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Acta Armamentarii ›› 2022, Vol. 43 ›› Issue (7): 1655-1666.doi: 10.12382/bgxb.2021.0420

• Paper • Previous Articles     Next Articles

Parameterized Time-frequency Analysis in Continuous-wave Active Detection

XUE Cheng1,2, GU Yiming1, GONG Zaixiao1, LI Zhenglin1,3   

  1. (1.Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China;2.University of Chinese Academy of Science, Beijing 100049, China;3.School of Ocean Engineering and Technology, Sun Yat-sen University, Zhuhai 519000, Guangdong, China)
  • Online:2022-05-30

Abstract: Acontinuous wave signal processing algorithm is proposed based on parameterized time-frequency analysis to address the problems of target echo detection and direct wave interference suppression of hyperbolic frequency modulation signal in continuous-wave active detection. First, based on the analysis of the time-frequency characteristics of the hyperbolic frequency modulated continuous wave signal andthe idea of parameterized time-frequency analysis, we propose afrequency-domain parameterized time-frequency transform suitable for active detection and the kernel function design for hyperbolic frequency modulated signal. Then, to suppress the direct wave interference in the received signal, the parameterized rotating time-frequency transform is used, along with the time-frequency domain filtering in order to separate the signal components, and then the echo signal is reconstructed via the inverse transform. Numerical simulation and marine experimental results show that the proposed algorithm not only can accurately estimate the time-frequency characteristics of the signal, effectively obtain the time-frequency gain of the hyperbolic frequency modulated continuous wave signal, and improve the detection performance, but also can effectively suppress direct wave interference.

Key words: hyperbolicfrequencymodulationsignal, continuous-wavesonar, parameterizedtime-frequencytransformation, time-frequencyfilter

CLC Number: