简介:Inunderwatertargetdetection,thebottomreverberationhassomeofthesamepropertiesasthetargetecho,whichhasagreatimpactontheperformance.Itisessentialtostudythedifferencebetweentargetechoandreverberation.Inthispaperbasedontheuniqueadvantageofhumanlisteningabilityonobjectsdistinction,theGammatonefilteristakenastheauditorymodel.Inaddition,time-frequencyperceptionfeaturesandauditoryspectrafeaturesareextractedforactivesonartargetechoandbottomreverberationseparation.Thefeaturesoftheexperimentaldatahavegoodconcentrationcharacteristicsinthesameclassandhavealargeamountofdifferencesbetweendifferentclasses,whichshowsthatthismethodcaneffectivelydistinguishbetweenthetargetechoandreverberation.
简介:针对广州市轨道交通6号线首期工程的复杂地段,因地制宜、勇于创新地进行明暗挖结合车站的设计实践,全线10座明暗挖车站中,有9种不同形式的明暗结合方式。利用三维建模技术,对各站明暗结合特点进行分析:文化公园左线采用暗挖以免影响地面古树;海珠广场站是国内首次采用上明下暗结合的车站,丰富了明暗结合的形式;一德路站、沙河站车站暗挖区间的施工确保全线的运营开通,突出了明暗挖车站的优点;团一大广场站,地面附属与广场景观融为一体;东山口站先隧后站,确保工期;区庄站超浅埋大断面暗挖,其难度为国内之最;黄花岗站地下站厅与周边环境的充分结合,做到地铁参与各方多赢的格局;燕塘站基底处理成为范例。