pléiades satellite agility

The compression module and the SSR are physically in one equipment referred to as COME (COmpresseur MEmoire). Three days after the launch, the Pleiades satellite MTF was computed thanks to images of stars in the Pleiades constellation, as a sign of destiny. The use of both satellites simultaneously in orbit shifted by 180° permits to ensure: - the daily accessibility to any point of the Earth and a prompt imaging required by Defense and Civil Security missions. A very important operational criteria is the devivery of the data products for the commercial customers in record time. RF communications: An X-band downlink provides a nominal payload transmission rate of 465 Mbit/s in 3 channels, each of 155 Mbit/s capacity. For example, detectors non-uniformity can be measured in front of a integrating sphere during on-ground tests, and the camera best focus can be determined using a collimator on an optical facility, but both of these parameters are expected to vary slightly in orbit and therefore must be updated after launch. Each star tracker operates autonomously, its pointing accuracy is better than 2 arcsec in FOV error, and 10 arcsec (max) in noise which translates to 200 m on the ground. The first generation will only be furnished with an optical high-resolution imager. With a roll ”pointing” capability of 30º with respect to the track, world access can be achieved in 5 days with one satellite, and in 4 days with the system's 2 satellites. This has been the most expensive salvage operation in marine history. Since the beginning of 2013, Pleiades is fully operational in the International Charter “space and major disasters” process . This position offers an optimum between mechanism and accuracy. The Pléiades-HR 1A was launched on December 17, 2011, from the Guiana Space Centre, Kourou, French Guiana, and was joined by Pléiades-HR 1B on December 2, 2012. In the same timeframe, the Italian Space Agency (ASI) performed also studies of a new program under the name of COSMO-SkyMed. SSOT has a mass of 117 kg. This new model should then be available to the international community through the CNES participation to the GSICS (Global Space-based Inter-Calibration System). [1] Designed as a dual civil/military system, Pléiades will meet the space imagery requirements of European defence as well as civil and commercial needs. 2) The French and Spanish Defence Mission Centers serve the defence users of each country. A high agility requires a very compact design, with a few stiff appendages. It contains a large amount of bright nebulous material and several hundred stars, of which six or seven can be seen by the unaided eye and have figured prominently in the myths and literature of many cultures. The geometric model parameters are estimated in two steps. - The Pleiades twins now operate as a true constellation on the same orbit, allowing a daily revisit capability to guarantee the customer the right information at the right time. As images are bought under DSP licence, institutional partners from France, Belgium, Spain, Sweden and Austria can access those images for free, thanks to their affiliation to ORFEO program. Each Pléiades Neo satellite, based on the Airbus S950 optical platform, will add half a million km² of imagery per day to Airbus’ catalogue, and bring first rate performance: Higher agility for increased scene acquisition density over area of interest and stereo imaging, thanks to Control Momentum Gyroscopes and compact design The CCSDS protocol is used for all S/C communications. As a consequence, the instrument is integrated inside the bus. - The launch of the Pleiades-1B spacecraft is planned for the end of 2012 (Ref. design solutions for Pleiades are presented for the satellite (mechanical and thermal overall concept), the instrument, and then the bus. For Pleiades program applications, the requirements call for CMG fatigue failure modes in excess of 1.8 x 106 cycles under an average output torque of 19 Nm. The HMA project focuses on defining and providing five interfaces: 1) Catalog Service: browsing and retrieving metadata on collections and products across collaborating HMA catalogs, 2) Ordering Service: for products identified in a catalog, 3) Programming Service: submitting requests for new acquisitions to the HMA partner missions’ ground segments, 4) Mission Planning Service: facilitating preparation of programming requests. • A wide range of other satellite and aerial data. 43), 1) Astrium Geo-Information Services is the civil operator of Pleiades. It may take a long time to get the required scenes with no cloud, whilst atmospheric corrections need simultaneous measurements that are not always possible. Figure 1: the Pleiades-HR satellite The major constraints of weight and agility led to the It takes into account a geometric modelization of the satellite: orbit determination, attitude estimation, datation, viewing frame determination, focal length adjustment, viewing directions of all detectors, and a ground reference frame. The GMES program, an EU and EC initiative, with its multiple EO missions and data handling concepts by the various national entities within this program, implied no other way but to start the HMA initiative, a coordination effort of standard interfaces for the benefit of all parties involved (ESA, CNES, DLR, EUMETSAT, ASI, INTA, CSA, DMCii, etc.) (image credit: CNES). 21). Several types of acquisition modes are defined: • One-pass acquisition mode: The satellite agility offers the possibility to locally enlarge (widen) the swath by realizing from the same orbit and thus quasi simultaneously the acquisition of several adjacent swaths within the field of regard (FOR). 7). The ASAP-S structure has a total mass of 425kg, a total height of 1.841 m, and a diameter of 1.875 m. 22) 23), Launch: The Pleiades-1A spacecraft was launched on December 17, 2011 on a Soyuz ST launcher (with Fregat upper stage) from Europe's spaceport in Kourou, French Guiana (launch provider: Arianespace). The Pleiades spacecraft is not only capable to be controlled at a specific 3D attitude, but also with a tunable rotation rate. First satellite to be launched for creation of Pleiades constellation was Pleiades 1A. 5) Online Data Access Services: retrieving products from the online access archives offered through the HMA. Figure 36: Schematic view of HMA implementation at CNES (image credit: CNES). Calibration methods of the Pleiades program: For an earth observing satellite with no on-board calibration source like Pleiades, the commissioning phase is a critical quest of well-characterized earth landscapes and ground patterns that have to be imaged by the camera in order to compute or fit the parameters of the viewing models. Moreover, it allows a fine monitoring of the in-flight performance that can be compared to pre-flight expectations: up to now, the normalization monitoring confirms the need for an update of the parameters every 6 months, as expected on-ground. 5570, November 2004, pp. Ground tests are also mandatory to check the right signs of all the signed data : for example, the right sign of the TDI line transfer is compared to the expected velocity of the scene due to the satellite motion.

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