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Pasian M.,University of Pavia | Cametti M.,University of Pavia | Bozzi M.,University of Pavia | Perregrini L.,University of Pavia | Rawson S.,Callisto
International Journal of Microwave and Wireless Technologies | Year: 2011

Multi-satellite missions, such as the next generation of METEOSAT geostationary satellites, require a ground station able to support an arbitrary number of satellites that can fly wherever within a pre-determined sky region, called control box. The use of high frequencies, around 26 GHz, imposes on the ground station high antenna gains to compensate for the noise temperature collected at those frequencies to obtain the specified G/T. Regardless of the narrow beamwidths that emerged from the adoption of high antenna gains, it is also required to operate with fixed (i.e. without any kind of tracking) antennas. This paper shows how all these specifications drive a new type of ground station with respect to current solutions. The proposed architecture is based on a multi-reflector system able to provide a set of interleaved beams, which generates an almost uniform coverage of the control box. The architecture is analyzed and designed, optimizing all the main antenna parameters, and presenting the analytical results. © Copyright Cambridge University Press and the European Microwave Association 2011. Source


Pasian M.,University of Pavia | Cametti M.,University of Pavia | Bozzi M.,University of Pavia | Perregrini L.,University of Pavia | Rawson S.,Callisto
European Microwave Week 2010, EuMW2010: Connecting the World, Conference Proceedings - European Microwave Conference, EuMC 2010 | Year: 2010

This paper presents the preliminary studies and results for ground stations to be used to control multi-satellite missions, such as the next generation of METEOSAT satellites, without any kind of mechanical or electric beam steering. The most important draft specifications driving the design of these ground stations will be discussed in detail, highlighting those which are contributing to envision a different system with respect to standard ground stations. The most promising antenna architectures are described and the preliminary results from antenna analyses are reported. © 2010 EuMA. Source


Martellosio A.,University of Pavia | Pasian M.,University of Pavia | Rayet R.,Callisto | Rawson S.,Callisto | Bonhoure T.,Callisto
2016 10th European Conference on Antennas and Propagation, EuCAP 2016 | Year: 2016

Receivers for radio-astronomical applications, in particular for very long baseline interferometry techniques, where a metal feed is often used to illuminate a reflector antenna, usually operates over wide bandwidths and cooled to low temperatures. In particular, the possibility of cooling not only the low noise amplifier, but also the entire feed is attractive to lower the equivalent noise temperature. However, this is usually achieved placing the feed within a Dewar, thus imposing an impact on the radiation properties of the feed itself. In addition, the feed performance can be further affected by the presence of a noise injection probe antenna, often required for calibration purposes. This paper presents the electromagnetic study of a cryogenic receiver, composed by a Quad Ridge Feed Horn (QRFH), a wideband noise injection antenna probe, and a cryogenic Dewar. The receiver works from 2 GHz to 14 GHz, intended for VLBI applications. The simulated and measured results show that a minor impact on the QRFH radiation patterns is expected from the Dewar and the probe antenna, while achieving the required coupling factor between the QRFH ports and the probe antenna. © 2016 European Association of Antennas and Propagation. Source


Bozzi M.,University of Pavia | Cametti M.,University of Pavia | Fornaroli M.,Callisto | Maguire P.,Zelinda Ltd | And 4 more authors.
IEEE Antennas and Propagation Magazine | Year: 2012

Space communications between distant spacecraft and the Earth are mainly based on large reflector antennas, such as the 35-m Deep-Space Antennas of the European Space Agency. These provide the required G T and EIRP to existing missions, such as, for example, Rosetta, Mars Express, and Venus Express. However, future missions to Mars and to outer planets (Jupiter and Saturn) are going to require higher performance for the ground segment that current stations cannot offer. This paper presents the results carried out in the framework of a strategic feasibility study promoted by the European Space Agency to identify the best architecture for future deep-space ground stations. Technical, economic, and operating aspects are described, deriving high-level specifications for future ground stations, and discussing in detail the antenna options and the subsystem devices. As an outcome, two different ground-station architectures, based on arrays of reflector antennas, are proposed and discussed in detail. These indicate the roadmaps that are going to pave the road to the final implementation. © 2011 IEEE. Source


Rawson S.,Callisto | Fornaroli M.,Callisto | Bozzi M.,University of Pavia | Cametti M.,University of Pavia | And 4 more authors.
Proceedings of the 5th European Conference on Antennas and Propagation, EUCAP 2011 | Year: 2011

This paper presents the results of an architectural study into future ESA Deep-Space ground stations. The objective of the project is to investigate solutions for building ground stations for future Deep Space missions for exploration of the outer reaches of the solar system. The study addresses not only the engineering challenges associated with various technical options, but also the cost, with a clear goal of identifying the most cost effective approach. © 2011 EurAAP. Source

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