| 摘要 |
<p>The invention relates to a method which is suitable for use in the field of underwater detection and, more specifically, to the problem associated with the detection of low-power acoustic underwater objects by passive detection systems, of the passive drifting buoy type, which are used, for example, by maritime patrol systems. The inventive method consists in processing the complex amplitude/azimuth spectrum of an acoustic signal received by a directional buoy. For different envisaged target models, the aforementioned processing comprises: (i) the association of the complex frequency components of the received signal, which are located along the time-evolution curve of the frequency of a signal corresponding to a model target; and (ii) a comparison of the module and argument variation of said frequency components with the module and argument variation over time of the spectral components of the signal corresponding to the model. For said purpose, the processing involves the use of both the amplitude and azimuth information contained in the signal received. According to the invention, the processing can be used to produce representations of the evolution of the signal received, both in frequency form and in geographical form. In addition, the invention enables the fusion of data originating from several buoys being used simultaneously in the same zone.</p> |
