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  • 1
    Electronic Resource
    Electronic Resource
    Near Magnetic Field Investigation, Instrumentation, Spacecraft Magnetics and Data Access (1997)
    Springer
    Space science reviews 82 (1997), S. 255-281 
    Details
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The primary objective of the investigation is the search for a body-wide magnetic field of the near Earth asteroid Eros. The Near Earth Asteroid Rendezvous (NEAR) 3-axis fluxgate magnetometer includes a sensor mounted on the high-gain antenna feed structure. The NEAR Magnetic Facility Instrument (MFI) is a joint hardware effort between GSFC and APL. The design and magnetics approach achieved by the NEAR MFI effort entailed low-cost, up-front attention to engineering solutions which did not impact the schedule. The goal of the magnetometer is reliable magnetic field measurements within 5 nT, which necessitates the use of an extensive spacecraft magnetic interference model but is achievable with the full year's orbital data set. Such a goal has been shown viable with recent in-flight calibration data and comparisons to the WIND magnetometer data. The NEAR MFI effort has succeeded in providing magnetic field measurements for the first flight in NASA's Discovery line.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005089829882
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    Paper (German National Licenses)
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  • 2
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    Orbital results from gravity-gradient stabilized satellites (1966)
    In:  Other Sources
    Details
    Publication Date: 2011-08-11
    Description: Orbital results from satellites achieving passive gravity-gradient attitude stabilization
    Keywords: SPACE VEHICLES
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Magsat - A new satellite to survey the earth's magnetic field (1980)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The Magsat satellite was launched on Oct. 30, 1979 into a sun-synchronous dawn-dusk orbit, of 97 deg inclination, 350 km perigee, and 550 km apogee. It contains a precision vector magnetometer and a cesium-vapor scalar magnetometer at the end of a 6-m long graphite epoxy scissors boom. The magnetometers are accurate to 2 nanotesla. A pair of star cameras are used to define the body orientation to 10 arc sec rms. An 'attitude transfer system' measures the orientation of the magnetometer sensors relative to the star cameras to approximately 5 arc sec rms. The satellite position is determined to 70 meters rms by Doppler tracking. The overall objective is to determine each component of the earth's vector magnetic field to an accuracy of 6 nanotesla rms. The Magsat satellite gathers a complete picture of the earth's magnetic field every 12 hours. The vector components are sampled 16 times per second with a resolution of 0.5 nanotesla. The data will be used by the U.S. Geological Survey to prepare 1980 world magnetic field charts and to detect large-scale magnetic anomalies in the earth's crust for use in planning resource exploration strategy.
    Keywords: LAUNCH VEHICLES AND SPACE VEHICLES
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    The SAS-3 attitude control system (1975)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: SAS-3 uses a reaction wheel to provide torque to control the spin rate. If the wheel speed becomes too great or too small, it must be restored to its nominal rate by momentum dumping which is done by magnetic torquing against the earth's magnetic field by the satellite's magnetic coils. A small rate-integrating gyro is used to sense the spin rate so that closed loop control of the spin rate can be achieved. These various systems are described in detail including the reaction wheel system, the gyro system, along with control modes (spin rate control and the star lock mode).
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: APL Technical Digest; 14; July-Sep
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Magnetic attitude control system for HEAO Final report (1970)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Development of magnetic attitude control system for High Energy Astronomy Observatory satellite
    Keywords: NAVIGATION
    Type: NASA-CR-103025 , S2P-2-396
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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