Cross-pattern coherence spatial filtering with hydrophone arrays for passive-sonar applications

Tutkimustuotos: Artikkeli kirjassa/konferenssijulkaisussaConference article in proceedingsScientificvertaisarvioitu

1 Sitaatiot (Scopus)

Abstrakti

This paper presents a spatial post-filtering algorithm for passive-sonar systems deploying linear hydrophone arrays. The algorithm provides an attenuation parameter in the time-frequency domain based on the normalised cross-spectral density between two signals, which originate from two coincidentally steered conventional beamformers. The computed parameter can be applied as a single-channel spectral post-filter to the output of another beamformer to suppress background noise and interference. The technique is evaluated with simulated data of two 96-channel flank arrays, as well as with real-world data derived from smaller towed linear arrays. The evaluation includes two array configurations: a) a single-line configuration using two non-overlapping subdivisions of a linear array for the computation of the parameter, and b) a dual-line configuration using two parallel linear arrays. In all studied cases, the post-filter is shown to improve the resolution and background-noise suppression capabilities of the baseline beamformers. It is further shown that, in the dual-line configuration, the post-filter may improve the beamforming performance near the end-fire direction as well as further resolve the port-starboard ambiguity, which is a known drawback of towed linear arrays. Lastly, it is worth noting the relatively low computational complexity of the proposed technique compared to the more demanding adaptive beamformers.
AlkuperäiskieliEnglanti
OtsikkoProceedings of the 24th International Congress on Acoustics: A19: Underwater Acoustics
KustantajaAcoustical Society of Korea (ASK)
Sivumäärä11
TilaJulkaistu - 31 lokak. 2022
OKM-julkaisutyyppiA4 Artikkeli konferenssijulkaisussa
TapahtumaInternational Congress on Acoustics - Hwabaek International Convention Center (HICO), Gyeongju, Etelä-Korea
Kesto: 24 lokak. 202228 lokak. 2022
Konferenssinumero: 24
https://ica2022korea.org

Julkaisusarja

NimiProceedings of the ICA congress
Vuosikerta2022
ISSN (elektroninen)2415-1599

Conference

ConferenceInternational Congress on Acoustics
LyhennettäICA2022
Maa/AlueEtelä-Korea
KaupunkiGyeongju
Ajanjakso24/10/202228/10/2022
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