Abstract: Forthesatelliteconstellationnetwork,changesinrealtimeofnetworktopologyandfrequentlyhandoverofISLhavebadimpactsontheroutingperformance.Basedonthebackboneandaccessionstheoryandtheweakconnectiontheory,anewdoublelayeredsatelliteconstellationnetworkstructurewasproposed,whichcanhelptheadministrationforeachlayer.Moreover,anewroutingalgorithm,namedEDRA,wasproposed.Theroutingalgorithmimprovesthemethodofequallengthintervalsnapshotsbyadjustingthepolarboundarydynamicallyandadoptingthenewideaoflayeredmanagement.Theanalysisandsimulationsshowthatthenewsatelliteconstellationnetworkstructureismoresensible,thenumberofsnapshotsoftheEDRAalgorithmisonlythehalfoftheVLRAalgorithm,andtheaveragedurationofsnapshotsismorethanthreetimesoftheVLRAalgorithm.TheEDRAalgorithmcanreducethenumberofcalculationandupdatingoftherouting,improvetheutilizationofnetworkISL,reducethedelayjitterandpacketlossrate.

Key words: GEO/LEOdoublelayeredsatelliteconstellationnetwork;, Equallengthintervalsnapshots, Onboarddistributedroutingalgorithm, Dynamicallyadjustthepolarboundary, Simulation