atmospheric polarimetric effects on gnss radio occultations: the rohp-paz field campaign
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2016
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Abstract
This study describes the first experimental observations showing that
hydrometeors induce polarimetric signatures in global navigation satellite
system (GNSS) signals. This evidence is relevant to the PAZ low Earth
orbiter, which will test the concept and applications of polarimetric GNSS
radio occultation (RO) (i.e. ROs obtained with a dual-polarization antenna). A
ground field campaign was carried out in preparation for PAZ to verify the
theoretical sensitivity studies on this concept (Cardellach et al., 2015).
The main aim of the campaign is to identify and understand the factors that
might affect the polarimetric GNSS observables. Studied for the first time,
GNSS signals measured with two polarimetric antennas (H, horizontal, and
V, vertical) are shown to discriminate between heavy rain events by comparing the
measured phase difference between the H and V phase delays (ΔΦ) in different weather scenarios. The measured phase difference
indicates higher dispersion under rain conditions. When individual events are
examined, significant increases in ΔΦ occur when the radio signals
cross rain cells. Moreover, the amplitude of such a signal is much higher than
the theoretical prediction for precipitation; thus, other sources of
polarimetric signatures have been explored and identified. Modelling of other
hydrometeors, such as melting particles and ice crystals, have been proposed to
explain the obtained measurements, with good agreement in more than 90 % of
the cases.
| Reference Key |
padulls2016atmosphericatmospheric
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|---|---|
| Authors | ;R. Padullés;E. Cardellach;M. de la Torre Juárez;S. Tomás;F. J. Turk;S. Oliveras;C. O. Ao;A. Rius |
| Journal | Journal of agricultural and food chemistry |
| Year | 2016 |
| DOI |
10.5194/acp-16-635-2016
|
| URL | |
| Keywords |
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