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  • Spacecraft Instrumentation and Astrionics  (2)
  • Computer Programming and Software  (1)
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  • 1
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    Restoring Redundancy to the MAP Propulsion System (2002)
    In:  CASI
    Details
    Publication Date: 2019-07-27
    Description: The Microwave Anisotropy Probe (MAP) is a follow-on to the Differential Microwave Radiometer (DMR) instrument on the Cosmic Background Explorer (COBE). Due to the MAP project's limited mass, power, and financial resources, a traditional reliability concept including fully redundant components was not feasible. The MAP design employs selective hardware redundancy, along with backup software modes and algorithms, to improve the odds of mission success. In particular, MAP's propulsion system, which is used for orbit maneuvers and momentum management, uses eight thrusters positioned and oriented in such a way that its thruster-based attitude control modes can maintain three-axis attitude control in the event of the failure of any one thruster.
    Keywords: Spacecraft Instrumentation and Astrionics
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    An Anomalous External Force on the MAP Spacecraft (2002)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A common theme in discussions of the Microwave Anisotropy Probe (MAP) is the attainment of mission goals for minimal cost. One area of cost savings was a reduction in the fuel budget required. To reach orbit around the L2 notation point of the Earth-Sun system, the MAP spacecraft was guided very close to the Moon, allowing a gravity-assisted trajectory out to L2. In order to property time the lunar swing-by, MAP followed a trajectory of three-and-a-half highly elliptical phasing loops. At each perigee of this trajectory MAP executed a thruster maneuver to increase orbit velocity; maneuvers were required at one or both clothe first two perigees (called P1 and P2) and at the third and final perigee (P-final). The preference was for successful maneuvers at all three perigees because this scheme provided a small, additional fuel savings.
    Keywords: Spacecraft Instrumentation and Astrionics
    Type: AIAA Guidance and Control Conference; Aug 01, 2002; Monterey, CA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Use of the MATRIXx Integrated Toolkit on the Microwave Anisotropy Probe Attitude Control System (1999)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Recent advances in analytical software tools allow the analysis, simulation, flight code, and documentation of an algorithm to be generated from a single source, all within one integrated analytical design package. NASA's Microwave Anisotropy Probe project has used one such package, Integrated Systems' MATRIXx suite, in the design of the spacecraft's Attitude Control System. The project's experience with the linear analysis, simulation, code generation, and documentation tools will be presented and compared with more traditional development tools. In particular, the quality of the flight software generated will be examined in detail. Finally, lessons learned on each of the tools will be shared.
    Keywords: Computer Programming and Software
    Type: AAS-99-063 , GN and C; Feb 03, 1999 - Feb 07, 1999; Breckenridge, CO; United States
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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