Efficient parameter estimation of polynomial-phase signals impinging on a sensor array

The estimation of direction-of-arrival (DOA) and parameters of polynomial-phase signals (PPSs) impinging on sensor array is considered. A method with decreased signal-to-noise ratio (SNR) threshold compared to the concurrent methods is proposed. In the method, both DOA and PPS parameters are estimated by maximizing spectra of the higher-order instantaneous moments of the received signal. The SNR threshold decrease is obtained by the spectra product approach which suppresses false peaks due to noise. The proposed method is suitable for use in underwater applications where hydrophone arrays with tens or hundreds of sensors are used.