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The Maneuver Planning Process for the Microwave Anisotropy Probe (MAP) MissionThe Microwave Anisotropy Probe (MAP) was successfully launched from Kennedy Space Center's Eastern Range on June 30, 2001. MAP will measure the cosmic microwave background as a follow up to NASA's Cosmic Background Explorer (COBE) mission from the early 1990's. MAP will take advantage of its mission orbit about the Sun-Earth/Moon L2 Lagrangian point to produce results with higher resolution, sensitivity, and accuracy than COBE. A strategy comprising highly eccentric phasing loops with a lunar gravity assist was utilized to provide a zero-cost insertion into a lissajous orbit about L2. Maneuvers were executed at the phasing loop perigees to correct for launch vehicle errors and to target the lunar gravity assist so that a suitable orbit at L2 was achieved. This paper will discuss the maneuver planning process for designing, verifying, and executing MAP's maneuvers. A discussion of the tools and how they interacted will also be included. The maneuver planning process was iterative and crossed several disciplines, including trajectory design, attitude control, propulsion, power, thermal, communications, and ground planning. Several commercial, off-the-shelf (COTS) packages were used to design the maneuvers. STK/Astrogator was used as the trajectory design tool. All maneuvers were designed in Astrogator to ensure that the Moon was met at the correct time and orientation to provide the energy needed to achieve an orbit about L2. The Mathworks Matlab product was used to develop a tool for generating command quaternions. The command quaternion table (CQT) was used to drive the attitude during the perigee maneuvers. The MatrixX toolset, originally written by Integrated Systems, Inc., now distributed by Mathworks, was used to create HiFi, a high fidelity simulator of the MAP attitude control system. HiFi was used to test the CQT and to make sure that all attitude requirements were met during the maneuver. In addition, all ACS data plotting and output were generated in MatrixX. A final test used FlatSat, a real-time hardware-in-the-loop simulator, which used identical MAP flight code to simulate operations on the spacecraft. Simulations in FlatSat allowed the MAP team to verify maneuver commands, timing, and spacecraft configuration before the commands were sent up to the spacecraft for execution. The MAP maneuver team successfully pieced together all of these COTS tools for designing MAP's maneuvers and MAP is now collecting data at L2.
Document ID
20020067729
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Mesarch, Michael A.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Andrews, Stephen
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Bauer, Frank
Date Acquired
August 20, 2013
Publication Date
January 1, 2002
Subject Category
Spacecraft Design, Testing And Performance
Meeting Information
Meeting: AIAA/AAS Astrodynamics Specialist Conference
Location: Monterey, CA
Country: United States
Start Date: August 5, 2002
End Date: August 8, 2002
Sponsors: American Inst. of Aeronautics and Astronautics, American Astronautical Society
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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