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192 IEEE JOURNAL OF OCEANIC ENGINEERING, VOL. 25, NO. 1, JANUARY 2000 Underwater Target Detection Using Multichannel
 

Summary: 192 IEEE JOURNAL OF OCEANIC ENGINEERING, VOL. 25, NO. 1, JANUARY 2000
Underwater Target Detection Using Multichannel
Subband Adaptive Filtering and High-Order
Correlation Schemes
Chunhua Yuan, Mahmood R. Azimi-Sadjadi, Senior Member, IEEE, JoEllen Wilbur, Member, IEEE, and
Gerald J. Dobeck
Abstract--In this paper, new pre- and post-processing schemes
are developed to process shallow-water sonar data to improve the
accuracy of target detection. A multichannel subband adaptive
filtering is applied to preprocess the data in order to isolate the
potential target returns from the acoustic backscattered signals
and improve the signal-to-reverberation ratio. This is done by
estimating the time delays associated with the reflections in dif-
ferent subbands. The preprocessed results are then beamformed
to generate an image for each ping of the sonar. The testing results
on both the simulated and real data revealed the efficiency of this
scheme in time-delay estimation and its capability in removing
most of the competing reverberations and noise. To improve
detection rate while significantly minimizing the incident of false
detections, a high-order correlation (HOC) method for postpro-

  

Source: Azimi-Sadjadi, Mahmood R. - Department of Electrical and Computer Engineering, Colorado State University

 

Collections: Computer Technologies and Information Sciences