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一種基于方位譜重采樣的大斜視子孔徑SAR成像改進Omega-K算法

懷園園,  梁毅,  李震宇,  邢孟道

懷園園, 梁毅, 李震宇, 邢孟道. 一種基于方位譜重采樣的大斜視子孔徑SAR成像改進Omega-K算法[J]. 電子與信息學(xué)報, 2015, 37(7): 1743-1750. doi: 10.11999/JEIT141383
引用本文: 懷園園, 梁毅, 李震宇, 邢孟道. 一種基于方位譜重采樣的大斜視子孔徑SAR成像改進Omega-K算法[J]. 電子與信息學(xué)報, 2015, 37(7): 1743-1750. doi: 10.11999/JEIT141383
Huai Yuan-yuan, Liang Yi, Li Zhen-yu, Xing Meng-dao. Modified Omega-K Algorithm for Sub-aperture High Squint SAR Imaging Based on Azimuth Resampling[J]. Journal of Electronics & Information Technology, 2015, 37(7): 1743-1750. doi: 10.11999/JEIT141383
Citation: Huai Yuan-yuan, Liang Yi, Li Zhen-yu, Xing Meng-dao. Modified Omega-K Algorithm for Sub-aperture High Squint SAR Imaging Based on Azimuth Resampling[J]. Journal of Electronics & Information Technology, 2015, 37(7): 1743-1750. doi: 10.11999/JEIT141383

一種基于方位譜重采樣的大斜視子孔徑SAR成像改進Omega-K算法

doi: 10.11999/JEIT141383 cstr: 32379.14.JEIT141383
基金項目: 

國家自然科學(xué)青年基金(61101245)和中央高?；究蒲袠I(yè)務(wù)費專項資金(K5051302046)

Modified Omega-K Algorithm for Sub-aperture High Squint SAR Imaging Based on Azimuth Resampling

  • 摘要: 斜視SAR數(shù)據(jù)兩維波數(shù)域支撐區(qū)具有斜拉特性，并且斜視角越大，斜拉越明顯；在大斜視成像時，常規(guī)Omega-K成像直接選取矩形支撐區(qū)進行處理，支撐區(qū)利用率低，難以滿足成像分辨率要求。針對子孔徑大斜視SAR數(shù)據(jù)成像，該文提出一種基于方位譜重采樣的改進Omega-K算法。該算法通過坐標(biāo)軸旋轉(zhuǎn)，實現(xiàn)波數(shù)譜支撐區(qū)利用率的最大化，針對伴隨的方位空變問題，采用方位譜重采樣方法校正空變性，實現(xiàn)方位統(tǒng)一聚焦。另外，由于對于子孔徑數(shù)據(jù)處理，考慮位置支撐區(qū)受限，不同于傳統(tǒng)Omega-K方法，改進Omega-K算法在方位波數(shù)域成像，避免了位置域成像需要的大量補零操作，提高了處理效率。點目標(biāo)數(shù)據(jù)仿真和實測數(shù)據(jù)處理驗證了該文算法的有效性與實用性。
    Abstract: Due to the skew Region Of Support (ROS) of the two-dimensional wavenumber domain for high squint SAR data, conventional Omega-K algorithm can not exploit the ROS efficiently enough and degrades the resolution when choosing the square region to process. So a modified Omega-K algorithm is proposed in this paper to deal with the high squint SAR data for sub-aperture imaging. The maximum usage of ROS is obtained by the coordinate axis rotation. For the following azimuth dependence, the method of azimuth resampling is adopted to realize the uniform focusing. Compared with the traditional Omega-K method, the modified Omega-K algorithm is focused in azimuth wavenumber-domain because of the limitation of the azimuth sub-aperture ROS in order to avoid zero padding operation, and increase efficiency. Simulation results and raw data processing validate the effectiveness of the proposed algorithm.
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出版歷程
  • 收稿日期:  2014-10-29
  • 修回日期:  2015-02-06
  • 刊出日期:  2015-07-19

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