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时间:2020-03-27
《粗糙海面激光透射特性研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、78上海AEROSPACE航天SHANGHAI第33卷2016年第6期文章编号:1006一1630(2016)06一0078一04粗糙海面激光透射特性研究李恪,姚崇斌,谢宝蓉,周勃(上海航天电子技术研究所,上海201109)摘要:为改善激光在粗糙海面上透射特性仿真结果的准确性以提高卫星海洋水色遥感应的效率,对不同海况下激光在粗糙海面的透射特性进行了研究。根据激光海面透射原理,用基尔霍夫近似(KA)原理求解激光海面透射场,给出了计算模型。基于Gaussian随机模型对三、四级海况的粗糙海面进行了三维模拟仿真,用解析法计算了激光在海面上的透射特性。结果发现:波长o.532”m的绿激光对
2、海水有高透射率,入射角小于40。时透射率大于94%;海况对激光的透射率影响较小;与下行透过率相比,上行透射率受入射角的影响较大,入射角大于40。时激光的上行透射率迅速衰减,入射角大于50。时上行透射率几乎为O。关键词:海洋水色遥感应;粗糙海面;激光;海色;透射特性;基尔霍夫近似;双站透射系数;入射角中图分类号:TN249文献标志码:ADOI:10.19328/j.cnk..1006—1630.2016.06.011StudyonLa∞rTransmissionCharacteristicsintoRoughSeaSurfacesLIKe,YAOChong-bin,XIEBao—ro
3、ng,ZHOUBo(ShanghaiAerospaceElectronicTechnologyInstitute,Shanghai201109,China)AbStr越t:Toimprovethesimulationaccuracyofthelasertransmissioncharacteristicintoroughseasurfaceforincreasingtheefficiencyofremotesensingofoceancolor,thelasertransmissioncharacteristicsintoroughseasurfacesindifferentsea
4、conditionswerestudiedinthispaper.Accordingtotheprincipleoflasertransmissionintotheseasurfaces,thelasertransmissioncharacteristicsintoroughseasurfacesindifferentseaconditionswerecomputedbyKirchhoffapproximation.Thecomputationmodewasderived.Theroughseasurfacesin3and4levelseaconditionsweremodulat
5、edbasedontheGaussianrandomfunction.ThelasertransmissioncharacteristicsinthetwoseaconditionswerecalculatedbytheanalyticaImethod.ItwasfoundthatthegreenlaserwiththewavelengthO.532肛mhadhightransmissionintotheseawaterwhichwasbiggerthan94%whentheincidentanglewassmallerthan40。.Theinfluenceoftheseacon
6、ditiononthetransmissionwassmall.Theinfluenceoftheincidentangleontheupreflectancewasbiggerthandownreflectance.Theuptransmissionwouldbeattenuatedquicklywhentheincidentanglewasbiggerthan40。andneartozerowhentheincidentanglewasbiggerthan50。.Keywords:Watercolorremotesensinglaser;Roughseasurfaces;Las
7、er;0ceancolor;Transmissioncharacteristics;Kirchhoffapproximation;Bistatictransmissioncoefficient;IncidentangleO引言海水颜色可作为各种能吸收和散射太阳光的海水组分(如浮游植物、有色可溶有机物、矿物粒子、海中气泡)含量的一个指示‘1
8、。目前,卫星海色遥感中未考虑海中气泡这一重要的光学散射组分。气泡在上层海洋中无处不在,由于风浪破碎而形成的微气收稿日期:2016一
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