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Coppo P.,SELEX Galileo | Cosi M.,SELEX Galileo | Engel W.,Jena Optronik GmbH | Nieke J.,European Space Agency | And 2 more authors.
Proceedings of SPIE - The International Society for Optical Engineering

The Sea & Land Surface Temperature Radiometer (SLSTR) is a high accuracy infrared radiometer selected as optical payload for the Sentinel 3 component of the GMES mission, to provide climatological data continuity respect to the previous ERS and ESA Envisat missions, that embarked respectively the ATSR, ATSR-2 and AATSR payloads. The instrument design follows the dual view concept of the ATSR series with some notable improvements. An increased swath width in both nadir and oblique views (1400 and 740 km) provides measurements at global coverage of Sea and Land Surface Temperature (SST/LST) with daily revisit times, which is useful for climate and meteorology (1 Km spatial resolution). Improved day-time cloud screening and other atmospheric products will be possible from the increased spatial resolution (0.5 Km) of the VIS and SWIR channels and additional SWIR channels at 1.375μm and 2.25μm. Two additional channels using dedicated detector and electronics elements are also included for high temperature events monitoring (1 km spatial resolution). The two Earth viewing swaths are generated using two telescopes and scan mirrors that are optically combined by means of a switching mirror at the entrance of a common Focal Plane Assembly. The eleven spectral channels (3 VIS, 3 SWIR, 2 MWIR, 3 TIR) are split within the FPA using a series of dichroics. The SWIR, MWIR and TIR optics/detectors are cooled down to 80 K with an active cryocooler, while the VIS detectors work at a stabilised uncooled temperature. The paper highlights the technical and programmatic status of the project, which is now in phase C. © 2010 Copyright SPIE - The International Society for Optical Engineering. Source

Di Nardo S.,University of LAquila | Farinelli P.,University of Perugia | Kim T.,TU Munich | Marcelli R.,CNR Institute for Microelectronics and Microsystems | And 5 more authors.
Advances in Radio Science

RF MEMS based switch matrices have several advantages compared to the mechanical or solid-state switch based ones for space applications. They are compact, light and less lossy with a high linearity up to high frequency. In this work, a 12×12 switch matrix with RF MEMS and LTCC technologies is presented based on the planar Bene?s network. The simulated performance of the 12×12 switch matrix is below -12 dB IL (Insertion Loss) up to C band and -15 dB RL (Return Loss) up to Ku band. Moreover, it has a good isolation better than -50 dB. A 4×4 switch matrix with the same design process and technologies is fabricated and measured to verify the 12×12 switch matrix design process. The measured performance agrees very well to the simulations. © Author(s) 2013. CC Attribution 3.0 License. Source

Audone B.,EMC | Marziali I.,ThalesAlenia Space
Proceedings of EMC Europe 2011 York - 10th International Symposium on Electromagnetic Compatibility

The present definition of Uniform Field Area (UFA) specified by EN 61000-4-3 does not provide constraints sufficient to guarantee reproducibility. It may be useful to establish a standard adequate for test repeatability when tests are performed in the same test site. On the other hand one is induced to believe that meeting the radiated test uncertainty calculated on the basis of the test equipment performance characteristics is sufficient to cover the needs of repeatability and reproducibility but this is not completely true because the electric field uniformity is not taken into account. This paper defines the Uniform Field (UF) factor; it is the right parameter to monitor and control the uniformity of the electric field in the test zone. This factor can be used to compare the results of tests of the Device under Test (DUT) performed in different test sites. © 2011 EMC Europe. Source

Gorlani M.,BLUE GROUP Engineering and Design | Cappadona A.,BLUE GROUP Engineering and Design | De Filippis Paolo,ThalesAlenia Space | Ernesto M.,ThalesAlenia Space
40th International Conference on Environmental Systems, ICES 2010

Nowadays, the increasing complexity and performances requested to products have lead modern engineering to develop and provide much more optimised components. In the context of design and analysis disciplines, one of the main barriers is the uncertainty of predictions that numerical modelling and simulation provide. Some techniques have been already standardised to cope with inaccuracies and relevant results uncertainties. In thermal problems they rely and involve the adoption of temperature margins, the implementation of sensitivity analyses and the execution of tests. In last years the application of the stochastic approach, as an advanced method for the adoption of novel techniques or just for improving the efficiency and productivity of the traditional ones, has been successfully introduced and proved its usefulness. The paper presents the results of the uncertainty/sensitivity analysis performed for the Thales Alenia Space thermal model of Expert re-entry vehicle demonstrator with Blue Engineering support using the stochastic approach based on the Monte Carlo Simulation method. Emphases are given to some goals reached thanks to the application of the stochastic method to the thermal analysis that are impossible to be obtained with the traditional approach. In particular the assessment of the confidence level related to the Expert Electronic Equipments and TPS performances and of the driving parameters.© 2010 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved. Source

Coppo P.,SELEX Galileo | Ricciarelli B.,SELEX Galileo | Brandani F.,SELEX Galileo | Delderfield J.,Rutherford Appleton Laboratory | And 13 more authors.
Journal of Modern Optics

SLSTR is a high accuracy infrared radiometer which will be embarked in the Earth low-orbit Sentinel 3 operational GMES mission. SLSTR is an improved version of the previous AATSR and ATSR-1/2 instruments which have flown respectively on Envisat and ERS-1/2 ESA missions. SLSTR will provide data continuity with respect to these previous missions but with a substantial improvement due to its higher swaths (750 km in dual view and 1400 km in single view) which should permit global coverage of SST and LST measurements (at 1 km of spatial resolution in IR channels) with daily revisit time, useful for climatological and meteorological applications. Two more SWIR channels and a higher spatial resolution in the VIS/SWIR channels (0.5 km) are also implemented for a better clouds/aerosols screening. Two further additional channels for global scale fire monitoring are present at the same time as the other nominal channels. © 2010 Taylor & Francis. Source

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