Channel and terminal description of the ACTS mobile terminal

The Advanced Communications Technology Satellite (ACTS) Mobile Terminal (AMT) is a proof-of-concept K/Ka-band mobile satellite communications terminal under development by NASA at JPL. Currently the AMT is undergoing system integration and test in preparation for a July 1993 ACTS launch and the subsequent commencement of mobile experiments in the fall of 1993. The AMT objectives are presented followed by a discussion of the AMT communications channel and mobile terminal design and performance

ESA Tracking Systems

International Telemetering Conference Proceedings / October 26-29, 1992 / Town and Country Hotel and Convention Center, San Diego, CaliforniaThis paper presents the tracking systems currently used at ESA. Two systems are described: Meteosat Ranging System (MRS), and Multi-Purpose Tracking System (MPTS). The MRS is presently in operational use on Meteosat. It has been designed to meet the need for a simultaneous multi-point ranging in a channel shared with other services. As a result, a new code ranging technique, based on split-phase-level data formats, has been designed and developed. The MPTS (previously Deep Space Tracking System - DSTS) was first developed and deployed for the Giotto mission. At a later stage, a near-earth capability has been added to the system, thereby creating a truly multi-purpose tracking system. The ranging signal employed in the MPTS makes use of the good properties of both the PN code type of ranging system and the tone ranging system. The concept, architectural design, capabilities and performance of these systems are presented in this paper. Finally, insight into the European Data Relay Satellite and Data Relay User Satellite ranging systems is given.International Foundation for TelemeteringProceedings from the International Telemetering Conference are made available by the International Foundation for Telemetering and the University of Arizona Libraries. Visit http://www.telemetry.org/index.php/contact-us if you have questions about items in this collection

Study of b−b-hadron decays to Λc+h−h′−\Lambda_c^+h^-h^{\prime -} final states

Decays of $\Xi_{b}^{-}$ and $\Omega_{b}^{-}$ baryons to $\Lambda_{c}^{+} h^- h^{\prime -}$ final states, with $h^- h^{\prime -}$ being $\pi^{-}\pi^{-}$, $K^{-}\pi^{-}$ and $K^{-}K^{-}$ meson pairs, are searched for using data collected with the LHCb detector. The data sample studied corresponds to an integrated luminosity of $8.7 \rm fb^{-1}$ of $pp$ collisions collected at centre-of-mass energies $\sqrt{s} = 7$, $8$ and $13 \rm TeV$. The products of the relative branching fractions and fragmentation fractions for each signal mode, relative to the $B^{-} \rightarrow \Lambda_{c}^{+} \bar{p} \pi^{-}$ mode, are measured, with $\Xi_{b}^{-} \rightarrow\Lambda_{c}^{+} K^{-} \pi^{-}$, $\Xi_{b}^{-} \rightarrow\Lambda_{c}^{+} K^{-} K^{-}$ and $\Omega_{b}^{-} \rightarrow\Lambda_{c}^{+} K^{-} K^{-}$ decays being observed at over $5\,\sigma$ significance. The $\Xi_{b}^{-} \rightarrow\Lambda_{c}^{+} K^{-} \pi^{-}$ mode is also used to measure the $\Xi_{b}^{-}$ production asymmetry, which is found to be consistent with zero. In addition, the $B^{-} \rightarrow \Lambda_{c}^{+} \bar{p} K^{-}$ decay is observed for the first time, and its branching fraction is measured relative to that of the $B^{-} \rightarrow \Lambda_{c}^{+} \bar{p} \pi^{-}$ mode.Decays of $\Xi_b^-$ and $\Omega_b^-$ baryons to $\Lambda_c^+ h^- h^{\prime -}$ final states, with $h^- h^{\prime -}$ being $\pi^-\pi^-$, $K^-\pi^-$ and $K^-K^-$ meson pairs, are searched for using data collected with the LHCb detector. The data sample studied corresponds to an integrated luminosity of $8.7\,\mathrm{fb}^{-1}$ of $pp$ collisions collected at centre-of-mass energies $\sqrt{s} = 7$, $8$ and $13\,\mathrm{Te\kern -0.1em V}$. The products of the relative branching fractions and fragmentation fractions for each signal mode, relative to the $B^- \to \Lambda_c^+ \overline{p} \pi^-$ mode, are measured, with $\Xi_{b}^- \to\Lambda_{c}^+ K^- \pi^-$, $\Xi_{b}^- \to\Lambda_{c}^+ K^- K^-$ and $\Omega_{b}^- \to\Lambda_{c}^+ K^- K^-$ decays being observed at over $5\,\sigma$ significance. The $\Xi_{b}^- \to\Lambda_{c}^+ K^- \pi^-$ mode is also used to measure the $\Xi_{b}^-$ production asymmetry, which is found to be consistent with zero. In addition, the $B^- \to \Lambda_{c}^+ \overline{p} K^-$ decay is observed for the first time, and its branching fraction is measured relative to that of the $B^- \to \Lambda_{c}^+ \overline{p} \pi^-$ mode