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  • 1
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    High-spin level structures of the near-spherical nuclei 91,92Zr (2014)
    American Physical Society (APS)
    Details
    Publication Date: 2014-04-08
    Description: Author(s): Z. G. Wang, M. L. Liu, Y. H. Zhang, X. H. Zhou, S. Guo, J. G. Wang, X. G. Lei, Y. Zheng, Y. D. Fang, Y. H. Qiang, N. T. Zhang, B. Ding, G. S. Li, F. Ma, X. L. Yan, S. C. Wang, B. S. Gao, F. Fang, B. T. Hu, X. G. Wu, C. Y. He, and Y. Zheng High-spin level structures of the near-spherical nuclei 91,92Zr have been reinvestigated via the 82Se(13C, xn) (x=4,3) reactions at a beam energy of 44 MeV. By the use of in-beam spectroscopic methods, 13 new transitions belonging to 91Zr and 19 to 92Zr have been observed and the level schemes of 91... [Phys. Rev. C 89, 044308] Published Mon Apr 07, 2014
    Keywords: Nuclear Structure
    Print ISSN: 0556-2813
    Electronic ISSN: 1089-490X
    Topics: Physics
    Published by American Physical Society (APS)
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    PAPER CURRENT
  • 2
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    Some results in the fundamental geometric theory of onboard directional sensors (1975)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Fundamental geometric properties of interferometers, magnetometers, horizon scanners and star trackers are studied in order to derive a set of equations for standardizing these attitude sensors.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: NASA. Goddard Space Flight Center Flight Mech.(Estimation Theory Symp.; p 44-53
    Format: application/pdf
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  • 3
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    Navigation study for low-altitude Earth satellites (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This document describes several navigation studies for low-altitude Earth satellites. The use of Global Positioning System Navigation Package data for LANDSAT-5 orbit determination is evaluated. In addition, a navigation analysis for the proposed Tracking and Data Aquisition System is presented. This analysis, based on simulations employing one-way Doppler data, is used to determine the agreement between the Research and Development Goddard Trajectory Determination System and the Sequential Error Analysis Program results. Properties of several geopotential error models are studied and an exploratory study of orbit smoother process noise is presented.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-CR-177855 , NAS 1.26:177855 , CSC/TM-85/6119
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Short-term solar pressure effect and GM uncertainty on TDRS orbital accuracy: A study of the interaction of modeling error with tracking and orbit determination (1979)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The TDRS was modeled as a combination of a sun-pointing solar panel and earth-pointing plate. Based on this model, explanations are given for the following orbit determination error characteristics: inherent limits in orbital accuracy, the variation of solar pressure induced orbital error with time of the day of epoch, the insensitivity of range-rate orbits to GM error, and optimum bilateration baseline.
    Keywords: ASTRODYNAMICS
    Type: NASA. Goddard Space Flight Center Flight Mech.(Estimation Theory Symp.; p 229-329
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    On some solutions of ring shells. (1965)
    In:  Other Sources
    Details
    Publication Date: 2019-05-30
    Description: Hollow metallic O rings used for sealing as thin shells under axisymmetric loading
    Keywords: STRUCTURAL MECHANICS
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    An analysis of GDOP in global positioning system navigation (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The accuracy of user navigation fix based on the NAVSTAR global positioning system is described. The trace of this matrix serves as a convenient navigation performance index and the square root of the trace is called geometric dilution of precision (GDOP). Certain theoretical results concerning the general properties of the navigation performance are derived. An efficient algorithm for the computation of GDOP is given. Applications of the results are illustrated by numerical examples.
    Keywords: ASTRODYNAMICS
    Type: NASA. Goddard Space Flight Center Fifth Ann. Flight Mech.(Estimation Theory Symp.; 14 p
    Format: application/pdf
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  • 7
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    Geometric dilution of precision in Global Positioning System navigation (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The evaluation of the GPS navigation performance is essentially equivalent to the computation of the diagonal terms of the geometric dilution of precision (GDOP) matrix. Certain theoretical results concerning the general properties of the GDOP matrix are obtained. An efficient algorithm for the computation of the GDOP matrix and the navigation performance index is given; and applications of the results are illustrated by numerical examples.
    Keywords: AIRCRAFT COMMUNICATIONS AND NAVIGATION
    Type: Journal of Guidance and Control; 4; Jan
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    An evaluation of Global Positioning System data for Landsat-4 orbit determination (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The Navstar Global Positioning System (GPS) navigation data obtained from an experimental GPS receiver/processor package (GPSPAC) onboard the Landsat-4 spacecraft are evaluated for their accuracy and reliability for use in Landsat-4 orbit determination. Different orbit determination scenarios and methods are considered. The parameters estimated include a subset of three Landsat-4 clock parameters and an atmospheric drag coefficient, in addition to the orbital elements. It is found that Landsat-4 orbit solutions based on delta pseudorange data generally agree with the definitive solutions to the 50-meter level.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: AIAA PAPER 85-0286
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Geometric theory of horizon scanners (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The note presents a general geometrical theory of spacecraft horizon scanners for the purpose of actual attitude determination, as opposed to just attitude stabilization. Analysis is carried out in terms of the scanning angles and three sets of auxiliary axes: the scanner axes, the nonscanning axes, and the orbital axes. Euler angles (yaw, pitch, and roll) transform the orbital axes to the nonscanning axes, and spacecraft attitude is determined directly from the attitude of the nonscanning axes relative to the orbital axes. In most applications the scanning speed is fast, so that it can be assumed that the attitude of the spacecraft does not change during a scan; however, a perturbation analysis is provided for errors committed by neglecting attitude changes. The analysis is valid for all types of scanners; in addition, the case where two scanners with different half-cone angles are used is considered.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: Journal of Spacecraft and Rockets; 12; Dec. 197
    Format: text
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  • 10
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    A general geometric theory of attitude determination from directional sensing (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A general geometric theory of spacecraft attitude determination from external reference direction sensors was presented. Outputs of different sensors are reduced to two kinds of basic directional measurements. Errors in these measurement equations are studied in detail. The partial derivatives of measurements with respect to the spacecraft orbit, the spacecraft attitude, and the error parameters form the basis for all orbit and attitude determination schemes and error analysis programs and are presented in a series of tables. The question of attitude observability is studied with the introduction of a graphical construction which provides a great deal of physical insight. The result is applied to the attitude observability of the IMP-8 spacecraft.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: NASA-CR-144744
    Format: application/pdf
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