The Cross-Spectrum Approach for Underwater Multi-target Direction Estimation

In order to estimate the different azimuth angle of underwater multi-target with different frequency by DIFAR Sonobuoy, the correlation of pressure and velocity of signal and the uncorrelation of pressure and velocity of signal of noise to deduce a cross-spectrum approach of the azimuth estimation in frequency field. The simulation analysis illustrates that the amplitude of noise power spectrum which out of the line spectrum is obviously cut down and the azimuth estimation of the target is availably on the line spectrum. The cross-spectrum approach can effectively anti-noise and greatly improve the precision of direction performance.