Abstract: Whenrunningchannelsimulationsystemsforsatellitenavigationsystemsimulation,thezerovaluedriftofenvironmentsimulationchannelswillcausesystemerrorwhichcannotbeeliminated,soit′snecessarytotakeonlinechannelzerovaluecalibrationduringthesimulation.Traditionalzerovaluecalibrationmethodbasedonthedirectsequence spreadspectrum(DSSS)delaycalibrationreceivercannotdistinguishbetweensetting simulatedspacepropagationdelayandthechannelzerovalue,anditcan′tsuppressmultipleaccessinterference.Basedonthechangingmechanismofspacepropagationdelaysimulatedbytheenvironmentsimulationchannel,amethodwhichcandistinguishbetweenthechannelzerovalueandsettingsimulatedspacepropagationdelaywasdescribed.Themultipleaccessinterferenceintensityandthesuppressionmethodswerealsoanalyzed.Thetheoreticalanalysisandsimulationshowthattheprecisionoftheproposedonlinedelaycalibrationmethodislessthannanoseconds.

Key words: Channelsimulationsystem, Delaycalibrationreceiver, Onlinedelaycalibration, Multipleaccessinterference, Satellitenavigationsystem