GPS profiling of the lower troposphere from space: Inversion and demodulation of the open-loop radio occultation signals

Details GPS profiling of the lower troposphere from space: Inversion and demodulation of the open-loop radio occultation signals GPS profiling of the lower troposphere from space: Inversion and demodulation of the open-loop radio occultation signals

Jul 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3314816s&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 14, CiteID L14816

Physics

16

Atmospheric Processes: Remote Sensing, Atmospheric Processes: Instruments And Techniques, Radio Science: Remote Sensing, Radio Science: Signal Processing (0674), Radio Science: Instruments And Techniques (1241)

Scientific paper

Global Positioning System (GPS) radio occultation (RO) is a space-borne remote sensing technique providing accurate, all-weather, high vertical resolution atmospheric parameters, including pressure, temperature and humidity in the troposphere and stratosphere. In the moist lower troposphere (LT) RO encounters known problem related to the phase-locked loop (PLL) tracking technique applied in standard GPS receivers and the complicated structure of LT RO signals. This problem has been overcome by developing an open-loop (OL) tracking technique. This paper outlines post-processing of OL RO data. In order to invert OL RO signals, the GPS navigation data modulation (NDM) has to be removed in post-processing. This paper demonstrates that some tropical occultations are not accurately inverted (associated refractivity inversion errors exceed 5%) without the use of externally supplied NDM bit sequences. This result has important implications for the use of RO data from future RO missions for climate research and weather forecasting.

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