rank gradient 中文意思是什麼
rank gradient
解釋
煤級梯度-
Taking the measurement matrix rank 4 as the constraint, we propose two methods to estimate projective depths iteratively : ( l ) the algorithm of estimating projective depths based on conjugate gradient method ; ( 2 ) the algorithm of estimating projective depths based on genetic algorithms
以測量矩陣的秩為4作為約束，以仿射投影逼近透視投影，提出了以下迭代估計射影深度的演算法：基於共軛梯度法的射影深度估計演算法，基於遺傳演算法的射影深度估計演算法。 -
Firstly, the principle of phase gradient autofocus and rank one phase estimate and its advanced are detailed. secondly, it proposes an algorithm of fast maximum contrast phase compensation after discussing its similar algorithm fast minimum entropy phase compensation
討論了經典的相位梯度自聚焦演算法、秩一相位誤差演算法及其改進形式;在討論快速最小熵相位補償演算法的基礎上，提出了對比度最優相位調整演算法，實測數據處理表明了該演算法的有效性。 -
Phase gradient auto - focus algorithm ( pga ) and rank one phase estimation auto - focus algorithm ( rope ) satisfying high - resolution air - borne sar image formation needs are analyzed. aimed at disadvantages of pga and rope algorithms, improved rank one phase estimation auto - focus algorithm ( irope ) is introduced. at last, combining fsa and irope algorithms, using air - borne sar actual flight data, the algorithms " feasibility and validity are validated
第三，針對相位誤差對圖像質量的影響進行了定性分析，同時對多普勒參數估計的必要性及其幾種演算法進行了討論；接著系統研究了適合於高解析度機載sar成像要求的相位梯度自聚焦演算法（ pga ）和秩一相位估計自聚焦演算法（ rope ） ，並針對pga和rope演算法的不足之處，介紹了改進的秩一相位估計自聚焦演算法（ irope ） ；最後，結合fsa成像演算法和irope自聚焦演算法，以機載sar實際飛行數據為基礎，對演算法的可行性和有效性進行驗證。
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