Clutter reduction using Doppler sonar in a harbor environments
學年 101
學期 1
出版(發表)日期 2012-11-08
作品名稱 Clutter reduction using Doppler sonar in a harbor environments
著者 T.C. Yang; J. Schindall; C.-F. Huang; Jin-Yuan Liu
著錄名稱、卷期、頁數 Journal of Acoustical Society of America,132(5),p.3053-3067
摘要 A high frequency experiment was conducted in the Woods Hole Harbor in Massachusetts to evaluate the effectiveness of Doppler sonar for discriminating targets from reverberation. Using a pulsed linear frequency modulated signal, one finds that the matched filtered outputs are filled with high-level discrete backscattered returns, referred to as clutter, which are often confused with the target echo. The high level non-target returns have an amplitude distribution that is heavy-tailed. Using a Doppler-sensitive binary-phase-shift-keying signal coded with an m-sequence, the target echo and clutter can be separated by Doppler and delay, and tracked using the Doppler spectrogram (Dopplergram). The Doppler filtered time series show a background reverberation with a Rayleigh-like amplitude distribution, with an improved signal-to-(peak) reverberation ratio compared with that without Doppler filtering. The reduced reverberation level with Doppler processing decreases the probability of false alarm (Pfa) for a given threshold level. Conversely, for a given Pfa, the higher signal-to-(peak) reverberation ratio implies a higher probability of detection. Transmission loss measurement was conducted to estimate some of the system parameters, e.g., the source level and target strength relative to the noise level.
語言 zh_TW
期刊性質 國內
國別 TWN
出版型式 ,電子版

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