A Near-Real-Time Automatic Orbit Determination System for COSMIC and Its Follow-On Satellite Mission: Analysis of Orbit and Clock Errors on Radio Occultation

Li, Yi-Shan; Hwang, Cheinway; Tseng, Tzu-Pang; Huang, Cheng-Yung; Bock, Heike (2014). A Near-Real-Time Automatic Orbit Determination System for COSMIC and Its Follow-On Satellite Mission: Analysis of Orbit and Clock Errors on Radio Occultation. IEEE transactions on geoscience and remote sensing, 52(6), pp. 3192-3203. Institute of Electrical and Electronics Engineers IEEE 10.1109/TGRS.2013.2271547

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The 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 (URCA) system. The mean velocity accuracy from the NRT orbits of COSMIC is 0.168 mm/s, corresponding to an error of about 0.051 μrad 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 μrad .

Item Type:

Journal Article (Further Contribution)

Division/Institute:

08 Faculty of Science > Institute of Astronomy

UniBE Contributor:

Bock, Heike

Subjects:

500 Science > 520 Astronomy

ISSN:

0196-2892

Publisher:

Institute of Electrical and Electronics Engineers IEEE

Language:

English

Submitter:

Pierre Fridez

Date Deposited:

19 Jun 2014 10:19

Last Modified:

05 Apr 2017 15:54

Publisher DOI:

10.1109/TGRS.2013.2271547

BORIS DOI:

10.7892/boris.46141

URI:

https://boris.unibe.ch/id/eprint/46141

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