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1、TrajectoryVisualizationwithGPS 轨迹可视化 Name XXX Date Dec 5 2018 第2页 竢实扬华 自强不息 2018ChongqingBusCrash 第3页 竢实扬华 自强不息 CONTENT 1 TheDefinitionofGPS TrajectoryVisualizationwithGPS 3 2 ThePrincipleofGPS 第4页 竢实扬华 自强不息 1 TheDefinitionofGPS Definition Satellite basedRadionavigationSystemOwnedbyUnitedStatesGloba
2、lNavigationSatelliteSystem GNSS GeolocationandTimeInformation FourSatellites 第5页 竢实扬华 自强不息 第5页 竢实扬华 自强不息 2 ThePrincipleofGPS Monitor Control SendSignals SendSignals 2 ThePrincipleofGPS Fig 1AVisualExampleof24GPSSatellitesinMotionwiththeEarthRotating Table 1PositioningAccuracyofGPSinCivilUses 民用 Mili
3、taryUses SecrettothePublic 第7页 竢实扬华 自强不息 3 TrajectoryVisualizationwithGPS DispatchControlCenterofPublicTransportation 公交调度控制中心 Q A 1 Goodmorningladiesandgentlemen I mXXX TodayI mgoingtointroducesomethingabouttrajectoryvisualizationwithGPStoyou 2 Firstlet sfocusontheChongqingbuscrashhappenedabout1mon
4、thago It ssuchatragedythateveryonefeelssorrowfulandangry Sohowtocontrolandreducethelossoftrafficaccidents Inmyopinions trajectoryvisualizationwithGPSisoneofthebestchoices 3 I lltalkaboutmytopicinthreeaspects thedefinitionandprincipleofGPSandtrajectoryvisualization 4 IbelievethateveryoneknowsofGPS Bu
5、twhatexactlyisGPS Let sseethedefinition TheGlobalPositioningSystem alsoknownasGPS isasatellite basedradionavigationsystemownedbytheUnitedStatesgovernmentandoperatedbytheUnitedStatesAirForce ItisaglobalnavigationsatellitesystemthatprovidesgeolocationandtimeinformationtoaGPSreceiveranywhereonornearthe
6、EarthwherethereisanunobstructedlineofsighttofourormoreGPSsatellites 5 GPScanbedividedintothreesegments Firstisthespacesegment Itiscomposedof24satellitesin6orbitsgoingaroundtheearthevery12hours Thespacesegmentisresponsibleforsendingsignalstoothertwosegments Secondisthecontrolsegment Itiscomposedof1ma
7、stercontrolstation 5monitorstationsand3groundantennas Theuseofcontrolsegmentistomonitorandcontroltheworkingconditionsofsatellites Thirdistheusersegment That swhatweoftenuseinourdailylife ThecoreofthispartareGPSreceivers WithGPSreceivers wecangetthegeolocationofwhereweare Andherearethebriefrelationsh
8、ipsamongthethreesegments It sobviousthattheyarecloselycorrelatedwitheachother 6 Hereisavisualexampleof24GPSsatellitesinmotionwiththeearthrotating Withthisanimation wecanunderstandtheworkingprocessofGPSeasily AnotherissuethatweconcernaboutisthepositioningaccuracyofGPS WecanseetheaccuracyoftwotypesofG
9、PSincivilusesinthistable Asyouexpect differentialGPSismorefrequentlyusedinourdailylife Afterknowingtheaccuracyinciviluses youmaywondertheaccuracyinmilitaryuses Unfortunately onlyUSmilitarythemselvesknowthedetails 7 Finally wecometothekeypoint trajectoryvisualization Justaswecanseefromthepictures The
10、greenlinerepresentstheestablishedrouteofthebus Andtheredlinerepresentstherealrouteofthebus Iftheredlineandgreenlineoverlap thatmeanseverythinggoeswell Otherwise theremaybesomethingunexpectedhappening Withtrajectoriesvisualizedonscreen thedispatchcontrolcenterofpublictransportationcanrespondtoanysituationsimmediatelywithoutbeinglatetocatchon Thus thelosswillbereduceddramatically
