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Global Precipitation Measurement Mission Launch and CommissioningDuring launch and early operation of the Global Precipitation Measurement (GPM) Mission, the Guidance, Navigation and Control (GNC) analysis team encountered four main on orbit anomalies. These include: (1) unexpected shock from Solar Array deployment, (2) momentum buildup from the Magnetic Torquer Bars (MTBs) phasing errors, (3) transition into Safehold due to albedo-induced Course Sun Sensor (CSS) anomaly, and (4) a flight software error that could cause a Safehold transition due to a Star Tracker occultation. This paper will discuss ways GNC engineers identified and tracked down the root causes. Flight data and GNC on board models will be shown to illustrate how each of these anomalies were investigated and mitigated before causing any harm to the spacecraft. On May 29, 2014, GPM was handed over to the Mission Flight Operations Team after a successful commissioning period. Currently, GPM is operating nominally on orbit, collecting meaningful scientific data that will significantly improve our understanding of the Earth's climate and water cycle.
Document ID
20150008352
Acquisition Source
Goddard Space Flight Center
Document Type
Presentation
Authors
Davis, Nikesha (NASA Goddard Space Flight Center Greenbelt, MD United States)
Deweese, Keith (NASA Goddard Space Flight Center Greenbelt, MD United States)
Vess, Missie (NASA Goddard Space Flight Center Greenbelt, MD United States)
Welter, Gary (NASA Goddard Space Flight Center Greenbelt, MD United States)
O'Donnell, James R., Jr. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Date Acquired
May 19, 2015
Publication Date
January 30, 2015
Subject Category
Instrumentation And Photography
Geophysics
Meteorology And Climatology
Report/Patent Number
GSFC-E-DAA-TN20547
Report Number: GSFC-E-DAA-TN20547
Meeting Information
Meeting: AAS Guidance and Control Conference
Location: Breckenridge, CO
Country: United States
Start Date: January 30, 2015
End Date: February 4, 2015
Sponsors: American Astronautical Society
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Keywords
Guidance Navigation and Control
ACS
Attitude Control

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