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  • 1990-1994  (188)
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Language
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Year
  • 1
    Monograph available for loan
    Monograph available for loan
    München [u.a.] : Hanser [u.a.]
    Call number: 18/M 92.0887
    Type of Medium: Monograph available for loan
    Pages: XIII, 424 S.
    ISBN: 3446156933
    Uniform Title: The design of the UNIX operating system
    Classification: C.2.3.
    Language: German
    Location: Reading room
    Branch Library: GFZ Library
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  • 2
    Call number: PIK N 070-96-0026
    Type of Medium: Monograph available for loan
    ISBN: 185383081x , 1-85383-080-1
    Branch Library: PIK Library
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  • 3
    Publication Date: 2013-08-31
    Description: The evolution in the use of state estimation is traced for the analysis of aircraft flight data. A unifying mathematical framework for state estimation is reviewed, and several examples are presented that illustrate a general approach for checking instrument accuracy and data consistency, and for estimating variables that are difficult to measure. Recent applications associated with research aircraft flight tests and airline turbulence upsets are described. A computer program for aircraft state estimation is discussed in some detail. This document is intended to serve as a user's manual for the program called SMACK (SMoothing for AirCraft Kinematics). The diversity of the applications described emphasizes the potential advantages in using SMACK for flight-data analysis.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-RP-1252 , NAS 1.61:1252 , A-88203
    Format: application/pdf
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  • 4
    Publication Date: 2011-08-24
    Description: An attitude control law is derived to realize linear unforced error dynamics with the attitude error defined in terms of rotation group algebra (rather than vector algebra). Euler parameters are used in the rotational dynamics model because they are globally nonsingular, but only the minimal three Euler parameters are used in the error dynamics model because they have no nonlinear mathematical constraints to prevent the realization of linear error dynamics. The control law is singular only when the attitude error angle is exactly pi rad about any eigenaxis, and a simple intuitive modification at the singularity allows the control law to be used globally. The forced error dynamics are nonlinear but stable. Numerical simulation tests show that the control law performs robustly for both initial attitude acquisition and attitude control.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: Journal of Guidance, Control, and Dynamics (ISSN 0731-5090); 16; 1; p. 182-189.
    Format: text
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  • 5
    Publication Date: 2011-08-24
    Description: Work done on the NASA-Ames data base of digital flight records from airliners involved in severe turbulence incidences is summarized. The summary includes descriptions of the archived cases, data processing procedures, estimated errors, analysis procedures, and significant results to date. Thirteen severe turbulence cases are listed.
    Keywords: AIR TRANSPORTATION AND SAFETY
    Type: In: International Conference on Aviation Weather Systems, 4th, Paris, France, June 24-28, 1991, Preprints (A93-22101 07-47); p. 257-261.
    Format: text
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  • 6
    Publication Date: 2011-08-24
    Description: A need has arisen for efficient, blazed, symmetric gratings for use as beam splitters in far and extreme ultraviolet interferometers. In particular, the development of an all-reflection, far ultraviolet spatial heterodyne interferometer can benefit tremendously from such a grating. To fulfill this need, we have manufactured a mechanically ruled grating with a V-groove profile blazed for H Lyman-alpha at 1216 A. We present the grating performance at Lyman-alpha in the context of its application to the spatial heterodyne interferometer.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: In: EUV, X-ray, and gamma-ray instrumentation for astronomy II; Proceedings of the Meeting, San Diego, CA, July 24-26, 1991 (A93-34376 13-35); p. 313-318.
    Format: text
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  • 7
    Publication Date: 2011-08-24
    Keywords: AERODYNAMICS
    Type: Journal of Aircraft (ISSN 0021-8669); 29; 114-117
    Format: text
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  • 8
    Publication Date: 2011-08-24
    Keywords: GEOSCIENCES (GENERAL)
    Type: American Meteorological Society, Bulletin (ISSN 0003-0007); 72; 1683-170
    Format: text
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  • 9
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    In:  Other Sources
    Publication Date: 2011-08-19
    Description: The global linearization (inversion) of rigid-body rotational dynamics is reviewed, and representations in terms of quaternions and direction cosines are compared. Certain properties common to quaternions and direction cosines that make their use preferable to Euler angles and that simplify the inversion procedure are described. Applications of the inversion procedure for state estimation and attitude control are discussed. To avoid complexities caused by aerodynamics, an example of direct inversion for linear feedback control of spacecraft attitude is given.
    Keywords: CYBERNETICS
    Format: text
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  • 10
    Publication Date: 2013-08-29
    Description: The chance to integrate two emerging telecommunications technologies together, the Ku-band satellite communication (SATCOM) and cellular, offered the unique opportunity to package a truly stand-alone capability to reconstitute telecommuications service. Terrestrial cellular telephone services have proven to be an essential tool for dealing with local emergencies to the extent that they survive and remain operable, as in the San Francisco earthquake. Cellular telephones can provide emergency coordinators the flexibility of wireless mobility in the field via the Public Switched Network (PSN) to coordinate emergency services. However, not all areas are covered by cellular service; existing cellular and PSN service availability could be limited by the congestion and competition for the dial tone that occurs in emergencies. It was realized that a critical need exists for a rapidly deployable stand-alone cellular capability coupled with alternate connectivity to bypass congested or damaged PSN links. Existing commercial Ku-band satellite communications have provided alternate routing links in some cases to support emergency communications. An emergency operational capability was conceived that integrates these technologies into a rapidly deployable and transportable package that provides both local and long distance telephone services to an area that has suffered widespread telecommunications outages or has been totally isolated from the world.
    Keywords: COMMUNICATIONS AND RADAR
    Type: JPL, Proceedings of the Workshop on Advanced Network and Technology Concepts for Mobile, Micro, and Personal Communications; p 273-285
    Format: text
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