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The map propulsion subsystem
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Davis, Gary T. |
| Copyright Year | 2002 |
| Description | This paper describes the requirements, design, integration, test, performance, and lessons learned of NASA's Microwave Anisotropy Probe (MAP) propulsion subsystem. MAP was launched on a Delta-II launch vehicle from NASA's Kennedy Space Center on June 30, 2001. Due to instrument thermal stability requirements, the Earth-Sun L2 Lagrange point was selected for the mission orbit. The L2 trajectory incorporated phasing loops and a lunar gravity assist. The propulsion subsystem's requirements are to manage momentum, perform maneuvers during the phasing loops to set up the lunar swingby, and perform stationkeeping at L2 for 2 years. MAP's propulsion subsystem uses 8 thrusters which are located and oriented to provide attitude control and momentum management about all axes, and delta-V in any direction without exposing the instrument to the sun. The propellant tank holds 72 kg of hydrazine, which is expelled by unregulated blowdown pressurization. Thermal management is complex because no heater cycling is allowed at L2. Several technical challenges presented themselves during I and T, such as in-situ weld repairs and in-situ bending of thruster tubes to accommodate late changes in the observatory CG. On-orbit performance has been nominal, and all phasing loop, mid-course correction, and stationkeeping maneuvers have been successfully performed to date. |
| File Size | 826015 |
| Page Count | 10 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20020085382 |
| Archival Resource Key | ark:/13960/t6tx88s96 |
| Language | English |
| Publisher Date | 2002-04-01 |
| Access Restriction | Open |
| Subject Keyword | Spacecraft Propulsion And Power Hydrazines Performance Tests Attitude Control Design Analysis Propellant Tanks Microwave Probes Chemical Propulsion Spacecraft Propulsion Delta Launch Vehicle Spacecraft Trajectories Stationkeeping Spacecraft Control Sky Surveys Astronomy Temperature Control Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
