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Calvelli V.,National Institute of Nuclear Physics, Italy | Calvelli V.,University of Genoa | Musenich R.,National Institute of Nuclear Physics, Italy | Tunesi F.,Compagnia Generale per Lo Spazio | And 3 more authors.
IEEE Transactions on Applied Superconductivity | Year: 2017

Long-time exposure to galactic cosmic rays is one of the most problematic threats for a manned mission in the deep space. In the last decades, several studies of active superconducting magnetic shields were performed leading to the proposals of apparently promising magnetic configurations. However, as the interaction of energetic particles with the materials composing the magnets was not taken into account, the contribution of secondary particles to the astronauts' radiation dose was neglected, and, consequently, the actual effectiveness of the shields was overestimated. In the frame of the EU-FP7-SR2S project, a study of superconducting space radiation shield was performed associating the optimization of the magnetic configuration with Monte-Carlo simulation of the dose reduction. It was found that most of the magnetic shields proposed in previous works are not adequate, and a novel configuration, transparent to radiation, was proposed based on toroids arranged with their axes perpendicular to the spacecraft axis. Compared to other shields with the same shielding power, such a configuration results in lower magnetic field at the superconductor and very light design. © 2002-2011 IEEE.


Tipaldi M.,Compagnia Generale per Lo Spazio | Bruenjes B.,Universittsallee 27 29
2014 IEEE International Workshop on Metrology for Aerospace, MetroAeroSpace 2014 - Proceedings | Year: 2014

Spacecraft health monitoring and management systems (also referred to as FDIR (Fault Detection, Isolation and Recovery) systems)) are addressed since the very beginning of any space mission design and play a relevant role in the definition of their reliability, availability and safety objectives. Their primary purposes are the safety of spacecraft/mission life and the improvement of its service availability. In this paper current technical and programmatic FDIR strategies are presented along with their strong connection with the wider concept of on-board autonomy, which is becoming the key-point in the design of new-generation spacecrafts. Recent projects developed at OHB System AG have brought to light some issues in the current FDIR system design approaches. These findings pave the way for innovative solutions, which can support and not rule out conventional industrial practices. © 2014 IEEE.


Cecere N.,Intelligentia S.r.l. | Tipaldi M.,Compagnia Generale per Lo Spazio | Tipaldi M.,University of Sannio | Wenker R.,Universittsallee 27 29 | Villano U.,University of Sannio
3rd IEEE International Workshop on Metrology for Aerospace, MetroAeroSpace 2016 - Proceedings | Year: 2016

Software schedulability analysis is an important aspect for SW real-time verification. This paper proposes a concrete approach for analyzing the schedulability for the SW real-time application running on a spacecraft on-board computer. It is based on an extension of the response time analysis and takes into account many factors that could have a significant impact on the corresponding assessment. Measurements and analysis of schedulability have been carried out in a real space SW project and show the importance of focusing on this aspect in the first phases of the SW development. © 2016 IEEE.


Tipaldi M.,Compagnia Generale per Lo Spazio | Tipaldi M.,University of Sannio | Glielmo L.,University of Sannio
2nd IEEE International Workshop on Metrology for Aerospace, MetroAeroSpace 2015 - Proceedings | Year: 2015

On-board autonomy is becoming a crucial aspect of currently developed and future space projects, especially for deep space exploration missions. In the near future, spacecrafts will be able to receive, process and achieve high-level goals even in an uncertain or dynamically varying context. This paper presents a Markovian based approach in order to model on-board autonomy mechanisms. This approach fits the three layered autonomous space systems architecture and integrates a partially observable non-homogenous Markov model for the decisional layer with a Markov decision process for the operational layer. Autonomous spacecraft reconfigurability is particularly addressed. © 2015 IEEE.


Tipaldi M.,Compagnia Generale per Lo Spazio | Tipaldi M.,University of Sannio | Ferraguto M.,Space Systems Finland Ltd. | Moellmann C.,Universitaetsallee 27 29 | Bruenjes B.,Universitaetsallee 27 29
3rd IEEE International Workshop on Metrology for Aerospace, MetroAeroSpace 2016 - Proceedings | Year: 2016

The selection of an effective software development process is a crucial element in any space SW project. The waterfall software life cycle model as is can not provide an adequate solution to their relevant complexity and central role in the elicitation of spacecraft system-level requirements. Its main assumption of moving into a phase only when the preceding one is mature and complete is actually not attainable. In this paper, a tailoring of the waterfall model (named 'Robust Feedback Software Life-cycle Model') is presented. The proposed process sorts out these issues by combining a SW waterfall model with a SW incremental approach. It is currently used in satellite SW projects at OHB System AG. SW product metrics gathered from real SW space projects bear out its effectiveness and robustness against SW requirement evolution. © 2016 IEEE.


Fernandez I.,GTD Sistemas de Informacion SA | Di Cerbo A.,Intelligentia S.r.l. | Dehnhardt E.,Universitaetsallee 27 29 | Tipaldi M.,Compagnia Generale per Lo Spazio | Tipaldi M.,University of Sannio
3rd IEEE International Workshop on Metrology for Aerospace, MetroAeroSpace 2016 - Proceedings | Year: 2016

Functional and performance testing of critical space software is a very complex task since demanding quality requirements have to be fulfilled. In order to avoid any serious project delay and to preserve the product quality it is necessary to focus on test process definition, testing automation, testing tools, and standardization since the early phases of the project. This paper proposes a testing framework for critical space software named Technical Specification Validation Framework (TSVF). It can be used to verify the implementation of software functional and performance requirements by providing means to design test cases, to implement the corresponding test procedures, to execute a full software test campaign, and to analyze the corresponding test results automatically. Test case implementation can be carried out by means of an XML-based test procedure language independent from the underlying test environment and allowing a convenient definition of the different test steps from a test-based standpoint. © 2016 IEEE.


News Article | October 28, 2016
Site: co.newswire.com

Noordwijk, 26 January - Sapienza Consulting today announces it has been awarded a 3-year contract to supply the ECLIPSE suite and related services to Compagnia Generale per lo Spazio (CGS SpA), an OHB group company.


Paolozzi A.,University of Rome La Sapienza | Ciufolini I.,University of Salento | Flamini E.,Italian Space Agency ASI | Gabrielli A.,Italian Space Agency ASI | And 3 more authors.
Proceedings of the International Astronautical Congress, IAC | Year: 2012

LARES (LAser RElativity Satellite), a scientific satellite of the Italian Space Agency (ASI), has been accurately injectcd in the nominal orbit by the new ESA expendable launch vehicle, Vega during its qualification launch, on the 13,h of February 2012. This was a very exciting result also because of the low success rate of qualification launches . Furthermore, several innovative technical solutions characterize the new European launch vehicle, such as the extensive use of carbon fiber reinforced plastic composites for the rocket structures. LARES program started on February 2008 when the Italian Space Agency awarded a contract to the prime contractor CGS (former Carlo Gavazzi Space). A peculiarity of the LARES program was the extensive involvement of universities in many aspects such as the technical design of the satellite and the innovative separation system. A strong cooperation between ASI and ESA about its respective programs, since the acceptance of the LARES mission for the Vega maiden flight, allowed to design a mission which satisfies the scientific requirements of the satellite along with the launchcr qualification objectives. The trajectory itself was defined also taking into account the launch vehicle performance and trajectory constraints. The initial orbit envisaged for the maiden flight was a typical sun-synchronous orbit at about 750 km. However that was not acceptable for the science objectives, i.e., the measurement of the Lense- Thirring effect, an Einstein general relativity prediction. Therefore ESA and the launch vehicle authority, ELV (European Launch Vehicle) Prime Contractor of the VEGA development program, proposed a new orbit at 1200 km that later was changed to 1450 km along with small changes to the inclination in order to comply with all the safety constraints to the mission trajectory. In order to meet part of its qualification requirements, the VEGA upper-stage (AVUM) performed several maneuvers, especially during the ballistic phase, namely: the neutral axis maneuver, the barbeque, sun pointing, and spin axis maneuver. In this paper, an overview of the LARES mission and of its elements, including the payload ground segment, is given, together with the first results of the launch campaign and activities that brought the satellite in the final operative configuration. Copyright © (2012) by the International Astronautical Federation.


Notarnicola C.,Institute for Applied Remote Sensing | Ratti R.,Compagnia Generale per Lo Spazio | Maddalena V.,Compagnia Generale per Lo Spazio | Schellenberger T.,Institute for Applied Remote Sensing | And 2 more authors.
IEEE Geoscience and Remote Sensing Letters | Year: 2013

A time series of COSMO-SkyMed (CSK) images is exploited for detection of seasonal snow cover in alpine areas. For the first time, a complete time series of CSK images acquired during snow fall and melt periods in winter 2010-2011 is addressed to verify the snow cover mapping capabilities of X-band radar images under different conditions (from dry to wet snow). The algorithm for snow detection is based on a multitemporal approach with the concept that free water in the snowpack attenuates the X-band synthetic aperture radar signal and wet snow can be classified by comparing images acquired under wet snow and snow-free conditions. Thresholds to make this distinction are compared across all the images to check sensitivity to different winter conditions and land-use classes. The impact of variable and fixed thresholds on the retrieved snow-covered areas is assessed. Snow maps from CSK images compared with Landsat Enhanced Thematic Mapper Plus snow maps indicate a constant underestimation in the detection of snow extent, particularly during winter season, thus showing a scarce sensitivity of X-band signals to snow in dry conditions. Probability of error maps are also calculated for each CSK snow map, thus providing information on the classification error associated to each pixel labeled as snow. The analysis of the snow line variation during spring determines good time consistency in the determination of snow maps from CSK images. © 2012 IEEE.


Di Nicolantonio W.,Compagnia Generale per Lo Spazio | Cazzaniga I.,National Research Council Italy | Cacciari A.,Compagnia Generale per Lo Spazio | Bresciani M.,National Research Council Italy | Giardino C.,National Research Council Italy
Journal of Applied Remote Sensing | Year: 2015

The capabilities of different Earth Observation multispectral satellites are employed for detecting and tracking of desert dust coming from North Africa toward the Northern Italy area and for evaluating the impact of Saharan dust deposition in inland waters, such as those of Lake Garda. Absorbing and scattering spectral optical properties of desert aerosol in the atmospheric windows in the ultraviolet, visible-near-infrared, and infrared spectral ranges are exploited in the dust retrieval performed by OMI/Aura, MODIS/Terra-Aqua, and SEVIRI/MSG satellite sensors. Therefore, the direct link between dust deposition and increase in phytoplankton abundance has been assessed retrieving MERIS-based chlorophyll-a (chl-a) concentration for the desert dust events. Estimates of the increased chl-a in the lake have been derived with values in concentration from 30% to 170%. AERONET sun-photometer measurements, gravimetric particulate matter samplings, in situ chl-a concentration and surface temperature are employed to select events and assess the presence of desert dust and recognize a corresponding increase of the phytoplankton abundance in the analyzed inland waters. The improved observational features that will be provided by the next European Sentinels missions, namely Sentinel-2, 3, 4, 5P, together with MTG-I (Imager) and MTG-S (Sounder) will allow better monitoring atmospheric constituents and studying the environmental impacts of desert dust transport. © 2015 Society of Photo-Optical Instrumentation Engineers (SPIE).

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