A Squint Multi-aperture Chirp Scaling Algorithm for the Multi-aperture SAS with Small Squint Angle

2nd International Symposium on Resource Exploration and Environmental Science

生态环境科学

Wu, Haoran^1 ; Tang, Jinsong^1 ; Tong, Yishuo^1

Naval University of Engineering, Wuhan

430033, China^1

关键词: Chirp Scaling algorithm;    Delay compensation;    Imaging algorithm;    Multi aperture;    Phase compensation;    Reference range;    Squint angles;    Synthetic aperture sonar (SAS);   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/170/2/022113/pdf
DOI  :  10.1088/1755-1315/170/2/022113

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Squint multi-aperture synthetic aperture sonar (SAS) data is more challenging to process than data about its common side-looking counterpart because the geometry is complicated. While traditional multi-aperture algorithms mainly handle general side-looking cases, they do not work well for squint cases. In this paper, a squint multi-aperture chirp scaling algorithm (SMACSA) is proposed that is suited to process multi-aperture SAS data with small squint angle. In the derivation of the imaging algorithm, the squint multi-aperture signal is converted into the squint monostatic signal by the phase compensation factor of range dependent and the delay compensation factor on reference range, then the multi-aperture chirp scaling algorithm (SMACSA) is first proposed by drawing on the classic chirp scaling algorithm (CSA). The greatest improvement between SMACSA and CSA is the azimuth walk introduced by non-stop-hop-stop mode. Finally, the validity of SMACSA is proved by computer simulation.