對比度最優(yōu)自聚焦算法
Contrast optimization autofocus algorithm
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摘要: 該文研究了一種適用于SAR的自聚焦算法,稱作對比度最優(yōu)自聚焦算法(Contrast Optimiza-tion Autofocus Algorithm,COAA)。該算法是一種原理簡單、收斂快、計算量小、魯棒性強的自聚焦算法,該文著重研究了COAA的實現(xiàn)方法。通過計算機仿真模擬證明了該算法的有效性。將COAA運用于中關(guān)村地區(qū)L-SAR數(shù)據(jù)并得到了理想的圖像,這說明該算法具有重要的實際應用價值。最后,該文通過一些具體例子驗證了該算法與其他算法相比具有更強的魯棒性。
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關(guān)鍵詞:
- 合成孔徑雷達; 對比度最優(yōu)自聚焦算法; MAPDRIFT自聚焦算法
Abstract: To focus a synthetic-aperture radar image which suffers from phase errors, an autofocus algorithm, Contrast Optimization Autofocus Algorithm (COAA), is proposed. This algorithm is based on the optimization of the contrast function, which represents a measure of the focus degree of the image. The main steps of the COAA are described. Experimental results show that this algorithm is very efficient. The COAA has many advantages. The relative performances of COAA and another autofocus algorithm, MAPDRIFT autofocus algorithm, arc compared. -
W.G. Carrara, et al., Spotlight Synthetic Aperture Radar, Boston, London, Artech House. 1995,245-246.[2]F. Berizzi, G. Corsini, Autofocusing of inverse synthetic aperture radar images using contrast optimization, IEEE Trans. on Aerospace Electron. Syst, 1996, 32(3), 1185-1191.[3]張澄波,綜合孔徑雷達:原理、系統(tǒng)分析與應用,科學出版社,1989,55. -
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