Abstract
Global positioning system (GPS) sonobuoys are widely used in underwater target localization. Most of the present underwater target tracking utilizing GPS sonobuoys rely on individual processing of the data provided by each sonobuoy. Coherent array processing of GPS sonobuoy fields was recently suggested in order to improve the overall system performance by proper combination of sonobuoys received signal. Therefore, it is essential to study the impact of underwater noise environment on target localization when an array of GPS sonobuoys is utilized. This paper introduces a complete analysis of the effect of different types of noisy environments. The overall system performance is evaluated for each environment for both individual sonobuoy processing and coherent array processing. Simulation was used to examine the effect of both white Gaussian noise and correlated noise on the overall system performance in the presence of two sources of interference at variable signal to noise ratios (SNR). Each sonobuoy signal is de-noised by wavelet analysis prior to processing multiple sonobuoy signals by beamforming to provide accurate bearing information for the target. The results discuss the impact of wavelet de-noising and the array processing in improving the overall system accuracy for different noisy environments at different SNRs.
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