結(jié)合運(yùn)動(dòng)補(bǔ)償?shù)牟〝?shù)域算法
A Wavenumber Domain Algorithm Integrating with the Motion Compensation
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摘要: 波數(shù)域算法(簡稱-k算法)可以很好地解決距離向和方位向的耦合問題，從而有能力處理寬波束SAR數(shù)據(jù)。由于傳統(tǒng)的-k算法無法跟運(yùn)動(dòng)補(bǔ)償方法結(jié)合起來，導(dǎo)致圖像效果往往比較差。該文對(duì)傳統(tǒng)-k算法進(jìn)行了一些改進(jìn)，通過反卷積的辦法將距離徙動(dòng)校正和方位壓縮處理分開進(jìn)行，并將子孔徑和自聚焦辦法運(yùn)用到-k算法中去，從而使-k算法更具有實(shí)用性。最后用改進(jìn)的-k算法對(duì)P波段寬波束SAR的實(shí)測(cè)數(shù)據(jù)進(jìn)行處理，圖像質(zhì)量明顯提高。
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關(guān)鍵詞:
- -k算法; 反卷積; 子孔徑; 自聚焦
Abstract: The wavenumber domain algorithm (ur-k algorithm for short) has the ability to process wide-beam SAR data because it has the ability to handle the range-azimuth coupling correctly. However, because the traditional nj-k algorithm can not integrate with the motion compensation approach, it sometimes results in bad image. Some improvement of the traditional ra-k algorithm is presented in this paper, that is, the deconvolution is used to separate the range migration correction from the azimuth compression, and then the sub-aperture and autofocus approach are applied to the ro-k algorithm, which makes the improved nj-k algorithm more practicable. At the end of this paper, a set of P-band wide-beam SAR data is processed by the improved tn-k algorithm, and the resultant image quality is obviously increased. -
Cafforio C, Prati C, Rocca F. SAR data focusing using seismic migration techniques[J].IEEE Trans. on Aerospace and Electronic Systems.1991, 27(2):194-207[2]邢孟道.基于實(shí)測(cè)數(shù)據(jù)的雷達(dá)成像方法研究.[博士論文],西安:西安電子科技大學(xué),2002年3月.[3]張澄波,綜合孔徑雷達(dá)原理、系統(tǒng)分析與應(yīng)用.北京:北京科學(xué)出版社,1989年,第四章第1節(jié).[4]Mehrdad Soumekh. Synthetic Aperture Radar Signal Processing with MATLAB Algorithms.[J].New York: John Wiley Sons.1999,:-[5]Cumming I G.[J].Neo Y L, Wong F H. Interpretations of the omega-k algorithm and comparisons with other algorithm.IGARSS03, Toulouse, France.2003,:-[6]劉永坦.雷達(dá)成像技術(shù).哈爾濱:哈爾濱工業(yè)大學(xué)出版社,2003:47-49. -
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