简介:车载LiDAR系统具有能快速测定道路、随时上路施测及费用较低等优势,其测距精度可达5mm,综合测点精度达到cm级,系统采用了先进的直接惯导辅助定位技术(DIA),有效解决了GPS信号失锁的问题。通过电网GIS空间信息服务平台建设配网数据采集工作的验证,证明了在城区电力专题数据采集过程中,车载LiDAR系统能够满足相关规范的要求。
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。