摘要
在深入研究了合成孔径声呐(SAS)中距离-多普勒(R-D)成像算法的基础上,针对SAS的斜视和大面积测绘的应用,放弃菲涅耳假设得到了一个在正侧视和斜视情形下同时适用的改进R-D算法。避免了二次距离压缩(SRC),同时提高了斜视下的成像效果。并且该算法易于结合自聚焦环节实现运动补偿。最后以仿真结果证明了改进算法的有效性。
Based on deep study of conventional range-doppler (R-D) algorithm in Synthetic Aperture Sonar (SAS), a improved R-D algorithm applied to squint looking as well as side looking by abandoning the Presnel assumption is derived in this paper. Secondary Range Compressing (SRC) is avoided and imaging effect is improved remarkably in squint-looking use. Moreover, the steps in the algorithm are expressed only by Doppler center and Doppler rate, which can naturally realize motion compensation combined with auto-focusing steps. At last it is concluded that the modified algorithm is effective by squint-looking SAS simulation.
出处
《声学学报》
EI
CSCD
北大核心
2003年第4期351-356,共6页
Acta Acustica
基金
国家自然科学基金(60128102)
