finite-difference migration 中文意思是什麼

finite-difference migration 解釋
有限差分偏移疊加法
  • finite : adj. 有限的；【語法】限定的；【數學】有窮的，有盡的。n. 〈the finite〉 有限（性）； 〈集合詞〉有限物。adv. -ly ,-ness n.
  • difference : n. 1. 差異，差別。2. 不和，爭論。3. 【數學】差，差額。4. 【邏輯學】特殊性。vt. 〈罕用語〉區別，使有差別。
  • migration : n. 1. 移住，遷移；移動；徙動。2. （鳥）移棲，遷徙；（魚）洄遊；（植物）侵移。3. 移住者群，移棲群。4. 【化、物】原子移動；電離子的移動。
  1. In this paper the fourier finite - difference technique is used for migration of phased - array ground - penetrating radar real pgpr data in 2d media

    本文利用傅里葉有限差分法對相控陣探地雷達樣機採集的實測數據進行偏移歸位。
  2. Prestack migration is performed by reverse - time migration method based on maxwell ' s equations using time - domain finite - difference method

    疊前偏移用時間域有限差分求解麥克斯韋方程組的逆時偏移方法實現。
  3. This conversion is based on the analytic expression of sonic and elastic wave equation, and use the different wave field extrapolation, which is initially used in seismic migration and forward modeling. this paper introduces the easy and efficient finite - difference method to realize the conversion by comparing three different methods

    論文經過對三種常規波場延拓方法（ kirchhoff積分法、頻率波數域法和有限差分法）優缺點的比較，採用了簡單易用的有限差分方法來實現這種轉換。
  4. Compared with the conventional finite - difference method on the fixed grid - size rectangular grids, the new method can be more cost - effective in complex models. numerical tests for both seismic modeling and reverse - time migration are performed on various theoretical models and a physical experiment

    用該剖分方法得到的網格在各速度層內的空間步長是不同的，而全區域上的時間步長卻近於恆定，因此在復雜模型上，本文方法的計算效率要高於傳統的矩形網格差分方法。
  5. A new finite - difference method is developed for seismic modeling and reverse - time migration based upon the voronoi cell construction on irregular grids. curved velocity boundaries and irregular earth surface can be accurately represented using the irregular grid implementation. therefore the modeled and migrated results can be more accurate, and meanwhile, the efficiency is still preserved using an explicit finite - difference scheme

    本文的方法可以實現任意非規則網格上的顯式差分計算，因此該方法在保持了傳統的矩形網格差分演算法簡單、高效特點的同時，又能精確地描述彎曲界面和起伏地表，提高了有限差分地震模擬和偏移結果的精度。
  6. The migration results of the synthetic and ocean field datasets show that this method is correct and effective. several prestack depth migration methods are proposed and unified to the synthetic source record migration method. these methods include plane wave migration with fourier finite difference ( ffd ) extrapolator, maximum energy plane wave migration and prestack migration with phase encoding of areal shot records

    通過對本文提出的平面波傅立葉有限差分疊前深度偏移方法、最大能量面炮記錄疊前深度偏移方法和相位編碼面炮記錄疊前深度偏移方法的研究，試算和對比，提出了合成震源三原則，根據這些原則，提出了合成震源概念和合成震源記錄疊前深度偏移方法。
  7. Author, secondly, starts from the approximate expandness of square root operator, perform mathematical calculations for finite difference operator in frequency - space domain, fourier finite difference operator in mixing domain ( frequency - space and frequency - wavenumber domain ) and general screen operator in mixing domain, compare and discuss their precision of their wavefield, adaptability for lateral velocity variations, computation efficiency and stability. thirdly, author, applies the steady variational reference slowness rytov approximation general screen wavefield extrapolation operator ( vrselrf ) in frequency - wavenumber domain, to the prestack and poststack forward modeling and depth migration

    第二，從平方根運算元的近似展開出發對頻率?空間域的有限差分運算元、混合域（頻率?空間域；頻率?波數域）的fourier有限差分運算元、混合域的廣義屏運算元進行了推導並對其波場描述精度、對橫向變速的適應性、計算效率和穩定性進行了比較與評述。
  8. A hybrid migration method, named " fourier finite - difference migration ", is a post - stack depth migration scheme. the downward extrapolation operator is split into three operators : one operator is a phase - shift operator for a chosen constant background velocity, another operator is the well - known first - order correction term, and the third operator is a finite - difference operator for the varying of the velocity function. phase - shift downward extrapolation and finite - difference downward extrapolation preserves the advantage of phase - shift method and finite - difference method

    傅立葉有限差分（簡稱ffd ）偏移演算法是一種疊后深度偏移演算法，其向下延拓運算元是一種混合運算元，包括三項：一項是處理常速的相移運算元，一項是一階相移修正運算元，最後一項是類似45度方程的有限差分運算元，用來處理劇烈橫向變速。
  9. Secondly, three migration methods including kirchhoff integral, 15 ? finite difference and wave equation phase displacement are discussed with the steps of performing on computer

    （ 2 ）論文完成了對克希霍夫偏移、有限差分偏移和相位移偏移的理論和方法實現的研究。
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