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  • 1
    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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  • 2
    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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  • 3
    Publication Date: 2019-07-13
    Description: NASA Marshall Space Flight Center (MSFC) and The Johns Hopkins University Applied Physics Laboratory (APL) have been conducting mission studies and performing risk reduction activities for NASA s robotic lunar lander flight projects. This paper describes some of the lunar lander concepts derived from these studies conducted by the MSFC/APL Robotic Lunar Lander Development Project team. In addition, the results to date of the lunar lander development risk reduction efforts including high pressure propulsion system testing, structure and mechanism development and testing, long cycle time battery testing and combined GN&C and avionics testing will be addressed. The most visible elements of the risk reduction program are two autonomous lander flight test vehicles: a compressed air system with limited flight durations and a second version using hydrogen peroxide propellant to achieve significantly longer flight times and the ability to more fully exercise flight sensors and algorithms.
    Keywords: Cybernetics, Artificial Intelligence and Robotics
    Type: M10-0385 , M10-0698 , 7th International Planetary Probe Workshop (IPPW-7); Jun 12, 2010 - Jun 18, 2010; Barcelona; Spain
    Format: application/pdf
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