The Copernicus POD Service

Fernández, Jaime; Peter, Heike; Fernández, Carlos; Berzosa, Javier; Fernández, Marc; Bao, Luning; Muñoz, Miguel Ángel; Lara, Sonia; Terradillos, Eva; Féménias, Pierre; Nogueira, Carolina

doi:10.1016/j.asr.2024.02.056

Cited by 3 publications

(2 citation statements)

References 51 publications

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“…The comparison of the GNSS-POD solution with the RO-POD solution provides a receiver-independent way to crosscheck the solution (of course the clock solution in this case cannot be compared, given that the two receivers have different oscillators). Furthermore, the GNSS-POD-based solution itself is routinely compared with solutions obtained by the members of the Copernicus POD quality working group (Fernández et al, 2024), which EUMETSAT is part of. The above checks allow to perform several complementary S/W-, receiver-, and processing-center-independent cross comparisons to validate our solution.…”

Section: Podmentioning

confidence: 99%

“…The RINEX observation files, decoded from level zero data provided by the RO receiver at the rate of 1 s, are downsampled to 30 s when using JPL products and to 10 s when using CODE products. With 5 s clocks, one could also employ 5 s RINEX data, but it has been shown that not much is gained in this case, and the GNSS-POD receiver provides data at the rate of 1 and 10 seconds for carrier-phase and pseudo-range, respectively (Fernández et al, 2024). In the POD processing, using a RINEX data rate higher than the clock data rate of the GNSS products would not be beneficial, but would rather increase the noise of the solution (Dach et al, 2015).…”

Section: Podmentioning

confidence: 99%

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Observed impact of the GNSS clock data rate on Radio Occultation bending angles for Sentinel-6A and COSMIC-2

Padovan,

Von Engeln,

Paolella

et al. 2024

Preprint

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Abstract. Space-based Radio Occultation (RO) experiments currently require the tracking of signals from the Global Navigation Satellite System (GNSS) by a Low-Earth-Orbit (LEO) satellite as the signals travel through different layers of the atmosphere. The orbit and clock solutions for the GNSS constellations affect these experiments in two ways: They are needed to obtain a zero-differencing GNSS-based orbit and clock solution for the LEO, and they enter directly the processing of each single radio occultation profile, where the orbit and clock information for the transmitter (GNSS satellite) and receiver (LEO) is required. In this work, we investigate how different GLONASS and GPS orbit and clock solutions affect the statistical properties of RO profiles by comparing our results with forward-modelled bending angle profiles obtained from the European Centre for Medium-Range Weather Forecasts (ECMWF) short-range forecasts. Given that GNSS orbits are relatively smooth, the focus will be on the effect of different transmitter clock data rates, and we tested the range from 1 to 30 seconds. The analysis is based on the reprocessing of Sentinel-6A data (four months in 2021, or about 110k occultations) and of a smaller sample of recent COSMIC-2/FORMOSAT-7 data (about 9k occultations). We find that at impacts heights above about 35 km GLONASS bending angles statistics markedly improve with the use of high-rate clock information. For GPS, not much is gained by using rates higher than 30 s, and the statistics are better for more recent GPS blocks. These results are likely the manifestation of the different short-timescale behaviour of the atomic clocks onboard the GPS and GLONASS constellations.

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Section: Podmentioning

confidence: 99%

Section: Podmentioning

confidence: 99%