| 摘要: |
| 针对低频合成孔径声纳系统中的侧摆运动误差，提出一种基于冗余阵元回波数据的运动误差补偿方法。该方法首先沿距离向对相邻重叠相位中心的数据求统计平均获得缠绕的平均相位误差，然后通过滑动累加得到解缠绕的相位误差，运用估计的相位误差就能实现多子阵合成孔径声纳回波数据的运动误差补偿。仿真结果表明，该方法能够准确地估计侧摆误差，估计偏差均小于0.002 m；误差补偿后能够取得与无误差情况基本一致的成像结果，极大地改善了目标聚焦质量，能满足低频合成孔径声纳系统的运动误差补偿要求。实测数据处理结果进一步验证了该方法的有效性。 |
| 关键词: 多子阵合成孔径声纳 冗余阵元 运动补偿 成像算法 |
| DOI： |
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| 基金项目:国家自然科学基金资助项目（61601473）；装备预研基金（9140C290401150C29132） |
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| Motion compensation of sway error for multireceiver synthetic aperture sonar system |
| ZHANG Xuebo,FANG Biao,YING Wenwei |
| () |
| Abstract: |
| Considering the sway error of the low frequency synthetic aperture sonar (SAS) system,this paper proposes a motion compensation method based on the echo data of redundant elements.The presented method firstly obtains the wrapped phase error via averaging the echo data of the overlapped phase centers between two successive pings in the range dimension.Then,the unwrapped phase error can be got through the sliding superposition.Based on the estimated phase error,the motion compensation for the echo data of the multireceiver SAS is carried out.The simulation results show that the presented method can accurately estimate the sway error.And the estimation deviation is smaller than 0.02 m.After compensating the motion error,the imaging results,which are mostly the same with the case of no motion error,are obtained.It greatly improves the target focusing performance and satisfies the need of the motion error compensation in the low frequency SAS system.The real data processing results further validate the efficiency of the presented method. |
| Key words: multireceiver synthetic aperture sonar(SAS) redundant element motion compensation imaging algorithm |
《电讯技术》编辑部 