Application of the direct blast adaptive suppression method to the forward scattered broadband signa

来源 :Chinese Journal of Acoustics | 被引量 : 0次 | 上传用户:weiyuan2009
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
The basic principles of target detection by forward acoustic scattering are presented.A direct blast suppression approach based on adaptive filtering(DBS-AF) is proposed to suppress the direct blast.The DBS-AF technique is extended to the linear frequency modulation(LFM) signal,where the envelope of the signal is regarded as a “general waveform” and imported into the adaptive filter.Application of the DBS-AF method to the data collected from a lake trial yields an output detection curve,in which the direct blast is mapped to the background while the acoustic field aberration is represented by the peak value fluctuation.The inhibitory effect in single hydrophone is approximately- 5 dB,and is then enhanced by exploiting the mean value removal approach as a preprocessing technique.The direct blast is further suppressed to a level of-10 dB by making full use of multichannel receptions.The main factors affecting the algorithm performance are as follows:the fluctuation degree of the receptions during the weighting vector training period and the power ratio of the forward scattered wave to the direct blast when the target is present. The basic principles of target detection by forward acoustic scattering are presented. A direct blast suppression approach based on adaptive filtering (DBS-AF) is proposed to suppress the direct blast. The DBS-AF technique is extended to the linear frequency modulation (LFM) signal, where the envelope of the signal is regarded as a “general waveform ” and imported into the adaptive filter. Application of the DBS-AF method to the data collected from a lake trial yields an output detection curve, in which the direct blast is mapped to the background while the acoustic field aberration is represented by the peak value fluctuation. The inhibitory effect in single hydrophone is approximately- 5 dB, and then then by exploiting the mean value removal approach as a preprocessing technique. direct blast is further suppressed to a level of-10 dB by making full use of multichannel receptions.The main factors affecting the algorithm performance are as follows: the fluctuation degree of the recept ions during the weighting vector training period and the power ratio of the forward scattered wave to the direct blast when the target is present.
其他文献
1980年冬天,中央决定项南担任中共福建省委常务书记。被打成“右倾”的项南,从落实政策到出任改革开放前沿省的主要领导,是时任中共中央总书记胡耀邦的举荐,更是中国改革开
本文主要描述了利用1J50材料初次再结晶机制,通过精确调节退火温度达到控制织构取向,使立方织构[001]易磁化方向尽量与轧向平行,降低其偏出度。同时选择最优冲压取向使器件得
随着国家相继颁布各项与会计相关的规章制度,会计体制越来越健全,尤其是特别关注事业单位会计制度的执行。虽然中小学校是培养人才的摇篮,可是会计工作同样重要。然而,中小学
TH - 2 90电焊条 (原为HT - 2 97)采用Ca -CaF2-SiO2 渣系 ,由于沿用YS配方公式 ,TH - 2 90电焊条具有抗裂性能佳 ,飞溅小 ,脱渣容易 ,焊缝成形美观 ,焊后不起层 ,耐磨性高 ,
中国译协三届二次常务理事会(扩大)会议于1995年4月7日在北京中国外文局召开。出席会议的有在京的常务理事和副秘书长共31人。中国译协秘书处、《中国翻译》编辑部、中外翻
Different routes,including the replacements of the template,addition of pore expander and hydrothermal post-synthesis treatment have been used for the pore engi
李玉芙出身京剧名家,自小酷爱京剧,1951年入哈尔滨京剧院当学员。由于她天资聪颖,练功刻苦,青年时期已是旦行中的佼佼者。1952年秋她考入北京戏曲学校,专攻梅派表演艺术。梅
2017年,英特尔公司将利用其制造业优势研发新一代芯片。目前看来,对于摩尔定律的未来发展,人们普遍持悲观态度。但英特尔公司对于摩尔定律的前景,至少在未来几年内,则持绝对
泥沙密度是河流泥沙的主要物理特性之一。本项试验研究采集了黄河干支流23个水文站526个泥沙样品,基本覆盖了黄河上、中、下游各河段及主要支流泥沙来源区,泥沙样品具有广泛的代表性
本文围绕新医院会计制度下医院内部控制制度建设的意义、新医院会计制度下医院内部控制制度的完善措施两个方面展开讨论,对新医院会计制度下医院内部控制制度的构建进行了全