A Fast Back-Projection Algorithm for Multi-Receiver Synthetic Aperture Sonar
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摘要: 提出了一种内存共享环境下的多子阵合成孔径声纳后向投影快速算法。首先根据后向投影算法的特点设计二维动态数据结构,保存同距离向上的时延和补偿相位信息,省去时延的重复计算;然后在共享内存环境下,将远距离和近距离聚焦运算相结合,实现计算负载平衡;最后通过实测数据的成像试验验证了本文算法的正确性和高效性。Abstract: We proposed a fast back-projection algorithm for multi-receiver synthetic aperture sonar (SAS) in a shared memory environment. A two-dimensional dynamic data structure was used to keep the delay time and the compensation phase information was designed based on the characteristics of the back-projection algorithm, which helps to eliminate repeated delay time computation for the same range. In the shared memory environment, we combine the focusing operation for the near and far distance of the image scene to achieve a computation load balance. An imaging test performed on real SAS data confirms the proposed algorithm is accurate and efficient.
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Keywords:
- synthetic aperture sonar /
- back-projection /
- parallel computing /
- shared memory
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