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Ionospheric Correction of Gps Radio Occultation Data in the Troposphere : Volume 8, Issue 7 (24/07/2015)

By Zeng, Z.

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Book Id: WPLBN0004000544
Format Type: PDF Article :
File Size: Pages 23
Reproduction Date: 2015

Title: Ionospheric Correction of Gps Radio Occultation Data in the Troposphere : Volume 8, Issue 7 (24/07/2015)  
Author: Zeng, Z.
Volume: Vol. 8, Issue 7
Language: English
Subject: Science, Atmospheric, Measurement
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Lin, J., Sokolovskiy, S., Hunt, D., Zeng, Z., Schreiner, W., & Kuo, Y. (2015). Ionospheric Correction of Gps Radio Occultation Data in the Troposphere : Volume 8, Issue 7 (24/07/2015). Retrieved from

Description: COSMIC Project Office, University Corporation for Atmospheric Research, Boulder, Colorado, USA. For inversions of the GPS radio occultation (RO) data in the neutral atmosphere, this study investigates an optimal transition height for replacing the standard ionospheric correction by the linear combination of the L1 and L2 bending angles with the correction of the L1 bending angle by the L1-L2 bending angle extrapolated from above. The optimal transition height depends on the RO mission (i.e., the receiver and firmware) and is different between rising and setting occultations and between L2P and L2C GPS signals. This height is within the range approximately 10–20 km. One fixed transition height, which can be used for the processing of currently available GPS RO data, can be set to 20 km. Analysis of the L1CA and the L2C bending angles in the presence of a sharp top of the boundary layer reveals differences that can be explained by shifts in the impact parameter. The ionosphere-induced vertical shifts of the bending angle profiles require further investigation.

Ionospheric correction of GPS radio occultation data in the troposphere

Sokolovskiy, S., Lenschow, D. H., Zeng, Z., Rocken, C., Schreiner, W. S., Hunt, D. C., Kuo, Y.-H., and Anthes, R. A.: Monitoring the depth of the atmospheric boundary layer by FORMOSAT-3/COSMIC, Presentation at 5th FORMOSAT-3/COSMIC Data Users Workshop, Taipei, Taiwan, available at: (last access: 8 May 2015), 2011.; Sokolovskiy, S. V., Schreiner, W. S., Zeng, Z., Hunt, D. C., Kuo, Y.-H., Meehan, T. K., Stecheson, T. W., Mannucci, A. J., and Ao, C. O.: Use of the L2C signal for inversions of GPS radio occultation data in the neutral atmosphere, GPS Solut., 18, 405–416, doi:10.1007/s10291-013-0340-x, 2014.; Steiner, A. K., Kirchengast, G., and Ladreiter, H. P.: Inversion, error analysis, and validation of GPS/MET occultation data, Ann. Geophys., 17, 122–138, doi:10.1007/s00585-999-0122-5, 1999.; Syndergaard, S., Lauritsen, K. B., Wilhelmsen, H., and Larsen, K. R.: Analysis of Metop/GRAS data products with new on-board tracking parameters and L2 extrapolation, Presentation at Joint OPAC-5/IROWG-3 Workshop, Leibnitz, Austria, 05–11 September, available at: (last access: 26 May 2015), 2013.; Vorob'ev, V. V. and Krasil'nikova, T. G.: Estimation of the accuracy of the atmospheric refractive index recovery from Doppler shift measurements at frequencies used in the NAVSTAR system, Phys. Atmos. Ocean, 29, 602–609, 1994.; Ware, R., Rocken, C., Solheim, F., Exner, M., Schreiner, W., Anthes, R., Feng, D., Herman, B., Gorbunov, M., Sokolovskiy, S., Hardy, K., Kuo, Y., Zou, X., Trenberth, K., Meehan, T., Melbourne, W., and Businger, S.: GPS sounding of the atmosphere from lower Earth orbit: preliminary results, B. Am. Meteorol. Soc., 77, 19–40, 1996.; Ao, C. O., Hajj, G. A., Meehan, T. K., Dong, D., Iijima, B. A., Mannucci, J. A., and Kursinski, E. R.: Rising and setting GPS occultations by use of open-loop tracking, J. Geophys. Res., 114, D04101, doi:10.1029/2008JD010483, 2009.; Culverwell, I. and Healy, S.: Ionospheric correction of RO signals by direct modeling of the ionosphere, Presentation at IROWG-2 Workshop, Estes Park, CO, USA, 28 March–03 April, available at: (last access: 4 May 2015), 2012.; Gorbunov, M. E.: Canonical transform method for processing radio occultation data in the lower troposphere, Radio Sci., 37, 1076, doi:10.1029/2000RS002592, 2002.; Gorbunov, M. E., Lauritsen, K. B., Rhodin, A., Tomassini, M, and Kornblueh, L.: Radio holographic filtering, error estimation and quality control of radio occultation data, J. Geophys. Res., 111, D10105, doi:10.1029/2005JD006427, 2006.; Hajj, G. A., Krusinski, E. R., Romans, L. J., Bertiger, W. I., and Leroy, S. S.: A technical description of atmospheric sounding by GPS occultation, J. Atmos. Sol.-Terr. Phy., 64, 451–469, doi:10.1016/S1364-6826(01)00114-6, 2002.; Healy, S. B. and Culverwell, I. D.: A modification to the ionospheric correction method used in GPS radio occultation, Atmos. Meas. Tech. Discuss., 8, 1177–1201, doi:10.5194/amtd-8-1177-2015, 2015.; Ho, S.-P., Peng, L., Anthes


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