PhD theses proposals

Número de entradas: 2

New techniques to sense heavy precipitation: polarimetric radio-occultations with navigation signals (GNSS) aboard the PAZ satellite

Estado: proposal (27/02/2018)
Supervisada por: Estel Cardellach Galí

ROHP-PAZ is a mission of opportunity: The Spanish Earth Observation PAZ satellite, ready for launch, was initially designed to carry a Synthetic Radar Aperture (SAR) as primary and sole payload. It included an advanced Global Navigation Satellite System (GNSS) receiver for precise orbit determination. The design of this particular GNSS receiver allows the tracking of 'occulting' signals, that is, signals transmitted by navigation satellites setting below the horizon of the Earth (or rising above it). The Spanish Ministry for Science and Innovation (MICINN) approved a proposal aimed to modify the original plans of PAZ, by including a polarimetric GNSS Radio-Occultation (RO) payload, the ROHP-PAZ experiment.

ROHP-PAZ is a proof-of-concept experiment: for the first time ever, GNSS RO measurements will be taken at two polarizations, to exploit the potential capabilities of polarimetric radio occultation for detecting and quantifying heavy precipitation events and other de-polarizing atmospheric effects (e.g. cloud ice). If the concept is proved, PAZ will mean a new application of the GNSS Radio-Occultation observations, by providing coincident thermodynamic and precipitation information with high vertical resolution within regions with thick clouds.

PAZ will be launched in January 2018, and short afterwards the ROHP-PAZ experiment will start producing raw data. The proposed PhD study would focus on the low level processing and analysis of these new data sets, contribute developing the early GNSS polarimetric RO products and assessing its impact on atmospheric sciences.

Interested candidates, please contact estel @ as soon as possible

Remote sensing of ocean surface currents using TV signals broadcast from geostationary orbit

Estado: proposal (27/02/2018)
Supervisada por: Serni Ribó

The Earth is illuminated in the microwave frequency range by hundreds of communication and broadcasting satellites from geostationary orbit. Their potential for remote sensing of the Earth is enormous, as the collective power and frequency range of the transmitted signals surpasses that of earth-observation satellites, and their broad frequency range makes them suitable for atmosphere, land, ocean and cryosphere applications.

Although primarily not intended for remote sensing, communication satellites may play a key role in the next generation of space-borne remote sensing missions. Compared to classical radar and radiometer systems, the use of the so-called signals of opportunity has significant advantages when measurements shall be densified in space and time in order to enable the observation of short-time and small-scale geophysical phenomena at global scale. A single only-receiving instrument may simultaneously gather many signals scattered by the Earth's surface, which were transmitted by different sources. In this way the Earth can be covered by better spatial sampling and in less time, compared to standard space-borne radar systems.

Understanding short-time and small-scale ocean surface currents is of paramount importance to better understand global ocean dynamics. For that reason the proposed PhD study will focus on how the speed and direction of sea-surface currents can be measured directly through the Doppler signatures of the broadcast TV signals reflected on the sea surface.

The work will comprise the study of the instrumental concept, mission coverage, instrument prototype development, field testing, and data analysis.

Interested candidates, please contact ribo @ as soon as possible.
Institute of Space Sciences (IEEC-CSIC)

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An institute of the Consejo Superior de Investigaciones Científicas

An institute of the Consejo Superior de Investigaciones Científicas
Affiliated with the Institut d'Estudis Espacials de Catalunya

Affiliated with the Institut d'Estudis Espacials de Catalunya