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dc.contributor.authorLi, Yi-Shanen_US
dc.contributor.authorHwang, Cheinwayen_US
dc.contributor.authorTseng, Tzu-Pangen_US
dc.contributor.authorHuang, Cheng-Yungen_US
dc.contributor.authorBock, Heikeen_US
dc.date.accessioned2014-12-08T15:35:18Z-
dc.date.available2014-12-08T15:35:18Z-
dc.date.issued2014-06-01en_US
dc.identifier.issn0196-2892en_US
dc.identifier.urihttp://dx.doi.org/10.1109/TGRS.2013.2271547en_US
dc.identifier.urihttp://hdl.handle.net/11536/23937-
dc.description.abstractThe COSMIC-2 mission is a follow-on mission of the Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC) with an upgraded payload for improved radio occultation (RO) applications. The objective of this paper is to develop a near-real-time (NRT) orbit determination system, called NRT National Chiao Tung University (NCTU) system, to support COSMIC-2 in atmospheric applications and verify the orbit product of COSMIC. The system is capable of automatic determinations of the NRT GPS clocks and LEO orbit and clock. To assess the NRT (NCTU) system, we use eight days of COSMIC data (March 24-31, 2011), which contain a total of 331 GPS observation sessions and 12 393 RO observable files. The parallel scheduling for independent GPS and LEO estimations and automatic time matching improves the computational efficiency by 64% compared to the sequential scheduling. Orbit difference analyses suggest a 10-cm accuracy for the COSMIC orbits from the NRT (NCTU) system, and it is consistent as the NRT University Corporation for Atmospheric Research (UCAR) system. The mean velocity accuracy from the NRT orbits of COSMIC is 0.168 mm/s, corresponding to an error of about 0.051 mu rad in the bending angle. The rms differences in the NRT COSMIC clock and in GPS clocks between the NRT (NCTU) and the postprocessing products are 3.742 and 1.427 ns. The GPS clocks determined from a partial ground GPS network [from NRT (NCTU)] and a full one [from NRT (UCAR)] result in mean rms frequency stabilities of 6.1E-12 and 2.7E-12, respectively, corresponding to range fluctuations of 5.5 and 2.4 cm and bending angle errors of 3.75 and 1.66 mu rad.en_US
dc.language.isoen_USen_US
dc.subjectConstellation Observing System for Meteorologyen_US
dc.subjectIonosphereen_US
dc.subjectand Climate (COSMIC)en_US
dc.subjectCOSMIC-2en_US
dc.subjectGPSen_US
dc.subjectorbit determination (OD)en_US
dc.subjectradio occultation (RO)en_US
dc.titleA Near-Real-Time Automatic Orbit Determination System for COSMIC and Its Follow-On Satellite Mission: Analysis of Orbit and Clock Errors on Radio Occultationen_US
dc.typeArticleen_US
dc.identifier.doi10.1109/TGRS.2013.2271547en_US
dc.identifier.journalIEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSINGen_US
dc.citation.volume52en_US
dc.citation.issue6en_US
dc.citation.spage3192en_US
dc.citation.epage3203en_US
dc.contributor.department土木工程學系zh_TW
dc.contributor.departmentDepartment of Civil Engineeringen_US
dc.identifier.wosnumberWOS:000332504700013-
dc.citation.woscount0-
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