itu-r 中文意思是什麼

itu-r 解釋
國際電聯無線電部門
  • itu : ITU ＝International Telecommunication Union （聯合國）國際電信聯盟。
  • r : 1 〈拉丁語〉 recipe 【醫學】處方。2 radical 3 Reaumur 4 〈拉丁語〉 Rex Regina 5 radius 6 ratio 7 ...
  1. Itu - r international telecommunications union - radio communications sector

    國際電聯無線電部門
  2. Using the dsd models and forward scattering amplitude computed by the least squares fitting method, the specific attenuations at l - 400ghz have been computed and analyzed, the parameters of " power law " relation between specific attenuation and rainfall rate are obtained. the specific attenuations in qingdao, guangzhou and xinxiang are compared with itu - r specific rain attenuation models

    利用平均雨滴尺寸分佈和點匹配法計算的雨滴的前向散射數據計算和分析了青島、廣州和新鄉地區1 ? 400ghz特徵雨衰減特性，得到了特徵雨衰減與降雨率的指數關系參數，並與itu - r （ internationaltelecommunicationunion - radiocommunication ）特徵雨衰減模式進行了系統的比較研究。
  3. The analytic specific attenuation model for rain for use in prediction methods are developed, the specific rain attenuations calculated by the analytic model are in high agreement with those by the parameters tabulated in itu - r model, this model has presented to itu - r as a proposed revision to current itu - r model

    基於itu - r特徵雨衰減模式的列表參數，提出了特徵雨衰減的解析模式，該模式計算的特徵雨衰減與itu - r模式列表參數計算結果間有很好的一致性，並提交itu - r作為國際標準審議。
  4. Attendance at meetings of itu - r 6th sg and its wps in march

    2001年3月國際電聯第六研究組及其工作組會議情況
  5. The system generates 18 kinds of worldwide used hdtv test pattern signals supported by smpte 274m standard, and also provides ypbpr, rgb video outputs both in digit and analog and the output interfaces of itu - r bt. 1120 - 2 / gy / t157 - 2000 studio hdtv digital video signal interface standard

    該系統生成了符合smpte274m國際標準的18種普遍採用的hdtv測試圖案信號。它提供ypbpr 、 rgb兩種視頻數字輸出與模擬輸出，其介面符合itu - rbt . 1120 - 2 / gy / t157 - 2000演播室高清晰度數字視頻信號介面標準。
  6. According to the theory of optical wave propagation in the slant path and the itu - r turbulence structure constant model, which is altitude dependent and proposed in 2001, the modified rytov method is extended to be applied to study on the problems, which waves propagate in the slant path. the scintillation index as a function of the rytov variance is obtained from weak to strong fluctuation regions with plane wave and sphere wave incidence, respectively

    根據斜程傳輸理論和2001年提出的itu - r湍流大氣結構常數模型，將修正pytov方法推廣應用於斜程傳輸問題研究，得到了平面波和球面波斜程傳輸時的閃爍指數，分析了湍流內尺度、近地面風速等參量對閃爍指數的影響。
  7. H. 264 iso iec 14496 - 10 avc. itu - t sg16 q. 6 vceg and iso iec jtc 1 sc 29 wg 11 mpeg, jvt - g050r1, may 2003, pattaya. 3 li r, zeng b, liou m l. a new three - step search algorithm for block motion estimation

    為了降低運動估計的復雜度，研究者們已經提出了很多方法，例如三步搜索演算法，基於塊的梯度下降演算法，鉆石型搜索演算法，六邊形搜索演算法，這些演算法都基於這樣一個假設:離起始搜索點越近，越有可能搜索到最佳運動矢量。
  8. Dect is a kind of digital cordless telecommunication technique that was developed by etsi in 1992 and was brought to the standard by itu - r on nov 5, 1999

    Dect是etsi於1992年推出的稱為二代半的數字無繩通信標準，並且於1999年11月5日的赫爾辛基會議上被國際電聯itu - r納入3g標準。
  9. An atmosphere structure constant cn2 model, which varies with height, is presented based on itu - r amplitude scintillation model, existing itu - r optical cn2 model and meteorologic measurement relative humidity and temperature profile data, at 10 ~ 30ghz. the log - amplitude scintillation deviation calculated in terms of the cn2 model based on humidity and temperature vertical profile compare with values predicted by means of itu - r and ortgies model. it is emerged that the calculation results based on the cn2 model agree almost with prediction results by itu - r and ortgies model at 10 ~ 30ghz and there is an advantage that relative humidity and temperature varied with height has be considered in the cn2 model

    根據光波段的itu - rc _ n ~ 2模型， itu - r幅度閃爍標準偏差模型，和溫度和相對濕度隨高度變化的氣象數據，在10 30ghz ，分析得到了大氣結構常數c _ n ~ 2隨高度變化的模型；並根據溫度和濕度垂直分佈數據計算了對數幅度閃爍_ x ，還與itu - r和ortgies模型的預測結果進行了比較，結果表明，在10 30ghz ，用該c _ n ~ 2模型計算的結果和用itu - r及ortgies模型預測的值符合較好，且在用c _ n ~ 2模型計算時考慮了溫度和相對濕度隨高度變化關系。
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