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Proceedings Paper

Extraction of shaft-rate modulated electric fields of a ship in shallow sea with strong background noise
Author(s): Bin Shen; Shen-guang Gong; Xin-qin Chen; Fan Zhang
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Paper Abstract

The electric field is the intrinsic characteristic of a ship. The measurement of the electric field of a ship is greatly disturbed by noise in shallow sea. The measured signals can be processed using wavelet transform, adaptive filtering or time-frequency analysis. Adaptive filtering can be used to remove a part of ambient noise. But the filtering effect is not obvious because a certain type of industrial interference signal is also of an extremely low frequency, When wavelet transform is used to remove noise, most noises from the electric fields of sea are removed. However, it also has nothing to do with the periodical noises with an extremely low frequency. As far as time frequency method is concerned, the original signals are first analyzed within the frequency band, and then they are compared with the measured ambient signals. After the range of shaft-modulated signals are found, the signals of required frequency band are extracted for further IFFT transform. The processing results show that the traffic characteristic of a ship is very clear, representing the signals are extracted out.

Paper Details

Date Published: 12 January 2009
PDF: 7 pages
Proc. SPIE 7133, Fifth International Symposium on Instrumentation Science and Technology, 71331V (12 January 2009); doi: 10.1117/12.810596
Show Author Affiliations
Bin Shen, Naval Univ. of Engineering (China)
Wuhan Non-Commissioned Officers School for Ordnance (China)
Shen-guang Gong, Naval Univ. of Engineering (China)
Xin-qin Chen, Naval Univ. of Engineering (China)
Fan Zhang, Naval Univ. of Engineering (China)


Published in SPIE Proceedings Vol. 7133:
Fifth International Symposium on Instrumentation Science and Technology
Jiubin Tan; Xianfang Wen, Editor(s)

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