Articles | Volume 10, issue 1
Atmos. Meas. Tech., 10, 15–34, 2017
https://doi.org/10.5194/amt-10-15-2017
Atmos. Meas. Tech., 10, 15–34, 2017
https://doi.org/10.5194/amt-10-15-2017

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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Latest update: 18 May 2021
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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.