物理学报2012，Vol.61Issue(5)：274-280,7.
基于时空滤波理论的低频声场干涉结构研究
Researches on the interference structure in low-frequency acoustic field based on space-time filter theory
摘要
Abstract
Compared with the waveguide invariant, the interference structures in low-frequency acoustic field are more comprehensively described by four system functions： coherent function, power response function, spread function and dual-frequency function, from space-time filter theory. A stable interference structure in the low-frequency acoustic field is testified based on theoretical analysis, simulation and sea trial data processing. When the target moves in a uniform rectilinear motion from far to near then from near to far, the interference structure of coherent function （LOFARgram） appears to be a family of quasi hyperbolas; the interference structure obtained by power response function represents the group delay difference and the dispersive characteristic of the normal mode; and the phase slowness difference can be exhibited by dual-frequency function. Each system function owns special characteristics, which can give prominence to certain features of the interference structure.关键词
干涉结构/时空滤波理论/波导不变量/低频声场Key words
interference structure/space-time filter/waveguide invariant/low-frequency acoustic field分类
数理科学引用本文复制引用
余赟,惠俊英,陈阳,惠娟,殷敬伟..基于时空滤波理论的低频声场干涉结构研究[J].物理学报,2012,61(5):274-280,7.基金项目
水声技术国防科技重点实验室基金（批准号：9140c200201090C2004,9140c2002100802）、声纳技术国家级重点实验室开放基金（批准号：kf201001）和国家自然科学基金（批准号：51009041）资助的课题. （）
