Bao Zhong-hua

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The purpose of this paper is to effectively extract the line spectrum of ship shaft-rate electric signal from ocean environmental electric field. Firstly, the frequency domain characteristic of ocean environmental electric field is analyzed and the received signal corrupted by noise is pretreated by a band-pass filter whose pass band is 1∼10Hz. Then,(More)
This paper proposes a novel detection approach for harmonics in strong additive background noise. Firstly, a wavelet packet transform based filter bank was used to decompose the received noisy signal into several orthogonal sub-band signals. And then, combined with adaptive threshold floating technique, a group of sliding power detectors was applied to(More)
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