基于严格解析谱的多接收子阵合成孔径声呐CZT算法

CZT Algorithm for Multiple-receiver Synthetic Aperture Sonar Based on the Exact Analytical Two-Dimensional Spectrum

针对多接收子阵合成孔径声呐(SAS)精确二维谱表达式复杂,从而只能应用于RD算法的问题,提出将严格解析谱的距离徙动近似为斜距变量的线性函数,然后利用Chirp-z变换校正距离徙动,并给出基于严格解析谱的多接收子阵SAS CZT算法。提出的基于严格解析谱的算法避免了插值操作,提高了算法效率与相位保真度,仿真实验表明,提出算法的成像精度在近距离处优于传统基于等效相位中心近似(DPC)的CZT算法。

The exact analytical two-dimensional spectrum of multiple-receiver synthetic aperture sonar(SAS)is very com⁃plex,so it can be only used in RD algorithm.This paper proposes that the range cell migration of the exact analytical two-dimension⁃al spectrum can be approximated as a linear function of slant range,then the range cell migration can be corrected by Chirp-z trans⁃form,and gives CZT algorithm for multiple-receiver SAS based on the exact analytical two-dimensional spectrum,which avoids the interpolation processing,so the efficiency is improved and the phase is preserving.Simulation data shows that the imaging accuracy the proposed algorithm is better than the CZT algorithm based on DPC approximation.