The proof of concept for 3-cm Altimetry using the Paris Interferometric Technique

© 2010 IEEE. Reprinted, with permission, from Nogués, O., Ribó, S., Arco, J. C., Cardellach, E., Rius, A., València, E., A. Camps, van der Marel, H., Martín-Neira, M., The proof of concept for 3-cm altimetry using the PARIS interferometric technique, Proceedings of IEEE International Geoscience and Remote Sensing Symposium (IEEE IGARSS), and july/2010. This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of CSIC products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to [email protected]. By choosing to view this document, you agree to all provisions of the copyright laws protecting it.Peer reviewe

Tomografía estocástica de la distribución de electrones ionosféricos

[EN] We present two techniques of stochastic tomography of the ionosphere, useful for the study of its electron density distribution. The basic observables are the differential delays experienced by two signals emitted by a member of the Global Navigation Satellite System constellations collected by receivers onboard Low Earth Orbiter satellites. We discuss the Abel transform approach as a two-dimensional tomographic technique useful when the spherical symmetry assumption holds, and a more general four-dimensional tomographic approach. Finally, we apply these analysis tools to data collected onboard the Danish satellite Oersted.[ES] Se presentan dos procedimientos de tomografía estocástica para el análisis de la densidad electrónica de la ionosfera. El mecanismo de sondeo es el análisis del tiempo de retardo en la propagación de las señales de radio de los sistemas de posicionamiento global. En primer lugar, se discuten las técnicas basadas en la Transformación de Abel, que son de aplicación cuando existe simetría esférica en la distribución. Seguidamente, se discuten las técnicas tomográficas, que permiten mayor libertad en la elección de las hipótesis sobre la presencia de simetrías en el sistema.Peer reviewe

Tropospheric Information Content Embedded in GNSS RO Reflected Signals

5 páginas. International Beacon Satellite Symposium (2010 : Barcelona, Espanya)This work presents the studies being conducted on the retrieval of tropospheric information from GNSS Radio-Occultation signals reflected off of the Earth’s surface.Peer reviewe

Polarimetric GNSS Radio-Occultations for heavy rain detection

© 2010 IEEE. Reprinted, with permission, from Cardellach, E., Rius, A., Cerezo, F., Garcia-Primo, M.A., de la Torre-Juarez, M., Cucurull, L., Ector, D., Polarimetric GNSS Radio-Occultations for heavy rain detection, Proceedings of IEEE International Geoscience and Remote Sensing Symposium (IEEE IGARSS), and july/2010. This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of CSIC products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to [email protected]. By choosing to view this document, you agree to all provisions of the copyright laws protecting it.A Global Navigation Satellite System (GNSS) Radio-Occultation (RO) experiment is being accommodated in the Spanish Low Earth Orbiter (LEO) for Earth Observation PAZ. The RO-payload will provide globally distributed vertical thermodynamic profiles of the Atmosphere in Near Real-Time (NRT) suitable to be assimilated into Weather Numerical Prediction Models. The NRT operability will be dispensed by the Ground Segment services of the U.S.A. National Oceanographic and Atmospheric Administration (NOAA). Moreover, the mission will run, for the first time from Space, a double-polarization GNSS experiment, to assess the capabilities of polarimetric GNSS-RO for detection of heavy rain events.Peer reviewe

Experimental evaluation of GNSS-reflectometry altimetric precision using the P(Y) and C/A signals

This work describes a novel dual-band Global Navigation Satellite Systems Reflectometer (GNSS-R) that uses the P(Y) and C/A signals scattered over the sea surface to perform highly precise altimetric measurements. The results derived from two different ground-based field experiments over a dam and over the sea under different surface's roughness conditions are presented. The analysis of the altimetric performance shows that the results obtained using the P(Y) code improve by a factor between 1.4 and 2.4 as compared to the results obtained using the C/A code, respectively, for high and mid-low satellite's elevation angles.Peer ReviewedPostprint (published version

Experimental evaluation of GNSS-reflectometry altimetric precision using the P(Y) and C/A signals

This work describes a novel dual-band Global Navigation Satellite Systems Reflectometer (GNSS-R) that uses the P(Y) and C/A signals scattered over the sea surface to perform highly precise altimetric measurements. The results derived from two different ground-based field experiments over a dam and over the sea under different surface's roughness conditions are presented. The analysis of the altimetric performance shows that the results obtained using the P(Y) code improve by a factor between 1.4 and 2.4 as compared to the results obtained using the C/A code, respectively, for high and mid-low satellite's elevation angles.Peer Reviewe

GNSS-R derived centimetric sea topography: an airborne experiment demonstration

The results of two airborne experiments performed to test the precision and the relative accuracy of the conventional Global Navigation Satellite Systems Reflectometry (GNSS-R) technique employing only the C/A code are presented. The first and the second experiments demonstrate, respectively, a 17 cm precision for a 500 m flight altitude with a 8 km along-track spatial resolution, and a 6 cm precision for a 3000 m flight altitude with a 6.6 km along-track spatial resolution. In both, the Relative Mean Dynamic Topography (RMDT) is compared with results derived from traditional radar altimetry provided by Jason-2. The Root Mean Square (RMS) of the RMDTdifference between both measurement systems is 48 cm for the first flight, and 198 cm for the second flight. During the second flight, the feasibility of the proposed technique to measure the sea slopes is demonstrated by superposing over the aircraft ground track the measured sea surface height with the geoid undulations, which are about 1 meter.Peer ReviewedPostprint (published version

GNSS-R derived centimetric sea topography: an airborne experiment demonstration

The results of two airborne experiments performed to test the precision and the relative accuracy of the conventional Global Navigation Satellite Systems Reflectometry (GNSS-R) technique employing only the C/A code are presented. The first and the second experiments demonstrate, respectively, a 17 cm precision for a 500 m flight altitude with a 8 km along-track spatial resolution, and a 6 cm precision for a 3000 m flight altitude with a 6.6 km along-track spatial resolution. In both, the Relative Mean Dynamic Topography (RMDT) is compared with results derived from traditional radar altimetry provided by Jason-2. The Root Mean Square (RMS) of the RMDTdifference between both measurement systems is 48 cm for the first flight, and 198 cm for the second flight. During the second flight, the feasibility of the proposed technique to measure the sea slopes is demonstrated by superposing over the aircraft ground track the measured sea surface height with the geoid undulations, which are about 1 meter.Peer Reviewe

The proof of concept for 3-cm Altimetry using the Paris Interferometric Technique

© 2010 IEEE. Reprinted, with permission, from Nogués, O., Ribó, S., Arco, J. C., Cardellach, E., Rius, A., València, E., A. Camps, van der Marel, H., Martín-Neira, M., The proof of concept for 3-cm altimetry using the PARIS interferometric technique, Proceedings of IEEE International Geoscience and Remote Sensing Symposium (IEEE IGARSS), and july/2010. This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of CSIC products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to [email protected]. By choosing to view this document, you agree to all provisions of the copyright laws protecting it.Peer reviewe

Monitoring sea ice and dry snow with GNSS reflections

© 2010 IEEE. Reprinted, with permission, from Fabra , F., Cardellach, E., Nogués, O., Oliveras, S., Ribó, S., Rius, A., Belmonte, M., Semmling, M., Macelloni, G., Pettinato, S., Zasso, R., D Addio, S., Monitoring sea ice and dry snow with GNSS reflections, Proceedings of IEEE International Geoscience and Remote Sensing Symposium (IEEE IGARSS), and july/2010. This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of CSIC products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to [email protected]. By choosing to view this document, you agree to all provisions of the copyright laws protecting it.GPS reflected signals have become a source of opportunity for remote sensing of the Earth's suface. In this work, we present several capabilities of this technique in two different polar environments: Greenland and Antarctica. The first part is dedicated to the retrieval of sea-ice properties, giving emphasis to the study of the coherent phase for altimetric and roughness estimations, and polarimetric measurements for the determination of the ice salinity variation. The results show good agreement with a tide model and daily ice charts. On the second part, some preliminary results and analysis strategies to retrieve dry snow signatures are presented.Peer reviewe