基于Warping变换的波导时频分析
Analysis of waveguide time-frequency based on Warping transform
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摘要: 海洋波导的存在使得信号在水中传播过程中产生频散,从而降低了信号处理质量。基于声场的波导不变特性,给出了一种具有普遍意义的Warping变换,这种变换可以将波导中的信号频散特性简单化。数值仿真结果表明,只需要知道波导不变量的取值范围就可以很好地提取出波导的频散曲线,数值仿真和海上实验数据给出了较为理想的结果。Abstract: Sound propagation in underwater will induce dispersion due to the natural sea waveguide, and then it will degrade the results of the signal processing. Based on the waveguide invariant, a general warping transform is presented. This warping transform could extract the waveguide mode dispersion curve and remove the effect of the waveguide dispersion. Results from the simulation and experiment show that the transform woks well.
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