A passive source ranging method based on the frequency warping transform of the vertical intensity flux in shallow water
Qi Yu-Bo1, †, Zhou Shi-Hong1, Yu Meng-Xiao1, Du Shu-Yuan1, Sun Mei2, Zhang Ren-He1
       

Waterfall plot of the unwarped and warped vertical intensity flux at different ranges with 0 s zeroing length. (a) Unwarped real part of the vertical intensity flux, (b) warped real part of the vertical intensity flux, (c) unwarped imaginary part of the vertical intensity flux, and (d) warped imaginary part of the vertical intensity flux.