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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Volume 4, issue 6 | Copyright

Special issue: Observing atmosphere and climate with occultation techniques...

Atmos. Meas. Tech., 4, 1115-1132, 2011
https://doi.org/10.5194/amt-4-1115-2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.

Review article 17 Jun 2011

Review article | 17 Jun 2011

Space and ground segment performance and lessons learned of the FORMOSAT-3/COSMIC mission: four years in orbit

C.-J. Fong1, D. Whiteley2, E. Yang1, K. Cook3, V. Chu1, B. Schreiner4, D. Ector2, P. Wilczynski2, T.-Y. Liu1, and N. Yen1 C.-J. Fong et al.
  • 1National Space Organization (NSPO), HsinChu, Taiwan
  • 2National Oceanic and Atmospheric Administration (NOAA), Silver Spring, MD, USA
  • 3C2 International, LLC, Kimball, SD, USA
  • 4University Corporation for Atmospheric Research (UCAR), Boulder, CO, USA

Abstract. The FORMOSAT-3/COSMIC (Constellation Observing System for Meteorology, Ionosphere, and Climate) Mission consisting of six Low-Earth-Orbit (LEO) satellites is the world's first demonstration constellation using radio occultation signals from Global Positioning System (GPS) satellites. The atmospheric profiles derived by processing radio occultation signals are retrieved in near real-time for global weather/climate monitoring, numerical weather prediction, and space weather research. The mission has processed, on average, 1400 to 1800 high-quality atmospheric sounding profiles per day. The atmospheric radio occultation data are assimilated into operational numerical weather prediction models for global weather prediction, including typhoon/hurricane/cyclone forecasts. The radio occultation data has shown a positive impact on weather predictions at many national weather forecast centers. A follow-on mission was proposed that transitions the current experimental research mission into a significantly improved real-time operational mission, which will reliably provide 8000 radio occultation soundings per day. The follow-on mission, as planned, will consist of 12 LEO satellites (compared to 6 satellites for the current mission) with data latency requirement of 45 min (compared to 3 h for the current mission), which will provide greatly enhanced opportunities for operational forecasts and scientific research. This paper will address the FORMOSAT-3/COSMIC system and mission overview, the spacecraft and ground system performance after four years in orbit, the lessons learned from the encountered technical challenges and observations, and the expected design improvements for the spacecraft and ground system for FORMOSAT-7/COSMIC-2.

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