›› 2016, Vol. 36 ›› Issue (5): 25-.doi: 10.16708/j.cnki.1000-758X.2016.0054

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ThealgorithmandvalidationofBeiDousystem

WANG  Yuan-Xin, CAO  Yue-Ling, HU  Xiao-Gong, HUANG  Yong, TANG  Cheng-Pan   

  1. 1ShanghaiAstronomicalObservatory,ChineseAcademyofSciences,Shanghai200030,China
    2UniversityofChineseAcademyofScience,Beijing100049,China
  • Received:2015-12-25 Revised:2016-03-25 Online:2016-10-25 Published:2016-06-30

Abstract: Currently,thedesignofintegrityparametersforthesatellitebasedaugmentationsystemofBDSislackofdegradationparametersforthedifferentialinformation′savailability,andcan′tsatisfytheRTCAprotocol.SothesatellitebasedaugmentationsystemofBDSisnotcompatibletotheotherinternationalsatellitebasedaugmentationsystemofGNSS.TheintegritydegradationparametersofBDSweredesignedaccordingtotheRTCAprotocol,andtheeffectontheuserpositioningwasanalyzedbyusingtheBDSmeasureddata.Basedonthese,theeffectivenessofthisalgorithmwasdemonstrated.Theresultsshowthat,thelocationprecisionoftheaugmentationsystemforBDSreaches113m.However,iftheuserfailedtoreceivesomedifferentialcorrection,thepositioningprecisionreaches144m,decreasesby274%approximately.Inthissituation,byoptimizingpositionmatrixwiththeintegrityparameterstothepastdifferentialmessage,thepositioningprecisionwillincreaseto117m,sotheauthorizedservicewillrecover.

Key words: satellitebasedaugmentationsystem, RadioTechnicalCommissionforAeronauticsprotocol, integrity, degredation, BeiDounavigationsystem;positioning