Browsing by Author "Sindoni, G."
Now showing 1 - 6 of 6
Results Per Page
Sort Options
Item The Earth's frame-dragging via laser-ranged satellites: A Response to "Some considerations on the present-day results for the detection of frame-dragging after the final outcome of GP-B" by Iorio L.(IOP, 2011-10-24) Ries, J. C.; Ciufolini, I.; Pavlis, Erricos C.; Paolozzi, A.; Koenig, R.; Matzner, R. A.; Sindoni, G.; Neumayer, H.In this letter, we reply to the preceding paper by Iorio (EPL, 96 (2011) 30001 (this issue)), hereafter referred to as I2011, where we address criticisms regarding the Lense-Thirring frame-dragging experiment results obtained from the laser ranging to the two LAGEOS satellites.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 Monte Carlo simulations of the LARES space experiment to test General Relativity and fundamental physics(IOP, 2013-10-08) Ciufolini, I.; Monge, B Moreno; Paolozzi, A.; Koenig, R.; Sindoni, G.; Michalak, G.; Pavlis, Erricos C.The LARES (LAser RElativity Satellite) satellite was successfully launched in February 2012. The LARES space experiment is based on the orbital determinations of the laser ranged satellites LARES, LAGEOS (LAser GEOdynamics Satellite) and LAGEOS 2 together with the determination of the Earth's gravity field by the GRACE (Gravity Recovery And Climate Experiment) mission. It will test some fundamental physics predictions and provide accurate measurements of the frame-dragging effect predicted by Einstein's theory of General Relativity. By 100 Monte Carlo simulations of the LARES experiment, with simulations of the orbits of LARES, LAGEOS and LAGEOS 2 according to the latest GRACE gravity field determinations, we found that the systematic errors in the measurement of frame-dragging amount to about 1.4% of the general relativistic effect, confirming previous error analyses.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.