Prefiltered Striation-Based Beamforming for Range Estimation of Multiple Sources

The element–frequency acoustic intensity of a horizontal line array with sufficient aperture exhibits interference striation patterns, which can be used for source range estimation without prior environmental information. Under multisource scenarios, the striations sources overlap each other, leading to great difficulty in utilizing information striations. In this paper, wavenumber filtering method is applied sensor extract surface-reflected–bottom-reflected modes and reconstruct recognizable spectrogram source. Then, via beamforming along striations, ranges estimated individually little long-time observation moving sources. required spacing analyzed, spatial capabilities single from different bearings two azimuth angles are close other have also been investigated. simulation results indicate that proposed algorithm estimate multiple within 25 km, relative errors less than 4%.