关键词: 全球卫星导航系统, 兼容性, 相关器, 评估, 等效载噪比, 频谱隔离系数

Abstract: Sofar,computersimulationisthemainevaluationmethodforthecompatibilityperformanceofthesatellitenavigationsignals.Themodelingwasusedtosimulatethemeasuringconditionandstep，butitisimpossibletoreproducetheoperatingconditionoftherealnavigationsystem.Anyparameterchangewillleadtotheresimulation，averylargeamountofcomputationandanalysis，andlargeerrors.Basedonthesatellitenavigationreceiver，thecompatibilityofthenavigationsignalwasstudied.Firstly,themodelwasdeducedbytheratiooftheoutputsignalpowerofinstantcorrugatortothesumofthenoisepowerandtheinterferencepower，accordingtotheeffectoftheinterferencesignalonGNSSreceivercapture，carriertrackinganddataconditioning.Toobtaintheoptimalassessmentoftheinference，theequivalentcarriertonoiseratiomodelwasestablishedbyarelativelysimpleformula，basedonaspectralisolationfactor.Secondly，thepower，theantennagainandtheconstellationpowergainofthenavigationsignalswereanalyzedconcretelywhensignalarrivedatthegroundastheGPSC/Acodeself-disturbed.Finally，theattenuationtestingresultoftheequivalentcarriertonoiseratiowasshownwhentheGPSC/Acodeself-disturbed.Itprovidesreferenceforthesignaldesignofthenewsatellitenavigationsystem.

Key words: Globalsatellitenavigationsystem, Compatibility, Assessment, EquivalentCNR, Spectrumseparationcoefficient