An algorithm for estimating doppler frequency of underwater high-speed moving target

Aiming at the problem of doppler frequency estimation of underwater high-speed moving target, based on the principle of ESPRIT algorithm, an improved ESPRIT algorithm is proposed. Using the time delay data of target echo signal to construct two sub-arrays with the same array shape, a matrix pencil is constructed by the cross covariance matrix of the two sub-arrays. By means of generalized eigen-decomposition of the matrix pencil, the doppler frequency of underwater high-speed moving target can be obtained. Compared with the standard ESPRIT algorithm, the improved ESPRIT algorithm does not require the eigen-decomposition of auto-covariance matrix, and thus has lower computational complexity. Computer simulation shows that the proposed method is effective for estimating doppler frequency of underwater high-speed moving target.