›› 2012, Vol. 32 ›› Issue (6): 47-53.doi: 10.3780/j.issn.1000-758X.2012.06.007

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OrbitControlforHighResolutionImagingofHong-WanArea

 ZHENG  Ai-Wu1,2,3, LIU  Yong2,3, ZHOU  Jian-Ping1   

  1. (1BeihangUniversity,Beijing100191)
    (2ScienceandTechnologyonAerospaceFlightDynamicsLaboratory,Beijing100094)
    (3BeijingAerospaceControlCenter,Beijing100094)
  • Received:2012-02-23 Revised:2012-03-29 Online:2012-12-25 Published:2012-12-25

Abstract: InordertoobtainhigherresolutionimagesofthewholelunarsurfaceandtakehighresolutionphotosofHong-Wanarea,whichisoneofthepreselectedlandingsiteofChang′E-3  (CE-3)    mission,theresolutionoftheCCDcameraofChang′E-2 (CE-2) satellitewasimproved.AndanimpulsewastakentomaneuverCE2fromtheheightof100 kmlunarcircularorbittoa100 km/15 kmellipticalorbit,whose perilune height was 15km and apolune height was 100 km tofurtherreducetheorbitalaltitudetotakephotosofHong-Wanareaneartheperilune.However,thesatellitecouldnotstayintheorbitforalongtimebecauseoftheenergylimitation.Thesunelevationoftheorbitwasalsorequiredtobehigherthan 15°forthesakeofhighqualityofimaging.Moreover,theprecisionrequirementsoforbitmeasurementanddeterminationdemandedenoughtrackingarcs.  Alltheserestrictionsbroughtforwardhighrequirementsforthedesign and control of the experiment orbit.Based on the engineering experience of Chang′E-1 mission,the characteristics of 100 km/15 km orbit with only academic stations considered to measure and control the satellite,andtwomethodswerepresentedtocalculatecontrolstrategiesoftheexperimentorbitincludingtimefixedignitionandfueloptimalmaneuveraccordingtotherequirementsoftheimagingconstraintsandorbitdetermination.Theresultsandtheerroranalysesshowthatthedesignmeetstheimagingrequirementsoftheexperimentorbit,anditisfeasiblewiththesafetyassuranceofthesatellite.

Key words: Deepspaceexploration, Orbitcontrol, Landingsite, Highresolutionimaging, Chang′E-2satellite