Download or read book Gravity Gradients at Satellite Altitudes written by B. Chovitz and published by . This book was released on 1973 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Nationalisation of Trinity College Dublin as a Propsed Solution of Irish University Education written by and published by . This book was released on 1900 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book On the Gravity Gradient at Satellite Altitudes written by Walter Köhnlein and published by . This book was released on 1967 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book On the Gravity Gradient at Satellite Altitudes written by Walter J.. Koehnlein and published by . This book was released on 1967 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Gravity Gradients on the Earth s Surface as Deduced from Satellite Orbits written by Walter Köhnlein and published by . This book was released on 1967 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Optimized Performance of an Articulated Gravity Gradient Satellite at Synchronous Altitude microform written by P. C. Hughes and published by National Library of Canada. This book was released on 1966 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt: A geometrically and dynamically symmetrical articulated satellite is considered for possible application at synchronous altitudes. The perturbing influence of solar radiation pressure on the two vertical hinged booms is studied, and the small-angle equations of motion derived. From these equations, both the transient and steady-state pointing performance are optimized through a computer search. Pointing errors of the order of two degrees, and damping times less than one orbit are shown to be possible for a weight expenditure of forty-five pounds (satellite payload weight = 250 pounds). (Author).

Download or read book Symposium on Passive Gravity Gradient Stabilization Ames Research Center Moffett Field California May 10 11 1965 written by and published by . This book was released on 1966 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Advanced Techniques for Analyzing and Improving Gravity Gradient Satellite Pointing Accuracies at High Orbital Altitudes Volume Ii Appendices written by J. L. Palmer and published by . This book was released on 1967 with total page 91 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Advanced Techniques for Analyzing and Improving Gravity Gradient Satellite Pointing Accuracies at High Orbital Altitudes Volume I Analysis written by J. L. Palmer and published by . This book was released on 1967 with total page 205 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study is directed toward the investigation of the problems, and possible solutions, associated with high pointing accuracies for gravity gradient systems at high orbital altitudes. Two major areas of investigation are considered. In the area of system response, consideration is given to determining the configuration parameters and design techniques which provide the greatest tolerance to disturbance torques. In the area of disturbances, the parameters and design techniques which minimize the amplitudes of the disturbance torques are considered. Specific objectives were to present fundamental gravity gradient characteristics and show methods of analysis. The problem areas are defined by presenting the detailed basic characteristics of a simple single body system and noting its deficiencies. A series of candidate designs are obtained by augmenting the single body system with design techniques which tend to remove its deficiencies. The analytical approach consists of studying the relationship of the system singularities with respect to harmonics of orbit rate. It is shown that for a system with properly located singularities, the influencing parameters in determining ultimate state response are the proper pole and zero locations and damping has a minor effect. The analysis is presented in Volume I and the derivation of dynamic equations, disturbance expressions, and station keeping parameters is contained in Volume II. (Author).

Download or read book Advanced Techniques for Analyzing and Improving Gravity Gradient Satellite Pointing Accuracies at High Orbital Altitudes written by J. L. Palmer and published by . This book was released on 1967 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Optimized Performance of an Articulated Gravity Gradient Satellite at Synchronous Altitude written by P. C. Hughes and published by . This book was released on 1966 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt: A geometrically and dynamically symmetrical articulated satellite is considered for possible application at synchronous altitudes. The perturbing influence of solar radiation pressure on the two vertical hinged booms is studied, and the small-angle equations of motion derived. From these equations, both the transient and steady-state pointing performance are optimized through a computer search. Pointing errors of the order of two degrees, and damping times less than one orbit are shown to be possible for a weight expenditure of forty-five pounds (satellite payload weight = 250 pounds). (Author).

Download or read book Gravity Geoid and Height Systems written by Urs Marti and published by Springer. This book was released on 2015-01-13 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume includes a selection of papers presented at the IAG international symposium "Gravity, Geoid and Height Systems 2012" (GGHS2012), which was organized by IAG Commission 2 “Gravity Field” with the assistance of the International Gravity Field Service (IGFS) and GGOS Theme 1 “Unified Global Height System”. The book summarizes the latest results on gravimetry and gravity networks, global gravity field modeling and applications, future gravity field missions. It provides a detailed compilation on advances in precise local and regional high-resolution geoid modeling, the establishment and unification of vertical reference systems, contributions to gravity field and mass transport modeling as well as articles on the gravity field of planetary bodies.

Download or read book Review of Artificial Satellite Gravity Gradiometer Techniques for Geodesy written by Robert L. Forward and published by . This book was released on 1973 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper reviews the development status of gravity gradiometer instrumentation and the utilization of these gradiometers in earth orbiting artificial satellites for geodesy. Recent studies have shown that gravity gradiometers in artificial satellites operated in a low altitude polar orbit could produce in 20 to 30 days a complete map of the higher order harmonics (25 to 75 degree and order) of the earth's gravity field provided the instrumentation flown has a sensitivity of 0.01 EU (10 to the minus 11 sec to the -2 = 1 ngal/m) for a 35 sec integration time. During the past decade gravity gradiometer development efforts have produced instrumentation which have measured gravity gradients in the laboratory and in orbit and which can be made to operate at the 0.01 EU sensitivity level in an orbital environment. Special emphasis is placed on the instrument concepts that can easily be increased in size from their present configuration to obtain the desired sensor signal-to-noise and which use spacecraft rotation modulation of the gravity gradient signal to aid in reducing externally generated noise to below the 0.01 EU level. (Author).

Download or read book Satellite Gravimetry and the Solid Earth written by Mehdi Eshagh and published by Elsevier. This book was released on 2020-09-15 with total page 502 pages. Available in PDF, EPUB and Kindle. Book excerpt: Satellite Gravimetry and the Solid Earth: Mathematical Foundations presents the theories behind satellite gravimetry data and their connections to solid Earth. It covers the theory of satellite gravimetry and data analysis, presenting it in a way that is accessible across geophysical disciplines. Through a discussion of satellite measurements and the mathematical concepts behind them, the book shows how various satellite measurements, such as satellite orbit, acceleration, vector gravimetry, gravity gradiometry, and integral energy methods can contribute to an understanding of the gravity field and solid Earth geophysics. Bridging the gap between geodesy and geophysics, this book is a valuable resource for researchers and students studying gravity, gravimetry and a variety of geophysical and Earth Science fields. Presents mathematical concepts in a pedagogic and straightforward way to enhance understanding across disciplines Explains how a variety of satellite data can be used for gravity field determination and other geophysical applications Covers a number of problems related to gravimetry and the gravity field, as well as the effects of atmospheric and topographic factors on the data Addresses the regularization method for solving integral equations, isostasy based on gravimetric and flexure methods, elastic thickness, and sub-lithospheric stress

Download or read book Gravity Gradient Stabilization Studies with the Dodge Satellite written by Robert E. Fischell and published by . This book was released on 1970 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt: The DODGE satellite was launched on 1 July 1967 into a near-synchronous orbit to demonstrate gravity-gradient stabilization at that high altitude and to experiment with various design parameters and damping techniques. This satellite was the first to be three-axis stabilized at high altitude using gravity-gradient techniques. It continues to function satisfactorily to the present date. Stabilization in pitch and roll to better than plus or minus 10 degrees has been obtained. The yaw stabilization of plus or minus 45 degrees has been fairly consistent; with the assistance of a small angular momentum flywheel, yaw accuracy of plus or minus 20 degrees was achieved. Magnetic damping of the sample-and-hold type and simulated hysteresis were both successful in damping librations. Efforts with the torsion-wire-suspended damper boom scheme were not successful, probably because of a mechanical bias in the device. A television camera system permitted observation of the boom bending under the influence of solar heating. Mechanical hysteresis in the boom bending was observed. (Author).

Download or read book U S Aeronautics and Space Activities written by United States. President and published by . This book was released on 1964 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Aeronautics and Space Report of the President Activities written by United States. President and published by . This book was released on 1963 with total page 1372 pages. Available in PDF, EPUB and Kindle. Book excerpt: