掩埋目标声散射特征提取

作者：李秀坤,吴玉双

摘要：Elastic acoustic scattering is important for buried target detection and identification. For elastic spherical objects, studies have shown that a series of narrowband energetic arrivals follow the first specular one. However, in practice, the elastic echo is rather weak because of the acoustic absorption, propagation loss, and reverberation, which makes it difficult to extract elastic scattering features, especially for buried targets. To remove the interference and enhance the elastic scattering, the de-chirping method was adopted here to address the target scattering echo when a linear frequency modulation (LFM) signal is transmitted. The parameters of the incident signal were known. With the de-chirping operation, a target echo was transformed into a cluster of narrowband signals, and the elastic components could be extracted with a band-pass filter and then recovered by remodulation. The simulation results indicate the feasibility of the elastic scattering extraction and recovery. The experimental result demonstrates that the interference was removed and the elastic scattering was visibly enhanced after de-chirping, which facilitates the subsequent resonance feature extraction for target classification and recognition.

发文机构：Acoustic Science and Technology Laboratory Ministry of Industry and Information Technology College of Underwater Acoustic Engineering

关键词：BURIEDtargetdetectionAcousticSCATTERINGELASTICSCATTERINGDe-chirpingFEATUREextractionBuried target detectionAcoustic scatteringElastic scatteringDe-chirpingFeature extraction

分类号： T[一般工业技术]