关键词: 敏捷卫星, 积分时间, 速高比, 数字高程模型, 数管分系统

Abstract: Traditionalintegraltimecalculationmodelscan′tsatisfytheaccuracyrequirement,becauseattitudeflexibilityandintegraltimechangeseverelyduringtheimagingofagilesatellite.Anintegraltimecalculationmodelwasproposedtoimprovetheaspectsofgroundvelocitycalculationofimagingpointandheightcalculationfromsatellitetogroundpoint.Digitalelevationmodelwasadoptedtocorrectheightvalueforheightcalculationfromsatellitetogroundpoint.Andtheattitudeangularvelocity′simpacttoangularvelocityvectorinthesatellitebodycoordinatesystemwasconsideredwhencalculatedthegroundvelocityatimagingpoints.ThewholealgorithmimplementationonOBDHsubsystemwasdesignedandsimulationcalculationundertheembeddedenvironmentwasconducted.Theanalysisresultsmanifeststhemethodcanmeettheaccuracyrequirementofagilesatellitecameraimagingqualitysincethedifferenceiswithin001‰bycomparisonwithSTKsimulationcalculationresults.

Key words: agilesatellite, integraltime, velocity-heightratio, digitalelevationmodel（DEM）, OBDHsubsystem