Abstract:AvehieularGPSeoordinatetransformationfoulaanditsworkingproeedureare theoretieallydiseussed.Rationalsimplcation15madetotheooordlnatetransformationformulaof praetiealvehielenavitionandal一timemonitoringsystems.It10shownthatthedynamiepositioning ‘euraeyOfavehieularGPSsystem15eatlydePendentonthedynamiepositioningaeeuraeyofthe hardware.Therefore,thesimplifiedformula15highlyreeommendediftheerrorscausedbyeoordinatetransformationdonotresultinobviousdeereaseind”amiePositioningaeeuraeyofaGPSsystemin whole,