| 适用于非匀速直线航迹的FFBP算法在SAS中的应用 |
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| 引用本文： | 段江涛,黄勇,刘纪元.适用于非匀速直线航迹的FFBP算法在SAS中的应用[J].应用声学,2017,36(1):67-72. |
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| 作者姓名： | 段江涛 黄勇 刘纪元 |
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| 作者单位： | 中科院声学研究所,中科院声学研究所,中科院声学研究所 |
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| 摘 要： | 时域的快速因式分解后向投影(FFBP)算法便于进行运动补偿,能够更好地适应方位向速度的不均匀和非直线航迹。本文探讨了在合成孔径声呐(SAS)系统中采用FFBP算法针对有一定起伏的非匀速直线航迹成像时的解决方法,参考方位向的速度信息进行非均匀的孔径合并策略,同时在利用相位中心重叠法(DPC)估计出声呐基阵对所规划航迹的左右侧移量后,用最小二乘准则拟合出一条理想的直线航迹并将FFBP算法处理中的初级子图像的原点补偿至此直线。实际海试数据处理结果证明了所提出的方法能够以较好的性能进行成像。
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| 关 键 词： | 合成孔径声呐 快速因式分解后向投影 运动补偿 非直线航迹 |
| 收稿时间： | 2016/3/25 0:00:00 |
| 修稿时间： | 2016/12/26 0:00:00 |
Application of FFBP algorithm to SAS imaging in non-linear trajectory with non-uniform speeds |
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| Duan Jiangtao,Huang Yong and Liu Jiyuan.Application of FFBP algorithm to SAS imaging in non-linear trajectory with non-uniform speeds[J].Applied Acoustics,2017,36(1):67-72. |
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| Authors: | Duan Jiangtao Huang Yong and Liu Jiyuan |
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| Institution: | Institute of Acoustics, Chinese Academy of Sciences,Institute of Acoustics, Chinese Academy of Sciences,Institute of Acoustics, Chinese Academy of Sciences |
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| Abstract: | Fast factorized back projection(FFBP) algorithm has the advantage of motion compensation and can adapt the non-uniform speeds on azimuth direction and non-linear trajectory. This paper proposes a FFBP imaging algorithm which uses a non-uniform sub-aperture combination strategy and approximates the trajectory to a straight line with displaced phase center (DPC) sway estimation and the least-square (LS) fitting. The method is applied to an experimental dataset of a seafloor target and the results show that the target could be imaged correctly with good performance. |
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| Keywords: | Synthetic Aperture Sonar (SAS) Fast Factorized Back Projection (FFBP) Motion Compensation non-linear trajectory |
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