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Performance Analysis of the Pre-Whitening Matched Filter in Shallow Water Environment  

Yu, Seog-Kun (School of Electrical Engineering and Computer Science, Kyungpook National University)
Kim, Jeong-Goo (Computer Science and Engineering, Pusan National University)
Joo, Eon-Kyeong (School of Electrical Engineering and Computer Science, Kyungpook National University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.45, no.12, 2008 , pp. 152-158 More about this Journal
Abstract
In shallow water environment, the detection performance of an active sonar using matched filter with LFM(linear frequency modulation) pulse can be seriously degraded by reverberation which is considered as non-white noise. To reduce the effect of reverberation, a whitening filter preceding the matched fitter, is usually adopted. In the conventional pre-whitening filter, it is assumed that local stationarity is preserved between detection block and its right ahead block. And then by using the characteristics of the reverberation of preceding block, the reverberation of detection block is estimated and whitened. According to the environment of shallow water, the stationarity of reverberation may be preserved for more blocks. In this case, the reverberation of the detection block can be estimated more accurately if more blocks are used. In this paper, the real reverberation signal which is obtained from shallow sea is analyzed and its proper region of estimation block is examined. And the performance of pre-whitening matched filter is compared and analyzed according to the region of estimation block.
Keywords
잔향;능동소나;잔향 추정범위;백색화 필터;탐지기;
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