Search results for: Zhaotong Zhu
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A novel denoising method which introduces guided filter form image processing filed to denoise acoustic signal is proposed in this paper. It is important to choose a right guidance signal for the guided filter and wavelet denoising will be used to get guidance signal in this paper. For acoustic signal, getting the actual signal without noise is difficult, and it will affect the identification of the...
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Like other dolphins, Sousa Chinensis produces click signals to echolocate in underwater. Research on the source level (SL) of click signal transmitted by Sousa Chinensis is beneficial to understand the survival and behavior of such animals. In the shallow sea where the Sousa Chinensis lives, the underwater environment is so complex that causes the click signals propagation to the receiving hydrophone...
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In order to solve the contradiction of high azimuth resolution and wide swath in sonar and radar imaging, narrowband compressed sensing (CS) imaging has been studied in depth. This paper studies the wideband sonar imaging method via CS. Wideband CS imaging model is constructed. Scaling and Doppler frequency shift are considered in the model. The effect of wideband signal to traditional narrowband...
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Sonar image automatic target recognition (ATR) is urgently needed in large-scale marine investigation. A modelbased Sonar image ATR method based on SIFT features is proposed in this paper. The proposed method can realize ATR for arbitrary shaped target by physically model 3D under water scene, generate simulated template images, extract Scale-invariant feature transform (SIFT) keypoints and matching...
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2013 OCEANS - San Diego > 1 - 4
In this paper, we propose dynamic joint networkchannel coded cooperation (DJNCC), for an underwater data collection problem, where multiple underwater nodes need to send data to one common destination. DJNCC seamlessly couples channel coding and dynamic network coded cooperation (DNC) to effectively combat the detrimental effect of fading of underwater channels, utilizing the fact that underwater...
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Underwater acoustic communications are required for controlling and networking a variety of underwater or sea surface objects. Due to the unique characteristics of the underwater acoustic channel, e.g., complicated multipath propagation, selective frequency fading, extreme Doppler effect and heavy ambient noise, FH-MFSK techniques play a vital role in robust underwater acoustic communication, especially...
