Motion speed is the important characteristic of passive acoustic source. Target motion analysis (TMA) is accredited, which is very effective technique when target's azimuth changes along with motion. With small variable rate of azimuth in far-field, however, TMA's performance degrades generally. This paper describes one novel approach for passive estimation of radial speed and depth of acoustic source based on moving-source normal mode theory and matched-filed processing (MFP). Joint speed and depth estimation can achieve robustness to environmental mismatch in matched-field processing, since it depends only on production of horizontal wavenumber differences and variation of source range. Broadband incoherent matched-field processing method for passive speed estimation is introduced with combined spatial and temporal processing. Simulation and sea experimental data analyses verify the performance especially for radial speed estimation.
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