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Researches on the interference structure in low-frequency acoustic field based on space-time filter theory

Yu Yun Hui Jun-Ying Chen Yang Hui Juan Yin Jing-Wei

Researches on the interference structure in low-frequency acoustic field based on space-time filter theory

Yu Yun, Hui Jun-Ying, Chen Yang, Hui Juan, Yin Jing-Wei
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  • Received Date:  26 October 2010
  • Accepted Date:  19 May 2011
  • Published Online:  05 March 2012

Researches on the interference structure in low-frequency acoustic field based on space-time filter theory

  • 1. Naral Academy of Armament, Beijing 100161, China;
  • 2. Science and Technology on Underwater Acoustic Laboratory, Harbin Engineering University, Harbin 150001, China
Fund Project:  Project supported by the Science and Technology Foundation of State Key Laboratory of Underwater Acoustic Technology, China (Grant Nos. 9140C200201090C2004, 9140C2002100802), National Key Laboratory of Sonar Fund (Grant No. kf201001) and National Natural Science Foundation of China (Grant No. 51009041).

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.

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