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Waveguide Spatial Interference Filtering in Adaptive Matched Field Processing  

김재수 (한국해양대학교)
김성일 (국방과학연구)
신기철 (한국해양대학)
김영규 (국방과학연구)
박정수 (국방과학연구소)
Publication Information
The Journal of the Acoustical Society of Korea / v.23, no.4, 2004 , pp. 288-295 More about this Journal
Abstract
Detection and localization of a slow and quiet target in shallow water environments is a challenging problem for which it is well known that snapshot is deficient because of a fast and strong interferer. This paper presents waveguide interference filtering technique that mitigate strong interferer problems in adaptive matched field processing. MCM (multiple constraint method) based on NDC (null direction constraint) has been proposed for new spatial interferer filter. MCM-NDC using replica force a interferer component to be filtered through CSDM (cross-spectral density matrix). This filtering have an effect on sidelobe reduction and restoring of signal gain of a quiet target. This technique was applied to a simulation on Pekeris waveguide and vertical array data from MAPLE03 (matched acoustic properties and localization experiment) in the East Sea and was shown to improve SBNR (signal-to-background-and-noise ratio) over the standard MVDR (minimum-variance distortionless response) and NSP (null space projection) technique.
Keywords
Matched Field Processing; Spatial interferer filter; MVDR; NSP; MCM-NDC;
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