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http://dx.doi.org/10.7776/ASK.2012.31.6.384

A DEMON Processing Robust to Interference of Tonals  

Kim, Jin-Seok (국방과학연구소 소나체계개발단)
Hwang, Soo-Bok (국방과학연구소 소나체계개발단)
Lee, Chul-Mok (국방과학연구소 소나체계개발단)
Publication Information
The Journal of the Acoustical Society of Korea / v.31, no.6, 2012 , pp. 384-390 More about this Journal
Abstract
Passive sonars employ DEMON(Detection of Envelope Modulation on Noise) processing to extract propeller information from the radiated noise of underwater targets. However, the conventional DEMON processing suffers from the interference of tonal signals because it extracts propeller signals and some types of tonal signals as well. If there are some tonals in the frequency band for DEMON processing, the conventional DEMON processing may additionally extract frequency informations originated from the interaction between different tonals. In this paper, we propose a modified DEMON processing, which can eliminate the interference of the tonals. The proposed algorithm removes tonals in DEMON processing band before demodulation processing, hence results the robustness to the interference of the tonals. Some numerical simulations demonstrate the improved performance of the proposed algorithm against the conventional algorithm.
Keywords
DEMON Processing; Tonal; Cavitation Noise; Propeller Information; Passive Sonar;
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