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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)
    Fulltext
  • 2
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    Unknown
    Experience with custom processors in space flight applications (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The Applied Physics Laboratory (APL) has developed a magnetometer instrument for a swedish satellite named Freja with launch scheduled for August 1992 on a Chinese Long March rocket. The magnetometer controller utilized a custom microprocessor designed at APL with the Genesil silicon compiler. The processor evolved from our experience with an older bit-slice design and two prior single chip efforts. The architecture of our microprocessor greatly lowered software development costs because it was optimized to provide an interactive and extensible programming environment hosted by the target hardware. Radiation tolerance of the microprocessor was also tested and was adequate for Freja's mission -- 20 kRad(Si) total dose and very infrequent latch-up and single event upset events.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: Idaho Univ., The 1991 3rd NASA Symposium on VLSI Design; 13 p
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    An innovative on-board processor for lightsats (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The Applied Physics Laboratory (APL) has developed a flightworthy custom microprocessor that increases capability and reduces development costs of lightsat science instruments. This device, called the FRISC (FORTH Reduced Instruction Set Computer), directly executes the high-level language called FORTH, which is ideally suited to the multitasking control and data processing environment of a spaceborne instrument processor. The FRISC will be flown as the onboard processor in the Magnetic Field Experiment on the Freja satllite. APL has achieved a significant increase in onboard processing capability with no increase in cost when compared to the magnetometer instrument on Freja's predecessor, the Viking satellite.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: Annual AIAA/Utah State University Conference on Small Satellites; Aug 27, 1990 - Aug 30, 1990; Logan, UT; United States
    Format: text
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    NASA TECHNICAL REPORTS
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