Third International Symposium on Space Mission Operations and Ground Data Systems, part 1

Under the theme of 'Opportunities in Ground Data Systems for High Efficiency Operations of Space Missions,' the SpaceOps '94 symposium included presentations of more than 150 technical papers spanning five topic areas: Mission Management, Operations, Data Management, System Development, and Systems Engineering. The papers focus on improvements in the efficiency, effectiveness, productivity, and quality of data acquisition, ground systems, and mission operations. New technology, techniques, methods, and human systems are discussed. Accomplishments are also reported in the application of information systems to improve data retrieval, reporting, and archiving; the management of human factors; the use of telescience and teleoperations; and the design and implementation of logistics support for mission operations

Remote Sensing

This dual conception of remote sensing brought us to the idea of preparing two different books; in addition to the first book which displays recent advances in remote sensing applications, this book is devoted to new techniques for data processing, sensors and platforms. We do not intend this book to cover all aspects of remote sensing techniques and platforms, since it would be an impossible task for a single volume. Instead, we have collected a number of high-quality, original and representative contributions in those areas

The geodesy of Mercury with the missions MESSENGER and BepiColombo

The work is organized in six chapters. Chapter 1 introduces briefly the exploration of Mercury highlighting the generic characteristics of the planet and its research with space probes. Chapter 2 is focused on the orbit determination for the geodesy of Mercury. We present here the overall description of radio science experiments, showing the measurements and the geodetic models, and the codes of the orbit determination for interplanetary spacecraft. Chapter 3 describes the MESSENGER mission and radio science experiment. Here, we report on the analysis of the radio tracking data showing the orbit reconstruction and the estimated model of the Hermean gravity field and ephemeris. Chapter 4 is about the mission BepiColombo and the Mercury Orbiter Radio science Experiment. We carried out a new set of numerical simulations that provides attainable accuracies in the gravity field estimation. Chapter 5 summarizes the consequences of the estimated Hermean gravity field on the geodesy of the planet and the orbit evolution of the BepiColombo spacecraft. Chapter 6 gives conclusions about our work

The geodesy of Mercury with the missions MESSENGER and BepiColombo

The work is organized in six chapters. Chapter 1 introduces briefly the exploration of Mercury highlighting the generic characteristics of the planet and its research with space probes. Chapter 2 is focused on the orbit determination for the geodesy of Mercury. We present here the overall description of radio science experiments, showing the measurements and the geodetic models, and the codes of the orbit determination for interplanetary spacecraft. Chapter 3 describes the MESSENGER mission and radio science experiment. Here, we report on the analysis of the radio tracking data showing the orbit reconstruction and the estimated model of the Hermean gravity field and ephemeris. Chapter 4 is about the mission BepiColombo and the Mercury Orbiter Radio science Experiment. We carried out a new set of numerical simulations that provides attainable accuracies in the gravity field estimation. Chapter 5 summarizes the consequences of the estimated Hermean gravity field on the geodesy of the planet and the orbit evolution of the BepiColombo spacecraft. Chapter 6 gives conclusions about our work

Radio spectroscopy and space science with VLBI radio telescopes for Solar System research

Only a tiny fraction of the universe has been studied even though the possibilities are unlimited given the current technologies, the resources and the time. To optimize the use of resources, the Metsähovi antenna and the existing VLBI processing hardware were exploited to study a broad variety of space phenomena. The research began with radio spectroscopy of the celestial bodies of our Solar System. Every object emits certain spectral signatures at several radio frequencies depending on its chemical molecules. Earth-based observations of the emitted radio spectral signal help to determine the composition of the structure and atmosphere of the planets. A unique method for processing the data captured by VLBI radio telescopes for radio spectroscopy purposes was developed during this work. Although the initial research focused on planetary bodies, it later shifted to the spacecraft motion. This new aim included studying ground support to planetary and deep-space mission spacecraft with VLBI radio telescopes, which opened up possibilities for collaboration between space agencies and radio astronomers. In addition, with VLBI phase-referencing, a high accuracy estimation of the spacecraft state vectors could be obtained. These new tools provide an opportunity for studying a broad variety of physical processes, including the dynamics of planetary atmospheres, geodynamical diagnostics of the interior of planets, fundamental physics effects of spacecraft motion and solar wind characterization. For instance, we organised a VLBI tracking session of Venus Express that involved 10 antennae and it estimated the spacecraft position with a precision of few hundred metres. The most interesting physical process for further investigation was the characterisation of the solar wind along the propagation path. The phase fluctuations on the signal allowed us to study essential parameters of the interplanetary scintillations, such as the phase scintillation index, bandwidth of scintillations or spectral broadening and their dependence on the solar elongation, distance to the target, celestial position of the spacecraft and radio telescopes. A scintillation and electron density model as a function of solar elongation was developed based on the data collected during two years. This model is powerful for improving the accurate determination of the spacecraft state vectors

Proceedings of the Sixth General Meeting of the International VLBI Service for Geodesy and Astrometry

This volume is the proceedings of the sixth General Meeting of the International VLBI Service for Geodesy and Astrometry (IVS), held in Hobart, Tasmania, Australia, February 7-13, 2010. The contents of this volume also appear on the IVS Web site at http://ivscc.gsfc.nasa.gov/publications/gm2010. The keynote of the sixth GM was the new perspectives of the next generation VLBI system under the theme "VLBI2010: From Vision to Reality". The goal of the meeting was to provide an interesting and informative program for a wide cross-section of IVS members, including station operators, program managers, and analysts. This volume contains 88 papers. All papers were edited by the editors for usage of the English language, form, and minor content-related issues

1995 BRAC Commission

Naval Research Lab: Data Call 12. Tabular data, memos, documents. Box 178, L-110

Journal of Telecommunications and Information Technology, 2001, nr 4

kwartalni

International VLBI Service for Geodesy and Astrometry 2008 Annual Report

This volume of reports is the 2008 Annual Report of the International VLBI Service for Geodesy and Astrometry (IVS). The individual reports were contributed by VLBI groups in the international geodetic and astrometric community who constitute the components of IVS. The 2008 Annual Report documents the work of these IVS components over the period January 1, 2008 through December 31, 2008. The reports document changes, activities, and progress of the IVS. The entire contents of this Annual Report also appear on the IVS Web site at http://ivscc.gsfc.nasa.gov/publications/ar2008

Deep Space Telecommunications Systems Engineering

Descriptive and analytical information useful for the optimal design, specification, and performance evaluation of deep space telecommunications systems is presented. Telemetry, tracking, and command systems, receiver design, spacecraft antennas, frequency selection, interference, and modulation techniques are addressed