A Jitter-Mitigating High Gain Antenna Pointing Algorithm for the Solar Dynamics ObservatoryThis paper details a High Gain Antenna (HGA) pointing algorithm which mitigates jitter during the motion of the antennas on the Solar Dynamics Observatory (SDO) spacecraft. SDO has two HGAs which point towards the Earth and send data to a ground station at a high rate. These antennas are required to track the ground station during the spacecraft Inertial and Science modes, which include periods of inertial Sunpointing as well as calibration slews. The HGAs also experience handoff seasons, where the antennas trade off between pointing at the ground station and pointing away from the Earth. The science instruments on SDO require fine Sun pointing and have a very low jitter tolerance. Analysis showed that the nominal tracking and slewing motions of the antennas cause enough jitter to exceed the HGA portion of the jitter budget. The HGA pointing control algorithm was expanded from its original form as a means to mitigate the jitter.
Bourkland, Kristin L. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Liu, Kuo-Chia (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Blaurock, Carl (Nightsky Systems Raleigh, NC, United States)
August 24, 2013
September 24, 2007
Publication: Proceedings of the 20th International Symposium on Space Flight Dynamics