Results 171 to 180 of about 910 (213)

Ionospheric Sounding Using GNSS-RO

2013
The GNSS signal will be bent from GNSS transmitters and LEO satellites when the signal goes through Earth’s ionosphere. With the improvement of GNSS-RO technique and more GNSS-RO missions, ionospheric parameters can be retrieved, including TEC and ionospheric electron density.
Shuanggen Jin, Estel Cardellach, Feiqin Xie   +2 more
openaire   +1 more source

Atmospheric Sensing Using GNSS RO

2013
In this chapter, the basic methodology to derive the geophysical parameters from GNSS RO refractivity will be explored in Sect. 6.1. In the following Sect. 6.2, the detailed characteristics of RO observables will be studied. The science application utilizing such RO derived geophysical parameters, spanning from atmospheric dynamic process to weather ...
Shuanggen Jin, Estel Cardellach, Feiqin Xie   +2 more
openaire   +1 more source

Development of GNSS-RO and EDTP sensors onboard microsatellite for ionosphere monitoring

2015 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), 2015
Chiba University develops two microsatellites called GAIA-I and GAIA-II. GAIA-I payload is GNSS Radio Occultation (RO) sensor and Electron Density — Temperature Probe (EDTP) for Ionosphere monitoring, and GAIA-II payload is Circularly Polarized Synthetic Aperture Radar (CP-SAR) for global land deformation monitoring.
Josaphat Tetuko Sri Sumantyo, Nobuyoshi Imura   +1 more
openaire   +1 more source

A multi-center exercise on the sensitivity of PAZ GNSS Polarimetric RO for NWP modeling

2023
A better understanding of the thermodynamics of heavy precipitation events is necessary towards improving weather and climate models and quantifying the impact of climate variability on precipitation. However, there are limited observations available to assess the thermodynamics model structure within heavy precipitation conditions.In 2009, the Earth ...
Ramon Padullés, Estel Cardellach, Antía Paz, F. Joe Turk, Chi O. Ao, Kuo Nung Wang, Manuel de la Torre Juárez, Michael J. Murphy, Jennifer S. Haase, Katrin Lonitz, Daisuke Hotta   +10 more
openaire   +1 more source

Revised GNSS‐RO observation uncertainties in the Met Office NWP system

Quarterly Journal of the Royal Meteorological Society, 2020
AbstractThe diagnostics of Desroziers et al. have been used to estimate the uncertainties of Global Navigation Satellite System Radio Occultation (GNSS‐RO) observations. Compared with the uncertainties that are currently operational, the new uncertainties are smaller and vary with height, latitude, satellite identifier, and other variables. The initial
openaire   +1 more source

The diurnal cycle of gravity waves in GNSS-RO data

Gravity wave sources such as convection are known to have a diurnal cycle, so it is expected that gravity waves should also follow a diurnal cycle. However, although this cycle can be simulated in models and observed in ground based data at fixed locations, it is difficult to observe in global satellite observations, due to their low time resolution ...
Emily Lear, Corwin Wright, Neil Hindley
openaire   +1 more source

COSMIC-2: The future of global navigation satellite system - remote observation (GNSS-RO) sensing

2010 IEEE International Geoscience and Remote Sensing Symposium, 2010
COSMIC is a joint U.S.-Taiwan 6-microsatellite demonstration mission that was launched in April 2006. It is the world's first operational GPS radio occultation (RO) mission for global Earth weather forecast; climate monitoring; atmospheric, ionospheric, and geodetic research.
Kendra Cook, Peter A. Wilczynski
openaire   +1 more source

Impact of GNSS RO Data on the Prediction of Atmospheric River Events: A ROMEX Experiment

Weather and Forecasting
Abstract The assimilation of Global Navigation Satellite Systems (GNSS) radio occultation (RO) data has been shown to improve the prediction of atmospheric rivers (ARs), which are key drivers of heavy precipitation along the U.S. West Coast. This study builds on prior research by evaluating the impact of the Radio Occultation Modeling
Hsiao-Chun Lin, Ying-Hwa Kuo, Hailing Zhang, John Braun, Zhiquan Liu   +4 more
openaire   +1 more source

Investigating equatorial waves with high-density ROMEX GNSS-RO observations

Remote sensing from satellites provides a powerful means of observing the Earth’s atmosphere with global coverage and high vertical resolution. Among these techniques, Global Navigation Satellite System radio occultation (GNSS-RO) offers a low-cost approach that delivers large volumes of high-quality atmospheric temperature profiles. While several tens
Lina Lucas, Neil Hindley, Corwin Wright, Phoebe Noble, William Randel   +4 more
openaire   +1 more source

Mountaintop GNSS-R and GNSS-RO Experiment: New Results and Insights

ION Pacific PNT, 2019
Jade Morton, Harrison Bourne, Brian Breitsch, Ian Collett, Steve Taylor, Neeraj Pujara   +5 more
openaire   +1 more source