Denis G.,Astrium Satellites |
Pasco X.,Fondation pour la Recherche Strategique
Proceedings of the International Astronautical Congress, IAC | Year: 2013
This paper reviews the challenges and opportunities of market growth for space applications. Up to now, the development of space systems has been mainly driven by global or regional needs or sovereignty missions. The global dimension of satellites fits perfectly the needs of customers requiring a global coverage. Meteorology, operational oceanography, TV broadcast or Global Navigation Systems are good examples. In those domains, either the needs are wide enough or the communities of users are well structured. Main customers were able until now to invest in a proprietary capacity or to fund a significant part of the infrastructure. New elements shape today's landscape: - The budgetary constraints affecting many countries weaken this model. - The increasing competition and the emergence of new players. - New operational needs are more and more challenging (e.g. real time surveillance of wide areas) and require-dedicated capacities, while the users demand is fragmented and spread over the world. Meeting the performance requirements can justify a collective approach with capacity sharing. So far collective solutions have been hampered by the reluctance of the governments to share exclusive and sovereign responsibilities. The market of space applications is thus facing a general challenge regarding future growth: cost-effective solutions can be developed and operated only if the user base is consolidated. Beyond technical issues, this paper summarises the findings of recent studies on the business cases and governance of space systems. Assessing examples in Europe and worldwide, the paper analyses the success factors, relying on a smart combination between: - institutional and commercial assets, - dedicated systems and general purpose systems, - national versus European or international capacities, - with a clear governance and mandate for the coordinating entities. Addressing fragmented markets will likely be the main growth opportunity in the coming years, while usual domains are becoming renewal markets. There is an opportunity for the services activity. Nevertheless, the main focus of this analysis is the space infrastructure and more specifically the satellites for Earth observation, telecommunications and navigation applications. The service dimension is addressed through its potential impact on the long term sustainability of space systems. International cooperation plays definitely a major role. The successful implementation of large capacities will depend on the cooperation between two, three or more stakeholders and will be a lengthy process. In conclusion, the paper emphasises the importance of raising awareness and promoting best practices. ©2013 by the International Astronautical Federation. All rights reserved.
Petit A.,French Institute for Research in Computer Science and Automation |
Marchand E.,University of Rennes 1 |
Kanani K.,Astrium Satellites
IEEE International Conference on Intelligent Robots and Systems | Year: 2011
For a space rendezvous mission, autonomy imposes stringent performance requirements regarding navigation. For the final phase, a vision-based navigation can be a solution. A 3D model-based tracking algorithm has been studied and tested on a mock-up of a telecommunication satellite, using a 6-DOF robotic arm, with satisfactory results, in terms of precision of the pose estimation and computational costs. Quantitative tests in open loop have been carried out to show the robustness of the algorithm to relative inter frame motions chaser/target, orientation variations and illumination conditions. The tracking algorithm has also been successfully implemented in a closed loop chain for visual servoing. © 2011 IEEE.
Widder J.,Vienna University of Technology |
Biely M.,Ecole Polytechnique Federale de Lausanne |
Gridling G.,Vienna University of Technology |
Weiss B.,Vienna University of Technology |
Blanquart J.-P.,Astrium Satellites
Distributed Computing | Year: 2012
We consider the problem of reaching agreement in distributed systems in which some processes may deviate from their prescribed behavior before they eventually crash. We call this failure model "mortal Byzantine". After discussing some application examples where this model is justified, we provide matching upper and lower bounds on the number of faulty processes, and on the required number of rounds in synchronous systems. We then continue our study by varying different system parameters. On the one hand, we consider the failure model under weaker timing assumptions, namely for partially synchronous systems and asynchronous systems with unreliable failure detectors. On the other hand, we vary the failure model in that we limit the occurrences of faulty steps that actually lead to a crash in synchronous systems. © The Author(s) 2011.
Genin L.,Astrium Satellites |
Genin L.,ONERA |
Champagnat F.,ONERA |
Le Besnerais G.,ONERA
Applied Optics | Year: 2012
This paper deals with point target detection in nonstationary backgrounds such as cloud scenes in aerial or satellite imaging. We propose an original spatial detection method based on first- and second-order modeling (i.e., mean and covariance) of local background statistics.We first show that state-of-the-art nonlocal denoising methods can be adapted with minimal effort to yield edge-preserving background mean estimates. These mean estimates lead to very efficient background suppression (BS) detection. However, we propose that BS be followed by a matched filter based on an estimate of the local spatial covariance matrix. The identification of these matrices derives from a robust classification of pixels in classes with homogeneous second-order statistics based on a Gaussian mixture model. The efficiency of the proposed approaches is demonstrated by evaluation on two cloudy sky background databases. © 2012 Optical Society of America.
Picard M.,Astrium Satellites |
Oularbi M.R.,Telecom Bretagne |
Flandin G.,Astrium Satellites |
Houcke S.,Telecom Bretagne
2012 6th Advanced Satellite Multimedia Systems Conference, ASMS 2012 and 12th Signal Processing for Space Communications Workshop, SPSC 2012 | Year: 2012
In the field of maritime surveillance, the space-based detection of Automatic Identification System (AIS) communications enables ship tracking and fleet monitoring with a global coverage. SAT-AIS is a joint initiative from the European Space Agency (ESA) and the European Maritime Safety Agency (EMSA) to define a sustainable space-based system that will provide AIS data to institutional organisations and other entities. The AIS communication system was not originally designed for a capture from space. As a consequence, a space-based AIS receiver faces severe technical issues, in particular a drastic amount of co-channel interferences. Astrium is working under ESA contract on an affordable SAT-AIS solution with a strong emphasis on a high-performance AIS payload and processing chain. We propose a multi-antenna AIS receiver coupled with an adaptive multi-user processing solution suited to maximize the detection of AIS messages. The proposed algorithm implements a number of diversity techniques to take advantage of the variability of received signal characteristics, especially the Direction of Arrival (DOA), incident polarization, Doppler spread, signal strength and path delay. © 2012 IEEE.
Soula L.,Astrium Satellites
European Space Agency, (Special Publication) ESA SP | Year: 2012
The Gaia objective is to produce a very accurate catalogue of 1 billion of sky objects in our galaxy and beyond. ASTRIUM's extensive experience on silicon carbide (SiC) instruments has helped developing the latest-generation payload module. It integrates the most sensitive and stable telescopes ever made, mounted on a SiC torus structure supported by three bipods. This payload module has been tested in June 2011 by ASTRIUM at INTESPACE facilities in Toulouse. To conduct the sine qualification tests and support the data analyses in real-time, advanced tools have been used. Most of them have been developed in a previous ESA R&D project  "DYNamics: AssessMent and Improvement of TEst Data (DYNAMITED)" and implemented in a DynaWorks® environment. Mass Operator calculation, to evaluate the payload module interface loads from measured accelerations, or automatic correlation through a criterion based on FRF from tests or predictions, are part of these tools. Testing such a structure also revealed some piloting difficulties due to a quite low and varying damping of the structure and a strong coupling with the shaker. To take into account such phenomena in the correlation work, enhanced simulations have also been performed considering multi-points phased excitations. These analyses demonstrate the payload module qualification status and allow derivate a more representative model to be used in further coupled system activities.
Pitz W.,Astrium Satellites |
Miller D.,Astrium Satellites
IEEE Transactions on Geoscience and Remote Sensing | Year: 2010
TerraSAR-X is a versatile synthetic aperture radar (SAR) satellite with active phased array antenna technology and represents the backbone of the German national radar Earth observation mission. With its large variety of different SAR imaging modes and its high operational flexibility, TerraSAR-X ideally serves the scientific community and users from the industrial sector and governmental institutions. The innovative satellite system design combines the rich experience from past German and European SAR space missions like X-SAR, SRTM, ERS 1 and 2, and Envisat combined with state-of-the-art Earth observation bus technology as used, e.g., on the CHAMP and GRACE satellites. © 2009 IEEE.
Zanon O.,Astrium Satellites
Simulation Series | Year: 2011
Astrium Satellites has developed a simulation infrastructure called SimTG. A modeling language was to be chosen to ease the development of simulation models running on SimTG. Thus a domain specific language dedicated to space simulation has been defined. The article will present its main features and the workbench support that has been developed around it.
Green C.R.,Astrium Satellites |
Seymour C.D.,Astrium Satellites
IEEE MTT-S International Microwave Symposium Digest | Year: 2013
Astrium and SEDI have designed, manufactured and qualified a range of high power, high efficiency GaN transistor devices in S and L bands. Formal qualification testing of the SEDI GaN HEMT process was completed in July 2011 and additional testing was completed in October 2011 to gain full JAXA qualification. At equipment level, Astrium has completed the Engineering Qualification Model (EQM) development of an S Band GaN SSPA, including Electronic Power Conditioner (EPC), for near term flight deployment on a major navigation satellite programme. The paper describes the range of GaN devices developed together with a summary of the qualification activities and a presentation of performance achievements. © 2013 IEEE.
Scouarnec D.,Astrium Satellites France |
Stirland S.,Astrium Satellites |
Proceedings of the 2013 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications, IEEE APWC 2013 | Year: 2013
Starting from Current state of the art of antenna products flown on Telecommunication satellites - UHF to KA band-, the review of the future mission needs is translated into requirements for antenna product evolutions. Passive and active antenna solutions are discussed, the latter offering increased coverage and power flexibility expressed by commercial operators. Main trends are presented, discussing the current limitations of technology and the required developments enabling the related products to be flown on commercial applications Accommodation and validation of those new products at satellite level are illustrated in the last section of the paper. © 2013 IEEE.