Radio Wave Propagation Phenomena from GPS Occultation Data Analysis

Pavelyev, A. G.; Matyugov, S. S.; Yakovlev, O. I.; Liou, Yuei-An; Zhang, Kefei; Wickert, Jens

doi:10.5772/55480

Cited by 1 publication

(1 citation statement)

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“…In essence, this technique involves the precise measurement of how radio waves emitted by a GPS satellite experience bending due to refractive index gradients before reaching a LEO satellite [10]. The geometric arrangement is illustrated in Figure 1, with the LEO typically positioned approximately 700 km above Earth's surface, while the GPS satellite orbits at around 22,000 km above the surface [11].…”

Section: Radio Occultation Conceptmentioning

confidence: 99%

PlanetiQ Radio Occultation: Preliminary Comparative Analysis of Neutral Profiles vs. COSMIC and NWP Models

Ahmed,

Alheyf,

Yamany

2024

Preprint

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Radio Occultation (RO) is pivotal for profiling the neutral and ionized atmosphere, with the PlanetiQ mission, via its GNOMES satellites, striving to establish an advanced atmospheric observing system. However, an assessment of the spatiotemporal distributions of PlanetiQ observations and comparisons with reliable datasets are lacking. This study addresses this gap by examining the temporal and spatial distribution of RO observations from PlanetiQ during its initial 198 operational days in 2023, alongside comparisons with COSMIC and Numerical Weather Prediction (NWP) models. Data from GN02, GN03, and GN04 satellites, yielding 1099, 1313, and 1843 RO events per day respectively, were analyzed. The satellite constellation's observations demonstrate a generally well-distributed pattern, albeit minor deficiencies in equatorial and polar regions. Single-profile comparisons with COSMIC data reveal strong correlations for pressure, temperature, Water Vapor Pressure (WVP), and refractivity profiles, with temperature exhibiting larger variations (RMSE = 1.24°C). Statistical analyses confirm statistically insignificant differences between PlanetiQ and COSMIC profiles at the same spatio-temporal coordinates. Comparisons with NWP models show slight differences with GFS, with overall RMSE values of 0.23 mb (WVP), 0.6 mb (pressure), 1.3 (refractivity), and 1.5°C (temperature). However, assessments against GFS/ECMWF models indicate overall compatibility, with insignificant differences between PlanetiQ profiles and models observations.

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Section: Radio Occultation Conceptmentioning

confidence: 99%