简介:Syntheticapertureimaginglidarisanactivenewimagingsystem,whichcanofferafinerazimuthresolutionthantheSARsystem.Anindoorsystemofsyntheticapertureimaginglidarisgiven,whichisademonstrationaboutsyntheticaperturetoimagerotatingobjects.Firstly,thebasicprincipleisintroduced.Then,thebasicmethodandkeytechniquesareanalyzed.Afterthatanimprovedsystemisgivenwiththetransmittingandthereceivinglensapartfromeachotherwhichcaneliminatetheinterferenceefficiently.Finally,theblockdiagramandtheresultofimagingsystemaregiven,whichprovethevalidityofthesystemandthefeasibilityofthesyntheticaperturetechniquesinopticaldomain.
简介:Differentialabsorptionlidar(DIAL)isanexcellenttechnologyforatmosphericCO2detection.However,theaccuracyandstabilityofatransmittedon-linewavelengtharestrictlyrequiredinaDIALsystem.Thefluctuationofatunablepulsedlasersystemisrelativelymoreseriousthanthatofotherlasersources,andthisconditionleadstoalargemeasurementerrorforthelidarsignal.Theseconcernsposeasignificantchallengeinon-linewavelengthcalibration.Thisstudyproposesanalternativemethodbasedonwaveletmodulusmaximafortheaccurateon-linewavelengthcalibrationofapulsedlaser.Becauseofthedifferentpropagationcharacteristicsofthewavelettransformmodulusmaximabetweensignalandnoise,thesingularitiesofasignalcanbeobtainedbydetectionofthelocalmodulusmaximainthewavelettransformmaximumatfinescales.Simulatedanalysisshowsthatthemethodismoreaccuratethanthegeneralmethodsuchasquinticpolynomialfittingandcansteadilymaintainhighcalibrationprecisionatdifferentsignal-to-noiseratios(SNRs).Last,16groupsofrealexperimentswereconductedtoverifythesimulatedanalysis,whichshowsthattheproposedmethodisanalternativeforaccuratelycalibratinganon-linewavelength.Inaddition,theproposedmethodisabletosuppressnoisesintheprocessofwavelengthcalibration,whichgivesitanadvantageinaccurateon-linewavelengthcalibrationwithalowSNR.
简介:摘要LiDAR——LightDetectionAndRanging,即激光探测与测量LiDAR信息采集系统着重于整合各种技术,如GPS、激光测距、INS和计算机。整个系统采集的数据,用于生产数字表面模型(DSM)、数字高程模型(DEM)、数字正射影像(DOM)、数字线划图(DLG)等产品的生产。随着机载LiDAR点云的发展,高精度、高利用率地从LiDAR点云数据中地采集建筑物边缘轮廓信息,具有重要意义。
简介:为在扫描数据的激光的特征察觉的方法自从技术的出现被学习十年了。然而,它仍然是在在不均匀的取样的点由于质地和结构信息抽取的困难处理的激光雷达数据的未解决的问题之一。纸在激光雷达数据为结构察觉分析Gaussian(日志)过滤器和它的潜在的使用的拉普拉斯算符的特征。基于木头,过滤在未组织的点上被介绍并且试验的一个特征察觉方法。方法过滤举起值(也就是,z坐标价值)由用在它的本地区域以内的日志核的卷绕旋转的每个点并且导出建议地面反对/展示的某些类型的存在的模式。实验被继续从一个邻居区域获得的点云数据集。结果证明在在定义的标准差之间的不同规模和关系检测的模式记载核和邻居尺寸,它指定被分析的本地区域。
简介:摘要其高精度、高密度、高效率、产品丰富等特点在测绘领域方面有着得天独厚的优势,将逐步替代传统测绘技术成为测量业界应用最广、最先进的测绘方法,领航测绘行业科技发展方向。笔者结合实践研究,本文介绍了机载LIDAR的测量原理、技术特点,进而总结出机载LIDAR技术优势和应用前景。