| 多接收阵合成孔径声纳距离-多谱勒成像方法 |
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| 引用本文： | 张学波,代勋韬,方标.多接收阵合成孔径声纳距离-多谱勒成像方法[J].武汉大学学报(信息科学版),2019,44(11):1667-1673. |
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| 作者姓名： | 张学波 代勋韬 方标 |
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| 作者单位： | 1.水声对抗技术实验室, 广东 湛江, 524022 |
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| 基金项目： | 国家自然科学基金61601473装备预研基金9140C290401150C29132 |
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| 摘 要： | Loffeld双基公式将多接收阵合成孔径声纳的系统函数分解为准收发合置项和收发分置畸变项。针对该模型，在二维频域定量分析了相位误差，结果显示该方法能满足高分辨成像。在此基础上提出了一种新的成像方法，首先在二维频域通过距离向数据分块的方式补偿收发分置畸变相位中的距离空变项；然后，在二维时域对各接收阵元的数据进行顺序重排，以实现多阵元数据的收发合置转换；最后，采用距离-多谱勒算法对收发合置转换后的数据进行成像，便得到高分辨图像。仿真和实测数据处理结果验证了该方法的有效性。
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| 关 键 词： | 多接收阵合成孔径声纳 Loffeld双基公式 分块 距离-多谱勒算法 |
| 收稿时间： | 2018-06-12 |
A Range-Doppler Imaging Method for the Multireceiver Synthetic Aperture Sonar |
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| Institution: | 1.Laboratory of Underwater Acoustics Antagonizing, Zhanjiang 524022, China2.No. 10 Research Institute, China Electronics Technology Group Corporation, Chengdu 610036, China3.Naval Research Academy, Beijing 100841, China |
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| Abstract: | With Loffeld's bistatic formula (LBF), the transfer function of the multireceiver synthetic aperture sonar (SAS) can be decomposed into the quasi-monostatic term and bistatic deformation term. For this model, the phase error in the 2D frequency domain is quantitatively analyzed. The results indicate that this model can fully satisfy the imaging need with high performance. Based on that, a new imaging method is proposed. Firstly, the range variant term of bistatic deformation phase should be first compensated in the 2D frequency domain via the range-dependent sub-block processing. Subsequently, the monostatic SAS equivalent data can be obtained by rearranging the multireceiver data in order in the 2D time domain. Then, a range-Doppler (R-D) algorithm is exploited to process the monostatic SAS equivalent data. Finally, the processing results of simulated and real data validate the proposed method. |
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