›› 2015, Vol. 35 ›› Issue (1): 75-83.doi: 10.3780/j.issn.1000-758X.2015.01.010

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AnImprovedPseudoliteLocationModelofGPS/PseudoliteIntegratedPositioning

LIUChao,LINPeng,ZHANGJingxia,ZHAOXingwang   

  1. (SchoolofGeodesyandGeomatics,AnhuiUniversityofScience&Technology,Huainan232001)
  • Received:2014-06-05 Revised:2014-09-12 Online:2015-02-25 Published:2015-02-25

Abstract: InordertoimprovethegeometrystructureofGPSsatellitesandtheprecisionofGPS/pseudolitesintegratedrelativepositioning,fundamentaltheoriesbetweenGPSandpseudolitewerecompared.Then,thecorrespondingformulaswereillustrated,andthenecessityofthepseudoliteapplicationwasexplained.Afour-dimensionallocationmodelwasproposed,takingthedilutionofprecision(DOP)asthedependentvariableandtheparametersoftime,azimuthandelevationangleastheindependentvariables,andtheconcretestepstotheapplicationofthemodelwasgiven.Inaddition,aonestepadditionmethodofpseudolitewasgiventoimprovethemulti-stepone,andthepositiondilutionofprecision(PDOP)wastakenastheevaluationindex. Theresultsindicatethatthetwoadditionmannerscanrealizetheoptimalpseudolitelocationanddramaticallyimprovethereliabilityandefficiencyofthepseudolitelocation.And,thenewone-stepmethodissuperiortothemulti-stepone,especiallyforthecaseoftwopseudolitesaddition.ThenewmethodcanprovidemoreeffectivelocationschemeswiththePDOPdecreasingbyover1.0insomeunfavourableareas.

Key words: GlobalPositioningSystem, Pseudolite, Dilutionofprecision, Optimallocation, Integratedpositioning, Relativepositioning