Star tracker derived rotations and accelerometer analysis Peter

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Star tracker derived rotations and accelerometer analysis Peter Schack, Anja Schlicht, Nadja Peterseim, Roland

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

1 Star tracker data Level 1 A Version 3 products: • SW_OPER_STRASCI_1 A_yyyymmdd. T

1 Star tracker data Level 1 A Version 3 products: • SW_OPER_STRASCI_1 A_yyyymmdd. T 235500_yyyymmdd. T 000459_0301 • SW_RPRO_STRASCI_1 A_yyyymmdd. T 235500_yyyymmdd. T 000459_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 2014 2

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

2 Star tracker derived rotations SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December 2014 3

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

2 Star tracker derived rotations SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December 2014 4

2 Star tracker derived rotations - STR processed data record: MDR_STR_PRC SWARM Data Quality

2 Star tracker derived rotations - STR processed data record: MDR_STR_PRC SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December 2014 5

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

2 Star tracker derived rotations SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December 2014 6

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

2 Star tracker derived rotations SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December 2014 7

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

2 Star tracker derived rotations SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December 2014 8

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

2 Star tracker derived rotations SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December 2014 9

3 Accelerometer analysis Figure 2‑ 23: Radial acceleration of Swarm A. Left: S/C is

3 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 2014 10

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

3 Accelerometer analysis SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December 2014 11

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

3 Accelerometer analysis SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December 2014 12

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

3 Accelerometer analysis SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December 2014 13

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

3 Accelerometer analysis SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December 2014 14

3 Accelerometer analysis Courtesy to Eelco Doornbos SWARM Data Quality Workshop – Potsdam /

3 Accelerometer analysis Courtesy to Eelco Doornbos SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December 2014 15

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

3 Accelerometer analysis SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December 2014 16

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

3 Accelerometer analysis SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December 2014 17

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

3 Accelerometer analysis SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December 2014 18

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

3 Accelerometer analysis SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December 2014 19

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

3 Accelerometer analysis SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December 2014 20

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

3 Accelerometer analysis SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December 2014 21

3 Accelerometer analysis a = amplitude = width = center (time) ζ = asymmetry

3 Accelerometer analysis a = amplitude = width = center (time) ζ = asymmetry factor bi = polynomial coefficents a 2 = amplitude, depends on a s = scaling of damping d 1, d 2 = damping factors ω = ang. frequency SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December 2014 22

3 Accelerometer analysis heater torquer twangs SWARM Data Quality Workshop – Potsdam / Germany

3 Accelerometer analysis heater torquer twangs SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December 2014 23

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

3 Accelerometer analysis SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December 2014 24

3 Accelerometer analysis Charging and discharging of satellite surfaces SWARM Data Quality Workshop –

3 Accelerometer analysis Charging and discharging of satellite surfaces SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December 2014 25

4 Summary STR: - STR processed data record: MDR_STR_PRC ICRF quaternions in overlapping time

4 Summary STR: - STR processed data record: MDR_STR_PRC ICRF 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 2014 26

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

Thank you for your attention SWARM Data Quality Workshop – Potsdam / Germany 02. – 05. December 2014 27

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