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12 January 2009 Extraction of shaft-rate modulated electric fields of a ship in shallow sea with strong background noise
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Proceedings Volume 7133, Fifth International Symposium on Instrumentation Science and Technology; 71331V (2009) https://doi.org/10.1117/12.810596
Event: International Symposium on Instrumentation Science and Technology, 2008, Shenyang, China
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.
© (2009) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Bin Shen, Shen-guang Gong, Xin-qin Chen, and Fan Zhang "Extraction of shaft-rate modulated electric fields of a ship in shallow sea with strong background noise", Proc. SPIE 7133, Fifth International Symposium on Instrumentation Science and Technology, 71331V (12 January 2009); https://doi.org/10.1117/12.810596
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