Abstract
Currently realizable carrier-free millisecond or microsecond pulse for novel sonar system has advantages: attaining more target information, restraining fluctuation of reverberation envelop efficiently in short-range detection and achieving accurate estimation. Detection of such short pulse is one of significant tasks for high-resolution sonar system. However, Fourier Transform spectrum of short pulse locates widely and transiently in frequency domain without detailed information, which is difficult to separate short pulse from noise. Short Time Fourier Transform, Wavelet Transform and Hilbert-Huang Transform were employed to analyze short pulse to obtain different time-frequency characteristics, so as to seek for detection methods. Time-frequency characteristics for three time-frequency method are largely identical but with minor differences. A tri-channel detector is assumed for short pulse based on differences of three time-frequency characteristics.
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Ni, Y., Chen, H. (2012). Time Frequency Analysis of Underwater Carrier-Free Pulse. In: Liu, C., Wang, L., Yang, A. (eds) Information Computing and Applications. ICICA 2012. Communications in Computer and Information Science, vol 307. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-34038-3_75
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DOI: https://doi.org/10.1007/978-3-642-34038-3_75
Publisher Name: Springer, Berlin, Heidelberg
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