利用线谱声强干涉起伏相关系数估计波导不变量

The waveguide invariant is usually not extracted from the striation pattern of broadband continuous spec⁃ trum in the low frequency analysis and recording spectrum at low signal⁃to⁃noise ratio. In this paper, the correlation coefficient of multi⁃tonal acoustic intensity interference fluctuation is utilized to estimate waveguide invariant. Since the proportional relationship between the reference intensity interference fluctuation and the scaled intensity interfer⁃ ence fluctuation is dependent on waveguide invariant, the waveguide invariant estimation can be done. Firstly, the tonal intensity interference fluctuation has been resampled in the new time domain under the radial and non⁃radial motion models respectively. Then, the similarity degree between the resampling reference tonal intensity interference fluctuation and the scaling tonal intensity interference fluctuation can be described by correlation coefficient, and the peak of correlation coefficient is corresponding to the true value. Finally, the numerical results and the experi⁃ mental results prove the proposed method′s effectiveness.