Download or read book A Laser System for Satellite Geodesy written by Robert L. Iliff and published by . This book was released on 1970 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: A novel laser system designed and developed for satellite illumination is based on the use of two ruby lasers. It obtains range with a Q-switched laser and angular information by photographing satellite-reflected high-energy normal-mode laser pulses against stellar fields. The Q-switched laser system, operated in a controlled multipulse mode, is capable of up to 10 range measurements in a single pumping period. This increases confidence in the validity of the measurements especially since they are obtained in the presence of the high background noise that is encountered in daylight range measurements. The difference in satellite range within a 400-microsec time frame has been observed by means of the multipulse approach. (Author).
Download or read book A Laser System for Satellite Geodesy written by Robert L. Iliff and published by . This book was released on 1970 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A novel laser system designed and developed for satellite illumination is based on the use of two ruby lasers. It obtains range with a Q-switched laser and angular information by photographing satellite-reflected high-energy normal-mode laser pulses against stellar fields. The Q-switched laser system, operated in a controlled multipulse mode, is capable of up to 10 range measurements in a single pumping period. This increases confidence in the validity of the measurements especially since they are obtained in the presence of the high background noise that is encountered in daylight range measurements. The difference in satellite range within a 400-microsec time frame has been observed by means of the multipulse approach. (Author)
Download or read book High Energy Laser System for Geodetic Research written by Sumner Ackerman and published by . This book was released on 1965 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt: The design, operation, and performance of a high-energy laser system developed specifically for geodetic satellite research are described. The ground-based laser illuminator uses a liquid-N2-cooled 16-mm (diameter) by 184-mm (length) ruby crystal. It has a nominal output of 250 joules at 6935 A with 17,000 joules of pump supply and a pulse duration of 2.5 milliseconds. Discussion of the system's performance is based on 15 months of operating experience which has shown that high-energy lasers are practical for geodetic research applications requiring long periods of reliable operation under outdoor field conditions. The feasibility of Project LARGOS (Laser-Activated Reflecting Geodetic Optical Satellite), sponsored by the Terrestrial Sciences Laboratory of AFCRL, was verified experimentally using this equipment when clearly detectable star images of the Explorer 22 Satellite were obtained on 21 January, 29 January, and 3 February 1965 at ranges up to 925 statute miles. Range measurements by photoelectric detection were obtained simultaneously. A study was made of cube-corner reflectors suitable for satellite geodesy showing that, ideally, these should be almost diffraction limited with an aperture of the correct diameter to obtain the desired beamwidth.
Download or read book Satellite Geodesy written by Günter Seeber and published by Walter de Gruyter. This book was released on 2008-08-22 with total page 613 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers the entire field of satellite geodesy and is intended to serve as a textbook for advanced undergraduate and graduate students, as well as a reference for professionals and scientists in the fields of engineering and geosciences such as geodesy, surveying engineering, geomatics, geography, navigation, geophysics and oceanography. The text provides a systematic overview of fundamentals including reference systems, time, signal propagation and satellite orbits, together with observation methods such as satellite laser ranging, satellite altimetry, gravity field missions, very long baseline interferometry, Doppler techniques, and Global Navigation Satellite Systems (GNSS). Particular emphasis is given to positioning techniques, such as the NAVSTAR Global Positioning System (GPS), and to applications. Numerous examples are included which refer to recent results in the fields of global and regional control networks; gravity field modeling; Earth rotation and global reference frames; crustal motion monitoring; cadastral and engineering surveying; geoinformation systems; land, air, and marine navigation; marine and glacial geodesy; and photogrammetry and remote sensing. This book will be an indispensable source of information for all concerned with satellite geodesy and its applications, in particular for spatial referencing, geoinformation, navigation, geodynamics, and operational positioning.
Download or read book Satellite Laser Ranging in the 1990s Report of the 1994 Belmont Workshop written by and published by . This book was released on 1994 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Satellite Laser Ranging in the 1990s written by John James Degnan and published by . This book was released on 1994 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Space Geodesy Satellite Laser Ranging System Requirements Document Public Version written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-05-23 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: This document gives the Level 3 and Level 4 requirements for SGSLR. McGarry, Jan Goddard Space Flight Center CELESTIAL GEODESY; SATELLITE LASER RANGING; GEODETIC SATELLITES; LASER RANGE FINDERS; COMPUTER PROGRAMS; COMMUNICATION; REQUIREMENTS; LASER RANGING; OPTICAL PATHS; GIMBALS; SIGNAL DETECTORS; CONTROL EQUIPMENT; SAFETY MANAGEMENT; TIME SIGNALS
Download or read book Description and Operation of a Satellite Laser System written by Seppo J. Halme and published by . This book was released on 1977 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Determination of Precise Satellite Orbits and Geodetic Parameters using Satellite Laser Ranging written by Krzysztof Sośnica and published by Astronomical Institute, University of Bern, Switzerland. This book was released on 2014-04-07 with total page 253 pages. Available in PDF, EPUB and Kindle. Book excerpt: The contribution of Satellite Laser Ranging (SLR) to the definition of the origin of the reference frame (geocenter coordinates), the global scale, and low degree coefficients of the Earth's gravity field is essential due to the remarkable orbit stability of geodetic satellites and the accuracy of laser observations at a level of a few millimeters. Considering these aspects, SLR has an exceptional potential in establishing global networks and deriving geodetic parameters of the supreme quality. SLR faces today the highest requirements of the Global Geodetic Observing System (GGOS) yielding 1 mm of long-term station coordinate and 0.1 mm/y of station velocity stability. The goal of this work is to assess the contribution of the latest models and corrections to the SLR-derived parameters, to enhance the quality and reliability of the SLR-derived products, and to propose a new approach of orbit parameterization for low orbiting geodetic satellites. The impact of orbit perturbations is studied in detail, including perturbing forces of gravitational origin (Earth's gravity field, ocean and atmosphere tides) and perturbing forces of non-gravitational origin (atmospheric drag, the Yarkovsky effect, albedo and Earth's infrared radiation pressure). A multi-satellite combined solution is obtained using SLR observations to LAGEOS-1, LAGEOS-2, Starlette, Stella, and AJISAI. The quality of the SLR-derived parameters from the combined solution is compared with external solutions. The Earth rotation parameters are compared to the IERS-08-C04 series and the GNSS-derived series, whereas the time variable Earth's gravity field coefficients are compared to the CHAMP and GRACE-derived results.
Download or read book Use of Artificial Earth Satellites for Geodesy written by A. P. Polezhayev and published by . This book was released on 1966 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sciences of Geodesy I written by Guochang Xu and published by Springer Science & Business Media. This book was released on 2010-09-09 with total page 507 pages. Available in PDF, EPUB and Kindle. Book excerpt: This series of reference books describes sciences of different elds in and around geodesy with independent chapters. Each chapter covers an individual eld and describes the history, theory, objective, technology, development, highlights of research and applications. In addition, problems as well as future directions are discussed. The subjects of this reference book include Absolute and Relative Gravimetry, Adaptively Robust Kalman Filters with Applications in Navigation, Airborne Gravity Field Determination, Analytic Orbit Theory, Deformation and Tectonics, Earth Rotation, Equivalence of GPS Algorithms and its Inference, Marine Geodesy, Satellite Laser Ranging, Superconducting Gravimetry and Synthetic Aperture Radar Interferometry. These are individual subjects in and around geodesy and are for the rst time combined in a unique book which may be used for teaching or for learning basic principles of many subjects related to geodesy. The material is suitable to provide a general overview of geodetic sciences for high-level geodetic researchers, educators as well as engineers and students. Some of the chapters are written to ll literature blanks of the related areas. Most chapters are written by well-known scientists throughout the world in the related areas. The chapters are ordered by their titles. Summaries of the individual chapters and introductions of their authors and co-authors are as follows. Chapter 1 “Absolute and Relative Gravimetry” provides an overview of the gravimetric methods to determine most accurately the gravity acceleration at given locations.
Download or read book AFCRL Contributions to the National Geodetic Satellite Program NGSP written by George Hadgigeorge and published by . This book was released on 1974 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contents: The use of artificial satellites for geodesy; Satellite and ground instrumentation; AFCRL laser-satellite geodesy; AFCRL geodetic dual laser system; Intervisible (geometric) adjustment theory; Short arc geodetic adjustment (SAGA) theory; Geometric results from geodetic satellite (ANNA 1B) optical data; Improvement of the GEOS-1 North American tracking network from multiple short arc geodetic adjustments; Near term prospects for positional accuracies of 0.1 to 1.0 meters from satellite geodesy; Results from simulations of continuously integrated doppler for precise aircraft positioning; Simultaneous recovery of satellite and station positions utilizing the short arc method; Least-squares collocation method for combination of satellite-derived gravitational and terrestrial gravity.
Download or read book Design Study of Advanced Geodetic Laser System written by Sumner Ackerman and published by . This book was released on 1966 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Geodetic Laser System described herein is to generate two intense beams of radiant energy so that a portion reflected from an assembly of retrodirective reflectors on a satellite can produce a detectable and identifiable point image on a photographic plate and an unambiguous photoelectric voltage pulse. The photographic image, taken against a calibrated stellar background, will be used to measure the angular position of the satellite, and the photoelectric signal to measure its slant range. These measurements will be made almost simultaneously and together establish the vector displacement between the ground-based laser system and the satellite at the time of observation. The distance to the satellite is generally more than 1000 km. The desired accuracies of the angular and range measurements are to less than 2 arc-seconds and to less than 10 meters respectively. Multiple observations will be made in each orbital pass to enhance identification of the photographic image and collect more data. The requirements and specifications for all major system components are established so that a reasonable compromise between desired performance and costs will be achieved. Design is carried out in detail only to the point of assurance that technological state-of-the-art exists which is consistent with the system requirements and the specifications. (Author).
Download or read book Precise Geodetic Infrastructure written by National Research Council and published by National Academies Press. This book was released on 2010-10-25 with total page 157 pages. Available in PDF, EPUB and Kindle. Book excerpt: Geodesy is the science of accurately measuring and understanding three fundamental properties of Earth: its geometric shape, its orientation in space, and its gravity field, as well as the changes of these properties with time. Over the past half century, the United States, in cooperation with international partners, has led the development of geodetic techniques and instrumentation. Geodetic observing systems provide a significant benefit to society in a wide array of military, research, civil, and commercial areas, including sea level change monitoring, autonomous navigation, tighter low flying routes for strategic aircraft, precision agriculture, civil surveying, earthquake monitoring, forest structural mapping and biomass estimation, and improved floodplain mapping. Recognizing the growing reliance of a wide range of scientific and societal endeavors on infrastructure for precise geodesy, and recognizing geodetic infrastructure as a shared national resource, this book provides an independent assessment of the benefits provided by geodetic observations and networks, as well as a plan for the future development and support of the infrastructure needed to meet the demand for increasingly greater precision. Precise Geodetic Infrastructure makes a series of focused recommendations for upgrading and improving specific elements of the infrastructure, for enhancing the role of the United States in international geodetic services, for evaluating the requirements for a geodetic workforce for the coming decades, and for providing national coordination and advocacy for the various agencies and organizations that contribute to the geodetic infrastructure.
Download or read book STUDIES FOR A GEODETIC LASER SYSTEM written by Sumner Ackerman and published by . This book was released on 1967 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report contains a brief summary of photoelectric (range) detection, photographic (direction) detection, and design studies made for a geodetic laser system. It appears feasible to measure the displacement between a ground-based (ruby) laser system and a satellite equipped with retrodirective reflector arrays (such as those on the Explorer and Geos satellites) to an accuracy of 2 arc-seconds in direction and less than 10 meters in range at slant ranges of over 2000 km, using essentially state-of-the-art equipment described herein and in the references. The probability of detection is expected to be greater than 90% without optical tracking, if the direction is known in advance to within approximately 2 arc-minutes and the range to within approximately 1 km. (Author).
Download or read book Evolving the Geodetic Infrastructure to Meet New Scientific Needs written by National Academies of Sciences, Engineering, and Medicine and published by National Academies Press. This book was released on 2020-03-31 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt: Satellite remote sensing is the primary tool for measuring global changes in the land, ocean, biosphere, and atmosphere. Over the past three decades, active remote sensing technologies have enabled increasingly precise measurements of Earth processes, allowing new science questions to be asked and answered. As this measurement precision increases, so does the need for a precise geodetic infrastructure. Evolving the Geodetic Infrastructure to Meet New Scientific Needs summarizes progress in maintaining and improving the geodetic infrastructure and identifies improvements to meet new science needs that were laid out in the 2018 report Thriving on Our Changing Planet: A Decadal Strategy for Earth Observation from Space. Focusing on sea-level change, the terrestrial water cycle, geological hazards, weather and climate, and ecosystems, this study examines the specific aspects of the geodetic infrastructure that need to be maintained or improved to help answer the science questions being considered.
Download or read book Contributions of Space Geodesy to Geodynamics written by David E. Smith and published by . This book was released on with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
