near field length 中文意思是什麼
near field length
解釋
近場長度-
In the first part of paper, we introduce the appliance of doppler weather radar in meteorological work in the near future, and simply enumerate all kinds of adjoint methods to retrieve data of radar. in the second part of paper, we choice some methods that are usually used domestically and overseas, compare excellence and flaw of the methods by using data of simulate wind field, analyze synthetically the precision of simulate result, the length of retrieval time and the structure of data distributing, lastly decide to regard ameliorated quasi - 4d adjoint method as retrieval technology in the paper. in the third part of paper, we retrieve the data of single doppler weather radar in hefei, anhui province, then calculate 3d wind field, streamline field, divergence, vorticity, helicity, moisture flux, divergence of moisture flux and potential vorticity from the result of retrieval
文中第一部分對近年來多普勒天氣雷達在氣象工作中的應用作了介紹，同時簡單的羅列了反演雷達資料的各種變分方法；接下來在第二部分選取了幾種國內外常用的反演方法，利用模擬的風場資料比較各種方法的優缺點，從模擬結果的精度、反演時間的長短、資料的分佈結構上綜合分析，最後決定將已做改進的準四維變分分析方法作為本文的反演工具；第三部分就是反演安徽合肥多普勒天氣雷達資料，然後由反演得出的風場計算了各個時間各個層次的三維風速、流場、散度、渦度、螺旋度、水汽通量、水汽通量散度和位渦。
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