Star tracker derived rotations and accelerometer analysis Peter Schack, Anja Schlicht, Nadja Peterseim, Roland Pail, Thomas Gruber Institut für Astronomische.

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Presentation transcript:

Star tracker derived rotations and accelerometer analysis Peter Schack, Anja Schlicht, Nadja Peterseim, Roland Pail, Thomas Gruber Institut für Astronomische und Physikalische Geodäsie (IAPG), TU München Forschungseinrichtung Satellitengeodäsie (FESG), TU München Centre of Geodetic Earth System Research (CGE) SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December 2014

Level 1A Version 3 products: SW_OPER_STRASCI_1A_yyyymmddT235500_yyyymmddT000459_0301 SW_RPRO_STRASCI_1A_yyyymmddT235500_yyyymmddT000459_0301  Attitude of CHUs data record: MDR_STR_SCI  STR processed data record: MDR_STR_PRC Abbreviations: ICRF: Inertial Reference Frame CRF: Common Reference Frame MRF: Measurement Reference Frame SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December Star tracker data

SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December Star tracker derived rotations

SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December Star tracker derived rotations

SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December Star tracker derived rotations -STR processed data record: MDR_STR_PRC

SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December Star tracker derived rotations

SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December Star tracker derived rotations

SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December Star tracker derived rotations

SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December Star tracker derived rotations

SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December Accelerometer analysis Figure 2 ‑ 23: Radial acceleration of Swarm A. Left: S/C is in full sun. Right: S/C passes through the eclipse (indicated by grey background). (Swarm Accelerometer Anomaly Report)

SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December Accelerometer analysis

SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December Accelerometer analysis

SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December Accelerometer analysis

SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December Accelerometer analysis

SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December Accelerometer analysis Courtesy to Eelco Doornbos

SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December Accelerometer analysis

SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December Accelerometer analysis

SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December Accelerometer analysis

SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December Accelerometer analysis

SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December Accelerometer analysis

SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December Accelerometer analysis

SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December Accelerometer analysis a = amplitude  = width  = center (time) ζ = asymmetry factor a 2 = amplitude, depends on a s = scaling of damping d 1, d 2 = damping factors ω = ang. frequency b i = polynomial coefficents

SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December Accelerometer analysis heater torquer twangs

SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December Accelerometer analysis

SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December Accelerometer analysis Charging and discharging of satellite surfaces

STR: -STR processed data record: MDR_STR_PRC ICRF  CRF quaternions in overlapping time periods at beginning and end of a file do not contain identical values -Attitude of CHUs data record: MDR_STR_SCI Time tags are not ‘equidistant’ (sometimes 2 values in 1 second) -Star tracker derived angular accelerations are dominated by noise. Comparison to temperature reduced angular accelerations from VZLU on the basis of angular rates can be considered (after compensating STR temperature dependence) ACC: -High amplitude peaks seem to be comparable to GRACE twangs -With support from TU Delft it would be possible to correlate these peaks with solar impact on different satellite surfaces SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December Summary

SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December Thank you for your attention