简介:Inthispaper,theprincipleofH∞filteringisdiscussedandH∞filterisconstructed,whichisusedintheinitialalignmentofthestrapdowninertialnavigationsystems(SINS).TheerrormodelofSINSisderived.ByutilizingconstructedH∞filter,thefilteringcalculationtothatsystemhasbeenconducted.Thesimulationresultsofthemisalignmentanglearegivenundertheconditionofunknownnoises.TheresultsshowthattheprocessofalignmentwithH∞filterismuchfasterandwithexcellentrobustness.