The author thanks Dr. John Derber for valuable discussions and Dr. Rüeger for providing a copy of the manuscript on the revision of the refractive indices. I am also thankful to Drs. Louis Uccellini, Steve Lord, and John Ward for providing computer resources. I also acknowledge Mr. Dave Ector for careful proofreading, and Taiwan’s National Space Organization (NSPO) and UCAR for providing the COSMIC data. Finally, the author would like to thank both anonymous reviewers for their comments and suggestions that have significantly helped to improve the manuscript. The paper’s contents are solely the opinions of the author and do not constitute a statement of policy, decision, or position on behalf of NOAA or the U.S. government.
Bevis, M., Businger S. , Chiswell S. , Herring T. A. , Anthes R. A. , Rocken C. , and Ware R. H. , 1994: GPS meteorology: Mapping zenith wet delays onto precipitable ware. J. Appl. Meteor., 33 , 379–386.
Boudouris, G., 1963: On the index of refraction of air, the absorption and dispersion of centimeter waves by gases. J. Res. Natl. Bur. Stand., 67D , 631–684.
Cheng, C-Z(F), Kuo Y-H. , Anthes R. A. , and Wu L. , 2006: Satellite constellation monitors global and space weather. Eos, Trans. Amer. Geophys. Union, 87 , 166–167.
Cucurull, L., and Derber J. C. , 2008: Operational implementation of COSMIC observations into the NCEP’s Global Data Assimilation System. Wea. Forecasting, 23 , 702–711.
Cucurull, L., Derber J. C. , Treadon R. , and Purser R. J. , 2007: Assimilation of global positioning system radio occultation observations into NCEP’s Global Data Assimilation System. Mon. Wea. Rev., 135 , 3174–3193.
Cucurull, L., Derber J. C. , Treadon R. , and Purser R. J. , 2008: Preliminary impact studies using global positioning system radio occultation profiles at NCEP. Mon. Wea. Rev., 136 , 1865–1877.
Desroziers, G., Berre L. , Chapnik B. , and Poli P. , 2005: Diagnosis of observation, background and analysis-error statistics in observation space. Quart. J. Roy. Meteor. Soc., 131 , 3385–3396.
Hill, R. J., Lawrence R. S. , and Priestly J. T. , 1982: Theoretical and calculational aspects of the radio refractive index of water vapor. Radio Sci., 17 , 1251–1257.
Kleist, D. T., Parrish D. , Derber J. C. , Treadon R. , Wu W-S. , and Lord S. , 2009: Introduction of the GSI into the NCEP’s Global Data Assimilation System. Wea. Forecasting, 24 , 1691–1705.
Kuo, Y-H., Wee T-K. , Sokolovskiy S. , Rocken C. , Schreiner W. , Hunt D. , and Anthes R. A. , 2004: Inversion and error estimation of GPS radio occultation data. J. Meteor. Soc. Japan, 82 , 507–531.
Kursinski, E. R., Hajj G. A. , Schofield J. T. , Linfield R. P. , and Hardy K. R. , 1997: Observing Earth’s atmosphere with radio occultation measurements using the Global Positioning System. J. Geophys. Res., 102 , 23429–23465.
Melbourne, W. G., and Coauthors, 1994: The application of spaceborne GPS to atmospheric limb sounding and global change monitoring. JPL Publ. 94-18, 156 pp.
Rocken, C., and Coauthors, 1997: Analysis and validation of GPS/MET data in the neutral atmosphere. J. Geophys. Res., 102 , (D25). 29849–29866.
Rüeger, J. M., 2002: Refractive index formulae for electronic distance measurement with radio and millimetre waves. Unisurv Rep. S-68, School of Surveying and Spatial Information Systems, University of New South Wales, Sydney, NSW, Australia, 52 pp.
Smith, E. K., and Weintraub S. , 1953: The constants in the equation for atmospheric refractive index at radio frequencies. Proc. IRE, 41 , 1035–1037.