Improvement of Low-Frequency Acoustic Spatial Correlation by Frequency-Shift Compensation

Interference of normal modes can lead to longitudinal decorrelation of an ocean acoustical field, so it can decrease the gain of a wide-aperture array. Based on waveguide invariance, we propose a frequency-shift compensation method that can be used to improve the signal correlation received at different locations with certain longitudinal separations. The method is verified by experimental data.