基于双基模式的合成孔径声呐成像技术研究
Research on Synthetic Aperture Sonar Imaging Technology Based on Bistatic Model
Abstract
合成孔径声呐(SyntheticApertureSonar,简称SAS)起源于合成孔径雷达(SAR)领域,是一种新型的高分辨率水下探测设备。SAS利用小孔径基阵在方位向上的运动来合成虚拟大孔径,以获得方位向高分辨率。而收发分置模式的双基合成孔径声呐(BISAS)又具有获取信息丰富、抗干扰性强及隐蔽性高等技术优势,在军事和民用上有着广阔的发展前景。 由于声呐和雷达有颇多相似之处,SAR的一些技术也可应用于SAS领域。但是受水下复杂环境的影响,SAS相对于SAR面临了更大挑战。首先是水声信道的多途效应问题比空气中更严峻,表现为SAS成像中更严重的虚假目标;其次声呐运动稳定性比雷达要差,风浪、水流... Synthetic aperture sonar (SAS) originated in the field of synthetic aperture radar, is a new type of high-resolution underwater detection equipment. The basic principle of SAS is that a physical small array moves along the azimuth direction to synthesize a virtual large aperture and thus obtain high azimuth resolution. Moreover, with rich information, strong anti-interference and high concealment,...