常規dpca方法的缺點創新性的提出了一種新的雙天線動目標檢測方法，建立了該方法的檢測模型並對該方法進行了有效的驗證，該方法不合成孔什雷達動口標檢測和成像研必滿足常規方法所必須滿足的限制條件就能夠進行動目標檢測，提高了dpca的實用價值。
  5. This dissertation mainly researches the displaced phase center antenna ( dpca ) technique in the new system, and the contributions are calculated as following : 1. the doppler history is analyzed for the spaceborne bistatic sar, doppler center frequency and doppler fm rate computational methods are studied. summing up is done for the methods of moving target detection and imaging

    本文完成的主要工作有: 1 .分析慢速運動目標信號特徵以及運動目標對sar成像的影響（多普勒中心頻率，多普勒斜率以及距離徙動誤差） ，總結了目前sar運動目標檢測與成像的主要方法。
  6. Our treatment shows in the raman effect case, mnls solitons, the same as nls solitons, keeps its energy, initial center and initial phase unchanged. however, the raman effect, not the same as nls solitons. reduces its amplitude, widens its width and under the same conditions, the self - frequency shift of mnls soltions is closer to the result of numerical simulation. in the raman effect together with frequency filters case, mnls solitons, the same as nls solitons, keeps initial center and initial phase unchanged and bandwidth - limited frequency filters can make the mean frequency of mnls soltion stand a steady value at the red side of the initial mean frequency, i. e. suppress the self - frequency shift of mnls soltions. and that, the other physical parameters of mnls soltion last stand a steady value. however under the same conditions, the steady value of the mean frequency of mnls soltions is closer to the initial mean frequency and the result of numerical simulation

    有所不同的是， raman效應雖然不改變孤子能量，但會引起孤子峰值的下降和寬度變寬，且在同一條件下， mnls孤子微擾理論得到的自頻移比nls孤子微擾理論得到的更接近直接數值計算結果。有限帶寬的頻率濾波也不引起mnls孤子初始中心、初始位相的改變，選取適當的頻率濾波器參數值能使孤子的平均頻率穩定在初始平均頻率的紅側一穩定值，抑制了自頻移，而且孤子的各物理量最後都穩定在一穩定值，這些與nls孤子微擾理論都是類似的。有所不同的是，寬度為飛秒量級下， mnls孤子平均頻率的穩定值更接近初始平均頻率，更接近數值計算結果。
  7. Phase center error : 2 rotation antenna s phase center error 4mm

    相位中心： 2旋轉天線相位中心誤差4mm 3
  8. Phase center error : 2 rotation antenna s phase center error 2mm

    相位中心： 2旋轉天線相位中心誤差2mm 3
  9. Moreover, the fish antenna is often used in the detection system. the variable phase center of the antenna is calculated which contain vertical polarization and horizontal polarization

    另外，本文對在偵收站中常用的魚骨天線在水平極化和垂直極化兩種狀態下的可變相位中心作了深入地研究。
  10. The circular monopole ultra - wideband antenna has not only the extremely wide band in frequency domain, but also stable phase center, which makes the antenna radiate and receive the short pulse signals without any distortion, and suitable for various ultra - wideband communication systems or the single antenna of other multi - frequency operating communication systems

    這種天線不僅具有極寬的阻抗帶寬，還擁有穩定的相位中心。這使得圓盤單極超寬帶天線可以不失真地收發時域短脈沖信號。所以該天線不僅適用於超寬帶通信中，還能夠作為復雜多頻工作系統的單一收發天線。
  11. The mathematical expression, which is used to calculate the variable phase center based on the mom, is derived first in the paper. it is proved that the variable phase center of the lpda is not superposition in the e - plane and the h - plane

    文中採用矩量法，首次導出了基於矩量法多分段計算可變相位中心的表達式，證明了偵測合一系統中常用的對數周期偶子天線（ lpda ）在e面和h面的可變相位中心不重合。
  12. Firstly, the differences between the ultra - wideband antenna and conventional wideband antenna are introduced in this thesis, and the definitions of several performance parameters of the ultra - wideband antenna are presented, among which the phase center and the group delay time are primarily discussed in that they describe the time domain properties of the antenna

    首先，簡要介紹了超寬帶天線與傳統超寬帶天線的區別，給出了超寬帶天線的性能參數在時域的描述方法。著重介紹了描述超寬帶天線時域特性的兩個參數，即相位中心和群延時。
  13. According to the characteristics of the high precise gps deformation monitoring, basing on the first period observation results of the monitoring network, the similar single - difference model of solving gps monitor point deformation information at single epoch is built, and the receivers ' antenna phase center offsets are discussed

    摘要根據高精度gps變形監測的特點，以監測網的首期觀測成果為基礎，建立了單歷元解算監測點變形量的似單差模型，討論了接收機天線相位中心偏差的改正方法。
  14. In field gps work, errors of receiver ' s antenna phase center and instrument height measurement are inevitable, so in this paper the influence of the error of instrument height measurement on planar coordinates is studied and it is proved theoretically that the influence of the error of instrument height measurement on planar coordinates can be neglected ; 3

    在gps實際作業中，接收機天線相位中心偏差和儀器高的量測誤差都是不可避免的。基於此原因，本文研究了儀器高量測誤差對平面坐標的影響，並從理論上證明了儀器高量測誤差對平面坐標的影響可忽略不計； 3
  15. The result demonstrates that the variable phase center of fish antenna is much more steady than the lpda in the main beam

    計算結果表明魚骨天線在主波束相當寬的范圍內，其可變相位中心的穩定度要優于對數周期偶極子天線。
  16. Design of microstrip antenna with stable phase center

    一種相位中心穩定的微帶天線設計
  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. In this paper, the variable phase center is calculated in the full space for the first time. the condition under which a linear array has a variable phase center in the full space is derived in the paper. it is concluded that the non - similar array has not variable phase center in the full space, but it has variable phase center in the e - plane and h - plane independently

    本文首次將相位中心擴展到全空間中進行計算，導出了直線陣列在全空間中存在可變相位中心的條件，得出了由非相似單元組成的線陣列在全空間並非處處存在可變相位中心，但在e面和h面獨立存在各自的可變相位中心這一重要結論。
  20. As a result, the ultra - wideband antenna must be able to radiate and receive the short pulse signals without distortion, in other words, the ultra - wideband antenna has to own several octave impedance bandwidth or more, and stable phase center, which enables the ultra - wideband antenna to transmit and receive short pulse signals without distortion

    這就要求超寬帶天線具有輻射和接收時域短脈沖信號的能力，即擁有幾個甚至十幾個倍頻程的阻抗帶寬，同時天線應具有穩定的相位中心以保證不失真地收發短脈沖信號。
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