Browsing by Author "Paris, C."
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Item An Addition to the Suite of Geodetic Satellites Supporting the ITRF: LARES-2(2022-12-27) Kuzmicz-Cieslak, M.; Pavlis, Erricos C.; Ciufolini, I.; Paolozzi, A.; Paris, C.Geodetic network infrastructure has evolved with increasing pace the past decade with remarkable additions of modern hardware, replacing aging, '80s vintage equipment throughout the globe. The Satellite Laser Ranging-SLR network is the slowest in making changes designed and planned more than a decade ago [Pearlman et al., 2019a]. This is in part due to the voluntary nature of establishing such installations and to a greater part the high cost and limited availability of the one-of-a-kind equipment. NASA, partners and international agencies, embarked on updates with standardization will help in the long term [Merkowitz et al., McGarry et al., Wilkinson, et al., 2019]. SLR needs more than updating the network to deliver the accuracy required today. New "targets" must also be used that support mm-accuracy. LAGEOS was conceived and built in the early '70s with a ~5 mm accuracy in mind [Pearlman et al., 2019b]. This limitation forced analysts to develop approaches of data analysis to ensure that even with such data one can reach the required 1-mm accuracy [Luceri et al., 2019]. Along with the network updates a parallel effort was thus initiated to modernize the space segment as well. Initially with the design and launch of LARES in 2012 [Pavlis et al., 2015] and following that, the design of LARES-2 [Ciufolini et al., 2017, Paolozzi et al., 2019], which was successfully launched on July 13, 2022 [https://www.nature.com/articles/d41586-022-02034-x]. The new mm-accurate target was quickly acquired first by the Matera, Italy station only three days after launch and although very early in the mission, the data were of remarkably high quality and insignificant bias. This prompted a quick evaluation and a test inclusion of this target in the limited list of SLR targets supporting the ITRF development. With an orbit nearly identical to LAGEOS (with supplementary inclination), taking full advantage of all the appropriate models designed and applied to LAGEOS, we achieved 7-day orbital fits of 3-5 mm even without a tuned target signature correction! We will present an overview of the initial analysis of LARES-2 data focusing on comparing them to contemporaneously taken LAGEOS data, we will show results from our initial inclusion of LARES-2 in developing ILRS products for ITRF development and discuss the ILRS plans for its full integration. Ciufolini, Phys. Rev. Lett (1986) Ciufolini, Int. J. of Mod. Phys. A (1989) Pearlman et al., J Geod 93, 2161-2180 (2019a). https://doi.Item LARES (LAser RElativity Satellite): Status Report(Instituto Nazionale di Fisica Nucleare, 2008-05-21) Boni, A.; Cantone, C.; Dell’Agnello, S.; Delle Monache, G. O.; Franceschi, M. A.; Garattini, M.; Intaglietta, N.; Lops, C.; Martini, M.; Maiello, M.; Prosperi, C.; Bellettini, G.; Tauraso, R.; March, R.; Ciufolini, I.; Berardi, S.; Cerruti, C.; Graziani, F.; Ialongo, P.; Lucantoni, A.; Paolozzi, A.; Peroni, I.; Paris, C.; Sindoni, G.; Vendittozzi, C.; Currie, D. G.; Arnold, D.; Rubincam, D. P.; Pavlis, Erricos C.; Matzner, R.; Slabinski, V. J.Item Orbital predictions for the LARES satellite mission(IEEE, 2015-06-04) Sindoni, G.; Paolozzi, A.; Paris, C.; Ciufolini, I.LARES is an Italian Space Agency satellite specifically designed, built and launched to test general relativity. It is a passive satellite covered with Cube Corner Reflectors that reflect laser pulses from tracking stations, thus allowing accurate measurement of the distance. That in turn enables accurate orbit reconstruction that is a key ingredient to allow the measurement of the tiny Lense-Thirring effect predicted by general relativity. The International Space Time Analysis Research Center provides the International Laser Ranging Service-ILRS, the orbital predictions for LARES for pointing of the tracking telescopes toward the target. The paper describes the technical aspects of generating the orbital predictions.Item Quality assessment of LARES satellite ranging data(IEEE\, 2015-06-05) Pavlis, Erricos C.; Paolozzi, A.; Paris, C.; Ciufolini, I.; Sindoni, G.LARES is an Italian Space Agency mission designed to test General Relativity in the weak field of Earth. In particular, the satellite will be able to measure frame-dragging with an accuracy of about 1%. The difficulty of the measurement is mainly due to the perturbations acting on the satellite and the relatively tiny size of the effect, amounting to about 118 milliarcseconds/year. LARES will also provide data to geodesists and it will contribute to GNSS by improving the origin definition of the International Terrestrial Reference Frame. The mission was designed and the satellite subsystems built and tested in less than four years. The short time to launch and the very limited budget of the LARES mission, raised doubts whether LARES could be, as expected by design, one of the best satellite laser ranging targets. The best way to confirm the success of the mission is to look at the range residuals from the primary stations of the International Laser Ranging Service (ILRS). In the paper it will be shown that from the majority of these stations LARES behaves as the best target.Item Studies on the materials of LARES 2 satellite(Springer Berlin Heidelberg, 2019-11-16) Paolozzi, A.; Sindoni, G.; Felli, F.; Pilone, D.; Brotzu, A.; Ciufolini, I.; Pavlis, Erricos C.; Paris, C.LARES 2 is an Italian Space Agency (ASI) satellite designed for testing with unprecedented accuracy frame-dragging, a fundamental prediction of General Relativity, and to contribute to space geodesy with a precision higher than any other satellite presently in orbit. The choice of the material for the body of LARES 2 satellite determines, along with its dimensions, the surface-to-mass ratio minimization which is the main requirement for the satellite. The paper will report the studies conducted for the fulfilment of the above mentioned requirement and the tests performed to qualify the materials for construction of the the satellite.