Source Power Spectrum Estimation Using r-ω Interference Structure in Shallow Water

摘要

The power spectrum of the radiated signal is an important feature of passive target recognition. A method to estimate the power spectrum features of the source by using the range-frequency(r-ω) interference fringe structure is proposed, which uses a horizontal array to receive the broadband signal radiated by an unknown source and obtains the sound intensity interference structure of the r-ω plane. And it combines the waveguide invariant to correct the influence of the dispersion and absolute distance on the r-ω sound intensity interference characteristics. Then, with no completely environmental information but the waveguide invariant, by tracking a certain corrected interference bright fringe, the method can extract the normalized source power spectrum. The feasibility of this method is verified by numerical simulation.