Title :
DEMONgram Enhancement Based on Hough Transformation
Author :
Gao Xin ; Liu Qi-Jun
Author_Institution :
Navig. Fac., Navy Submarine Acad., Qingdao, China
Abstract :
Line spectrum in DEMONgram of ship-radiated noise is a set of linear. According to this characteristics, this paper provides a enhancement technique of DEMONgram based on Hough transform for line spetrum detection. Weighting coefficient for each DEMONgram can be determined without knowing the propeller shaft frequency. It solved the problem of evaluating definition of DEMONgram. The analysis of the Sea test data shows the signal to noise ratio of propeller shaft and blade frequency are noticeably improved and line spectrum is clearer, attaining the goal of enhencing DEMONgram.
Keywords :
Hough transforms; acoustic noise; propellers; ships; spectral analysis; DEMONgram enhancement; Hough transform; blade frequency; line spectrum detection; propeller shaft; sea test data; ship-radiated noise; signal to noise ratio; Computers; Navigation; Propellers; Shafts; Sonar; Transforms; Underwater vehicles; DEMONgram; Hough transformation; enhencement; subband;
Conference_Titel :
Electrical and Control Engineering (ICECE), 2010 International Conference on
Conference_Location :
Wuhan
Print_ISBN :
978-1-4244-6880-5
DOI :
10.1109/iCECE.2010.1236
