Articles | Volume 10, issue 1
Atmos. Meas. Tech., 10, 15–34, 2017
Atmos. Meas. Tech., 10, 15–34, 2017

Research article 03 Jan 2017

Research article | 03 Jan 2017

Open-loop GPS signal tracking at low elevation angles from a ground-based observation site

Georg Beyerle and Florian Zus

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F. Zus, G. Beyerle, S. Heise, T. Schmidt, and J. Wickert
Atmos. Meas. Tech. Discuss.,,, 2014
Preprint withdrawn

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Cited articles

Anderson, K. D.: Determination of water level and tides using interferometric observations of GPS signals, J. Atmos. Ocean. Tech., 17, 1118–1127,<1118:DOWLAT>2.0.CO;2, 2000.
Ao, C. O., Meehan, T. K., Hajj, G. A., Mannucci, A. J., and Beyerle, G.: Lower-troposphere refractivity bias in GPS occultation retrievals, J. Geophys. Res., 108, 4577,, 2003.
Ao, C. O., Hajj, G. A., Meehan, T. K., Dong, D., Iijima, B. A., Mannucci, A. J., and Kursinski, E. R.: Rising and setting GPS occultations by use of open-loop tracking, J. Geophys. Res., 114, D04101,, 2009.
Axelrad, P., Larson, K., and Jones, B.: Use of the correct satellite repeat period to characterize and reduce site-specific multipath errors, in: Proceedings of the 18th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2005), 2638–2648, IEEE, Long Beach, CA, 2005.
Short summary
Ground-based observations of GPS satellites disappearing below the local horizon are analysed. Starting at +2 degree elevation angle the GPS signals are recorded in open-loop tracking mode down to −1.5 degrees. The open-loop Doppler model has negligible influence on the derived data products for strong signal-to-noise ratios; at lower signal levels, however, a notable bias is uncovered. These results may have implications for the design of future space-based GPS radio occultation missions.