宽波束多子阵SAS线频调变标成像算法

Chirp scaling imaging algorithm for wide-beam multiple receiver SAS

针对现有基于窄波束假设的多子阵合成孔径声纳(SAS)成像算法忽略了非停走停时间和偏置相位中心误差的方位空变性,在宽波束条件下将导致成像质量下降这一问题,在考虑非停走停时间二阶方位空变性和偏置相位中心误差三阶方位空变性的基础上,提出一种适用于宽波束的高分辨多子阵合成孔径声纳线频调变标成像算法.该算法通过数据预处理将多子阵的回波数据转化为收发合置的形式,进而利用经典的单阵线频调变标算法实现高分辨多子阵合成孔径声纳复图像的重建,仿真试验和湖试实测数据成像结果验证了所提算法的有效性.

Most existing imaging algorithms for multiple receiver synthetic aperture sonar （SAS ） based on narrow‐beam assumption neglects the azimuth‐variance property of non stop‐hop‐stop time and displacement phase center （DPC） approximation errors ,w hich maybe leads to some serious image degradation in the wide‐beam cases .To solve this problem ,the second‐order azimuth‐variance proper‐ty of non stop‐hop‐stop time and the third‐order azimuth‐variance property of DPC approximation er‐rors were taken into account in this study .Based on that ,an effective chirp scaling （CS） imaging al‐gorithm was proposed for the imaging of wide‐beam multiple receiver SAS .In the practical imaging , the multiple receiver SAS data was preprocessed and translated into the form of monostatic SAS first‐ly ,and then the high resolution SAS complex image could be reconstructed by the conventional CS al‐gorithm .The results of simulation and real data imaging confirmed the effectiveness of the proposed algorithm .