Synthetic aperture sonar imaging based on auto-focusing method

Jia Xu, Xingzhou Jiang, Jinsong Tang, Cunhua Zhang
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Abstract

Based on detailed analysis of causes resulting in phase errors in synthetic aperture sonar (SAS), this paper points out that the primary factors to affect our developing SAS can be ascribed to the shifts of Doppler center ( f/sub dc/) and Doppler rate (f/sub r/) for the irregular motion of the underwater carrier. Successively f/sub dc/ and f/sub r/ estimating methods in the image field based on multi-look processing are analyzed, and it is proved that these approaches are the better selections for SAS in the presence of both range migrant and partial aperture. A compensating and imaging complete SAS systemic design based on auto-focusing method is provided together with a modified range-Doppler imaging algorithm and a refined compensating step based on the PGA algorithm, and it is proved that this design is effective by real lake trial results.
基于自动对焦方法的合成孔径声纳成像
在详细分析合成孔径声呐相位误差产生原因的基础上,指出影响我国研制合成孔径声呐相位误差的主要因素是水下载体的不规则运动引起的多普勒中心(f/sub dc/)和多普勒速率(f/sub r/)的偏移。分别分析了基于多视处理的图像场f/sub dc/和f/sub r/估计方法,证明了在距离偏移和部分孔径存在的情况下,这些方法是SAS的较好选择。提出了一种基于自动对焦方法的补偿成像完整的SAS系统设计方案,提出了改进的距离-多普勒成像算法和基于PGA算法的改进补偿步长,并通过实湖试验证明了该设计方案的有效性。
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