GNSS Clock Interpolation Impacts on Radio Occultation Bending Angle Retrieval
July 6, 2017 • 590 Views
Workshop 2017 - Jan Weiss - We assess the impacts of GPS, GLONASS, and Galileo clock interpolation on retrieval of bending angle by radio occultation (RO) sensors. Using 1 Hz GPS/GLONASS clock estimates we find that bending angle error is roughly similar for all current GPS satellites (RMS 1.1 microrad), while GLONASS bending angle errors show more variation across the constellation and have an RMS of 1.9 microrad. Ground based 5 Hz tracking data from 4 receiver sites are used to evaluate higher frequency GNSS transmitter clock variations. We use a single difference carrier phase processing approach and evaluate GPS, GLONASS, and Galileo clock variations in the 1/30 Hz to 2 Hz band. Initial results indicate the higher frequency clock variations (up to 2 Hz) add about 0.4 microrad to the bending angle errors.