Comparison of GPS estimates of wet tropospheric delays with WVR measurements

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dc.acquisition-srcDownloaded from-Engineering Village 2en_US
dc.call-noen_US
dc.contract-noen_US
dc.contributor.authorNam YSen_US
dc.contributor.authorDa Ken_US
dc.contributor.authorSchutz BEen_US
dc.contributor.otheren_US
dc.date.accessioned2010-02-15T17:16:17Z
dc.date.available2010-02-15T17:16:17Z
dc.date.issued1996en_US
dc.degreeen_US
dc.description641-646en_US
dc.description-otheren_US
dc.description.abstractIn March of 1995, a 5 day GPS campaign with Water Vapor Radiometer (WVR) and surface meteorological (SM) measurements was carried out at Eagle Point, located on Galveston Bay, and at the McDonald Observatory, near Fort Davis, Texas. GPS measurements from the experiment sites and two additional International GPS Service (IGS) stations (Pie Town, New Mexico and Richmond, Florida) were processed together using the TEXGAP software package developed at the University of Texas at Austin, Center for Space research (CSR). Tropospheric zenith wet delays at the experiment sites were estimated as an average value over one hour intervals while zenith hydrostatic delays were computed from SM data. During the processing, GPS orbits were fixed to the precise ephemerides determined by CSR and the coordinates of the McDonald site were fixed to the ITRF93 frame as fiducial. Comparison of the GPS estimated zenith wet delays with those from WVR over the 5 day period shows an RMS accuracy of about 7-8 mm, which is about 1 mm in precipitable water vapor (PWV). Daily accuracy of GPS estimates shows 6 mm (better than 1 mm in PWV) at McDonald. But when azimuthal variation of tropospheric wet delay is extremely high, there is less agreement between GPS estimates and the WVR measurements. Error sources for an observed bias difference between GPS estimates and WVR measurements were identified as GPS orbit errors (2-3 mm) and fiducial coordinates error (2 mm)en_US
dc.description.urihttp://gbic.tamug.edu/request.htmen_US
dc.historyen_US
dc.identifier.urihttp://hdl.handle.net/1969.3/23328
dc.latitudeen_US
dc.locationen_US
dc.longitudeen_US
dc.notesCompilation and indexing terms, Copyright 2004 Elsevier Engineering Information, Incen_US
dc.placeKansas City, MO, USAen_US
dc.publisherInst of Navigation, Alexandria, VA, USAen_US
dc.relation.ispartofseries50927.00en_US
dc.relation.urien_US
dc.scaleen_US
dc.seriesProceedings of ION GPSen_US
dc.subjectComputer simulationen_US
dc.subjectGlobal positioning systemen_US
dc.subjectMeteorologyen_US
dc.subjectParameter estimationen_US
dc.subjectRadiometersen_US
dc.subjectTexasen_US
dc.subjectTroposphereen_US
dc.subjectWateren_US
dc.titleComparison of GPS estimates of wet tropospheric delays with WVR measurementsen_US
dc.typeCONFen_US
dc.universityen_US
dc.vol-issue1()en_US

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