| 水下沉底目标回波的小波谱重排时频分析及其匹配检测 |
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| 引用本文： | 王强.水下沉底目标回波的小波谱重排时频分析及其匹配检测[J].华南理工大学学报(自然科学版),2010,38(1). |
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| 作者姓名： | 王强 |
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| 作者单位： | 浙江大学 信息与电子工程系
中国计量学院 质量与安全工程学院 |
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| 摘 要： | 在浅海沉底目标主动声探测中，强混响背景下回波有效特征表征是目标分类的基础。根据工程需要讨论了Wigner-Ville，短时傅立叶变换(STFT)和小波重排谱下回波时频特征的提取过程，分析了混响与目标回波的耦合特性。提出构造基于小波尺度谱重排的时频检测器，在时频面实现目标信号和混响分离，以小波重排谱来表征回波，可取得较好的效果，在此基础上设计时频匹配检测器，以达到较好的目标检测性能。湖试数据分析表明小波尺度谱重排联合二维匹配检测器能压抑混响，提高信混比约2dB.
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| 关 键 词： | 回波 时频特征 谱重排 时频匹配滤波 小波尺度谱 |
| 收稿时间： | 2008-12-12 |
| 修稿时间： | 2009-4-25 |
Reassignment Wavelet Scalogram Time-frequency Representation and Its 2-D Matched Filter Detection Underwater Bottom Object |
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| Abstract: | Abstract: In shallow water area, bottomed object detection remains a challenge, effective feature extraction is foundation in underwater mine recognition. The synthesis the time-frequency spectrum of target echoes help to extract robust features. Considering engineering requirement, the reassigned Wigner-Ville, short time Fourier transform (STFT) and wavelet scalogram distribution are discussed. In time-frequency(TF) plane, reverberation and echo seriously coupled. Reassigned wavelet is applied to represent bottom target echo contaminated by reverberation, identify the scalogram coupling characteristics in TF plane. Then TF matched filter is designed to improve detection performance. The proposed scheme is useful in feature extraction of bottom target. The lake test results proved effectiveness of proposed scheme and it improve signal reverberation ration of detection process about 2 dB. |
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| Keywords: | Sonar echoSonar echo Time-frequency feature TF Reassignment TF matched filter Wavelet scalogram |
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