Normal mode wave-number estimation using horizontal synthetic aperture array

A moving synthetic aperture processing with high resolution spectral analysis method was provided to estimate the mode wave-number of acoustics in shallow water waveguide, and to overcome the problem of short aperture.First,large aperture synthetic array is created by a moving of short horizontal array,then a MUSIC processing is applied to the estimation of normal mode wave-number.The simulated and sea trial results indicate that the problem of short aperture can be resolved by using of synthetic aperture processing,and the accuracy of estimation in normal mode wave-number could be improved by varying the array depth when it is being towed away from the source.