  Separating raypaths in a multipath shallow-water environment is a challenge
problem due to the interferences between them and colored noise existing in
ocean environment, especially for two raypaths arrive close to each other.
Thus, in this paper, a three dimensional (3D) higher-order raypath separation
in an array to array configuration is proposed. Performance tests using
simulation data in a multipath environment, real data obtained in an ultrasonic
waveguide and ocean shallow-water data, respectively, illustrate that the
proposed algorithm achieves a higher resolution and a stronger robustness
comparing to the existing algorithms.
