Ciancetta E.,Thales Alenia |
Cimino M.,Thales Alenia |
Cuzzocrea G.,Thales Alenia |
Gervasio G.,Thales Alenia |
And 3 more authors.
E3S Web of Conferences | Year: 2017
European Space Agency in the frame of Cosmic Vision 2015-2025 program . It is a cosmology mission whose prime objective is to study the geometry and the nature of the dark matter and the dark energy with unprecedented accuracy. The spacecraft will be launched in 2020 by a Soyuz launcher, to perform a six-year survey of the extragalactic sky from a large-amplitude orbit around Lagrange point L2 of the Sun-Earth system. This paper outlines the Euclid Electrical Power Subsystem (EPS) design, providing a description of the major design drivers and resulting configuration, with a view to highlight aspects that could be considered for future designs. © The Authors, published by EDP Sciences, 2017.
Flechtner F.,German Research Center for Geosciences |
Neumayer K.-H.,German Research Center for Geosciences |
Dahle C.,German Research Center for Geosciences |
Dobslaw H.,German Research Center for Geosciences |
And 3 more authors.
Surveys in Geophysics | Year: 2015
The primary objective of the gravity recovery and climate experiment follow-on (GRACE-FO) satellite mission, due for launch in August 2017, is to continue the GRACE time series of global monthly gravity field models. For this, evolved versions of the GRACE microwave instrument, GPS receiver, and accelerometer will be used. A secondary objective is to demonstrate the effectiveness of a laser ranging interferometer (LRI) in improving the satellite-to-satellite tracking measurement performance. In order to investigate the expected enhancement for Earth science applications, we have performed a full-scale simulation over the nominal mission lifetime of 5 years using a realistic orbit scenario and error assumptions both for instrument and background model errors. Unfiltered differences between the synthetic input and the finally recovered time-variable monthly gravity models show notable improvements with the LRI, on a global scale, of the order of 23 %. The gain is realized for wavelengths smaller than 240 km in case of Gaussian filtering but decreases to just a few percent when anisotropic filtering is applied. This is also confirmed for some typical regional Earth science applications which show randomly distributed patterns of small improvements but also degradations when using DDK4-filtered LRI-based models. Analysis of applied error models indicates that accelerometer noise followed by ocean tide and non-tidal mass variation errors are the main contributors to the overall GRACE-FO gravity model error. Improvements in these fields are therefore necessary, besides optimized constellations, to make use of the increased LRI accuracy and to significantly improve gravity field models from next-generation gravity missions. © 2015 Springer Science+Business Media Dordrecht
Agency: European Commission | Branch: FP7 | Program: CP | Phase: ICT-2011.2.1 | Award Amount: 8.09M | Year: 2011
The ARCAS project proposes the development and experimental validation of the first cooperative free-flying robot system for assembly and structure construction. The project will pave the way for a large number of applications including the building of platforms for evacuation of people or landing aircrafts, the inspection and maintenance of facilities and the construction of structures in inaccessible sites and in the space.\nThe detailed scientific and technological objectives are:\n1)New methods for motion control of a free-flying robot with mounted manipulator in contact with a grasped object as well as for coordinated control of multiple cooperating flying robots with manipulators in contact with the same object (e.g. for precise placement or joint manipulation)\n2)New flying robot perception methods to model, identify and recognize the scenario and to be used for the guidance in the assembly operation, including fast generation of 3D models, aerial 3D SLAM, 3D tracking and cooperative perception\n3)New methods for the cooperative assembly planning and structure construction by means of multiple flying robots with application to inspection and maintenance activities\n4)Strategies for operator assistance, including visual and force feedback, in manipulation tasks involving multiple cooperating flying robots\nThe above methods and technologies will be integrated in the ARCAS cooperative flying robot system that will be validated in the following scenarios: a) Indoor testbed with quadrotors, b) Outdoor scenario with helicopters, c) free-flying simulation using multiple robot arms.\nThe project will be implemented by a high-quality consortium whose partners have already demonstrated the cooperative transportation by aerial robots as well as high performance cooperative ground manipulation. The team has the ability to produce for the first time challenging technological demonstrations with a high potential for generation of industrial products upon project completion.
Agency: European Commission | Branch: H2020 | Program: RIA | Phase: COMPET-01-2014 | Award Amount: 2.73M | Year: 2015
Unrestricted access to Space low shock non-explosive actuators has been identified as an urgent action by the European Commission, the European Space Agency and the European Defence Agency. Project REACT proposal is oriented to permit the unrestricted access of Europe to the technology of high reliable non-explosive actuators based on SMA (Shape Memory Alloy) technology. The REACT (REsettable Hold-Down and Release ACTuator) device is a new Hold Down and Release Actuator (HDRA) for space applications that have been developed as an improved alternative to currently available devices. Specifically, the proposed project is focused on develop low shock resettable Hold Down and Release actuators and qualify them integrated in real space final user space applications that require this release devices, such as big structures deployment, space science payload subsystems deployment, launchers subsystems deployment and small satellites subsystems deployment. The TRL (Technology Readiness Level) expected to be obtained once the project concluded shall be 8. REACT project is aimed to optimize and evolve standard REACT devices designs recently qualified up to TRL6 in order to match the requirements of specific applications demanded by the space market and generate a competitive range of products. The product optimized for space market applications will be able to replace and improve the performance of currently available US components in different areas of application (launchers, science, telecom and Earth Observation applications). REACT project contemplates to develop new SMA material manufacturing techniques and new SMA alloys that fit the specific requirements of the final users also involved in the project. In addition, research and improve the actuator tribology will be a technical objective to be addressed during the project development. Finally it is addressed a complete qualification campaign in order to upgrade to TRL8 the REACT models.
Ward R.L.,Australian National University |
Fleddermann R.,Australian National University |
Francis S.,Australian National University |
Mow-Lowry C.,Australian National University |
And 22 more authors.
Classical and Quantum Gravity | Year: 2014
The Gravity Recovery and Climate Experiment (GRACE) mission, launched in 2002, is nearing an end, and a continuation mission (GRACE Follow-on) is on a fast-tracked development. GRACE Follow-on will include a laser ranging interferometer technology demonstrator, which will perform the first laser interferometric ranging measurement between separate spacecraft. This necessitates the development of lightweight precision optics that can operate in this demanding environment. In particular, this beam routing system, called the triple mirror assembly, for the GRACE Follow-on mission presents a significant manufacturing challenge. Here we report on the design and construction of a prototype triple mirror assembly for the GRACE Follow-on mission. Our constructed prototype has a co-alignment error between the incoming and outgoing beams of 9 μrad, which meets the requirement that this error must be less than 10 μrad. © 2014 IOP Publishing Ltd.
Arnold D.,University of Bern |
Lutz S.,University of Bern |
Dach R.,University of Bern |
Jaggi A.,University of Bern |
Steinborn J.,SpaceTech GmbH
International Association of Geodesy Symposia | Year: 2016
Real-time and near real-time coordinate estimation become increasingly important in many applications like, e.g., environmental hazard monitoring. The typical approach is based on a Precise Point Positioning (PPP), which has the advantage that all stations can be processed independently and, therefore, the processing of monitoring networks with a large number of stations becomes efficient due to parallelization. However, a PPP requires external satellite clock corrections and the accuracy of the obtained coordinates strongly depends on the consistent usage of these clock corrections and on their quality. Since the processing time for real-time products is strictly limited, it is clear that, in general, the quality of such clock corrections is degraded w.r.t. post-processed products. The purpose of this article is to demonstrate that the classical double-difference network approach, where no accurate satellite clock corrections are needed, has a lot of potential also for near real-time applications, when a latency of a few minutes is acceptable. The presented results were obtained in the framework of the establishment of a National Multi-Hazard Early Warning System in the Sultanate of Oman. © Springer International Publishing Switzerland 2015.
Guilbert-Lepoutre A.,European Space Agency |
Guilbert-Lepoutre A.,University of Franche Comte |
Besse S.,European Space Agency |
Mousis O.,Aix - Marseille University |
And 6 more authors.
Space Science Reviews | Year: 2015
Studying comets is believed to bring invaluable clues on the formation and evolution of our planetary system. In comparison to planets, they have undergone much less alteration, and should have therefore retained a relatively pristine record of the conditions prevailing during the early phases of the solar system. However, comets might not be entirely pristine. As of today, we have not been able to determine which of the observed physical, chemical and orbital characteristics of comets, after they have evolved for more than 4 Gyr in a time-varying radiative and collisional environment, will provide the best clues to their origin. Comet physical characteristics as inherited from their formation stage may be very diverse, both in terms of composition and internal structure. The subsequent evolution of comet nuclei involves some possible processing from radiogenic heating, space weathering and large- and small-scale collisions, which might have modified their primordial structures and compositions with various degrees. When comets enter the inner solar system and become active, they start to lose mass at a very high rate. The effects of activity on comet nuclei involve a layering of the composition, a substantial non-even erosion and modification of their size and shape, and may eventually result in the death of comets. In this review, we present the dominating processes that might affect comet physical and chemical properties at different stages of their evolution. Although the evolutionary track may be specific to each comet, we can focus on long-lasting modifications which might be common to all nuclei after their formation stage, during their storage in reservoirs in the outer solar system, and once comets enter the inner solar system and become active objects. © 2015, Springer Science+Business Media Dordrecht.
Fitzau O.,Fraunhofer Institute for Laser Technology |
Herper M.,Fraunhofer Institute for Laser Technology |
Giesberts M.,Fraunhofer Institute for Laser Technology |
Nicklaus K.,SpaceTech GmbH |
And 5 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2015
In scope of the ESA funded "High stability Laser" activity, a single-mode and single-frequency fiber power amplifier with 500 mW output power at 1064 nm wavelength has been developed. It is part of an elegant breadboard (EBB) which consists additionally of an ultra-stable Fabry-Perot reference for frequency stabilization. The monolithic fiber amplifier is seeded by a non-planar ring oscillator (NPRO) with a linewidth below 10 kHz. The amplifier is stabilized in power via pump diode modulation and achieves a RIN performance of < 0.01/sqrt(Hz) in the range from 10-3 Hz to 10 Hz and a polarization extinction ratio of >30 dB. © 2015 SPIE.
Karpov A.,The Aerospace Corporation |
Munder J.,SpaceTech GmbH |
Franck T.,SpaceTech GmbH |
Teselkin S.,The Aerospace Corporation
62nd International Astronautical Congress 2011, IAC 2011 | Year: 2011
AirLaunch, based on Antonow 124 aircraft, targets a satellite launch capability of 4t (low inclination) to 3t (high inclination) in LEO and 1.5t in GTO. Also direct GEO insertion and transfer orbits will be offered. The system will start from a launching airport at the equator in Biak, Indonesia, where virtually no constraints on orbit inclinations exist. A rocket of about 100t mass will have to be ejected from the aircraft and then ignited in a safe distance from the aircraft. The rocket design is fully based on liquid fuel technology using an adapted Soyuz 2nd stage as the first AirLaunch stage and a new 2nd stage, but based on existing Russian components. A novel method for ejection derived from submarine technology will be used together with an Antonow 124 flight trajectory resulting in low gravity (about 0.3g) during the ejection. A Payload Pre Integration Centre (EPPIC) in Europe, Munich is under investigation, with the aim to maximize preparation activities before transfer to Biak and to minimize activities at the launching airport. A demonstrator program is established to prove this technology gradually increasing the mass towards the target mass of 100t. The demonstrator tests are now planned to start mid 2012. An overview of the system will be given and an outline of the next steps including the technology demonstrator programme. The characteristics of the system and user interfaces will be described. AirLaunch plans to enter into service in 2015/2016. Copyright ©2011 by AirLaunch Aerospace Corporation published by the IAF with permission and released to IAF to publish in all forms.
Wachter J.,Helmholtz Center Potsdam |
Babeyko A.,Helmholtz Center Potsdam |
Fleischer J.,SpaceTech GmbH |
Haner R.,Helmholtz Center Potsdam |
And 3 more authors.
Natural Hazards and Earth System Science | Year: 2012
Fostered by and embedded in the general development of information and communications technology (ICT), the evolution of tsunami warning systems (TWS) shows a significant development from seismic-centred to multi-sensor system architectures using additional sensors (e.g. tide gauges and buoys) for the detection of tsunami waves in the ocean. Currently, the beginning implementation of regional tsunami warning infrastructures indicates a new phase in the development of TWS. A new generation of TWS should not only be able to realise multi-sensor monitoring for tsunami detection. Moreover, these systems have to be capable to form a collaborative communication infrastructure of distributed tsunami warning systems in order to implement regional, ocean-wide monitoring and warning strategies.
In the context of the development of the German Indonesian Tsunami Early Warning System (GITEWS) and in the EU-funded FP6 project Distant Early Warning System (DEWS), a service platform for both sensor integration and warning dissemination has been newly developed and demonstrated. In particular, standards of the Open Geospatial Consortium (OGC) and the Organization for the Advancement of Structured Information Standards (OASIS) have been successfully incorporated. In the FP7 project Collaborative, Complex and Critical Decision-Support in Evolving Crises (TRIDEC), new developments in ICT (e.g. complex event processing (CEP) and event-driven architecture (EDA)) are used to extend the existing platform to realise a component-based technology framework for building distributed tsunami warning systems. © 2012 Author(s). CC Attribution 3.0 License.