简介:Inthispaper,theprincipleofH∞filteringisdiscussedandH∞filterisconstructed,whichisusedintheinitialalignmentofthestrapdowninertialnavigationsystems(SINS).TheerrormodelofSINSisderived.ByutilizingconstructedH∞filter,thefilteringcalculationtothatsystemhasbeenconducted.Thesimulationresultsofthemisalignmentanglearegivenundertheconditionofunknownnoises.TheresultsshowthattheprocessofalignmentwithH∞filterismuchfasterandwithexcellentrobustness.
简介:Inthispaper,a3Dsourcedistributiontechniqueisusedtocalculatethecoupledmotionsbetweentwoshipswhichadvanceinthewavewiththesamespeed.Thenumericalresultsofcoupledmotionsforafrigateandasupplyshiphaveagoodagreementwiththeexperimentalresults.Basedonthe3Dcoupledmotionsoftwoships,aspectralanalysisisemployedtoclearlyobservetheeffectofspeed,clearanceandwaveheadingonthesignificantrelativemotionamplitude(SRMA)oftwoships.Themethodpresentedinthispaperwillbehelpfultoselectsuitableclearance,speedandwaveheadingforunderwayreplenishmentatsea(RAS).