Zerotech DOBBY - Positioning Systems; GPS Positioning; Optic Flow and Ultrasonic Wave Positioning

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零度智控（北京）智能科技有限公司
GPSPositioning
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Theaircraf tusesaGPS/GLONASSdual satellitepositionin gsystem.The satellitepositioningsystemis
GPSbased,wi th GLONASSactingasasupplementarysystem.
Duringoutdoorflight,theaircraftusesGPSpositioningwhenithasfoundaGPSsatellitenumber
largerthan7.
OpticFlowandUltrasonicWavePositioning
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Theaircraftwillusetheopticflowandultrasonicwavepositioningduringindoor
flight.IftheGPSsignalispoorduringoutdoorflight(ifthesatellitenumber
foundissmallerthan6),thentheaircraftwillautomaticallyswitchtoopticflow
andultrasonicwavepositioning.
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Theopticflowandultrasonicwavepositioningsystemcombinesmotionanalysis
tohorizontallypositiontheaircraftduringflightandanultrasonicdistance
measurertodeterminethedistancefromtheground.Itpositionstheaircraft
duringindoorflightandassiststheGPSpositioningsystemduringoutdoorflight.
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Theopticflowandultrasonicwavepositioningmoduleislocatedonthebaseof
theaircraft.Itconsistsofanopticalflowcameraandanultrasonicwavesensor.
UsageConditionsandRestrictions
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Theopticflowandultrasonicwavepositioningsystemisusedforindoorflight.Itisalsousedforoutdoorflightif
theGPSsignalisweak.Theoperatingheightrangeforthispositionin
gsystemis0.5‐3m.
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Whenusingthispositioningsystem,aftertheaircrafthasbegunflyingandascendedto0.5m,itwilldetermineif
therequirementsforusingthissystemhavebeenmet.Iftheyhavenot,itwillinitiatelanding.Iftherequirements
arenotmetforthissystemduringflight,theaircraftwillalsoinitiatelanding.
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Requirementsfortheopticflowandultrasonicwavepositioningsystem:Whenusingthissystem,thearea
underneaththeaircraftneedsbehaveanoticeabletexturedsurface.Userscanputasquareclothontheground,
tableoroveranylarge,flatsurfacetoprovidetherequiredtexturedsurface.
Theopticflowandultrasonicwavepositioningsystemmaynot
workunderthesecircumstances,pleaseusecarefully:
 Aboveuniformly‐colouredsurfaces(Likecompletelyblack,whiteetc.);
 Abovestronglyreflectiveorinvertedsurfaces;
 Abovewaterorclearobjects;
 Abovepeopleormovingobjects;
 Areaswithrapidlychanging/flashinglights;