Articles | Volume 17, issue 20
https://doi.org/10.5194/amt-17-6213-2024
https://doi.org/10.5194/amt-17-6213-2024
Research article
 | 
24 Oct 2024
Research article |  | 24 Oct 2024

The GRAS-2 radio occultation mission

Joel Rasch, Anders Carlström, Jacob Christensen, and Thomas Liljegren

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Cited articles

Aparicio, J. M. and Deblonde, G.: Impact of the assimilation of CHAMP refractivity profiles in environment Canada global forecasts, Mon. Weather Rev., 136, 257–275, 2008. 
Bonnedal, M., Christensen, J., Carlström, A., and Berg, A.: Metop-GRAS In-Orbit Instrument Performance, GPS Solutions, 14, 109–120, https://doi.org/10.1007/s10291-009-0142-3, 2010. 
Carlström, A., Bonnedal, M., Lindgren, T., and Christensen, J.: Improved GNSS radio occultation with the next generation GRAS instrument, in: 2012 6th ESA Workshop on Satellite Navigation Technologies (Navitec 2012) & European Workshop on GNSS Signals and Signal Processing, Noordwijk, Netherlands, 5–7 December 2012, IEEE, https://doi.org/10.1109/NAVITEC.2012.6423063, 2012. 
Cucurull, L., Derber, J. C., Treadon, R., and Purser, R. J.: Assimilation of Global Positioning System radio occultation observations into NCEP's global data assimilation system, Mon. Weather Rev., 135, 3174–3193, 2007. 
Eshleman, V. R.: The radio occultation method for the study of planetary atmospheres, Planet. Space Sci., 21, 1521–1531, 1973. 
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Short summary
Soon the MetOp Second Generation (Metop-SG) series of polar orbiting meteorological satellites will be launched. On these satellites, the GRAS-2 instrument will be mounted. It will provide GNSS radio occultation measurements with unsurpassed accuracy. The occultation measurements are used routinely for numerical weather prognosis, i.e. predicting the weather. In this paper, we describe the design of this new instrument and the novel methods developed to process the data.