Institute of Geodesy N Zehentner T MayerGrr Institute

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Institute of Geodesy N. Zehentner, T. Mayer-Gürr Institute of Geodesy, NAWI Graz University of

Institute of Geodesy N. Zehentner, T. Mayer-Gürr Institute of Geodesy, NAWI Graz University of Technology Norbert Zehentner Swarm DQW 2015, Paris 08. 09. 2015 1

Institute of Geodesy • High-low satellite-to-satellite tracking • GPSR measurements • Kinematic orbit •

Institute of Geodesy • High-low satellite-to-satellite tracking • GPSR measurements • Kinematic orbit • Gravity field Norbert Zehentner Swarm DQW 2015, Paris 08. 09. 2015 2

Institute of Geodesy Phase L 1 C/L 2 P Code C 1 P Code

Institute of Geodesy Phase L 1 C/L 2 P Code C 1 P Code C 2 P • Approach based on raw undifferenced observations (PPP) • Receiver antenna center variations Norbert Zehentner Swarm DQW 2015, Paris 08. 09. 2015 3

Institute of Geodesy SVN 44 SVN 55 • Approach based on raw undifferenced observations

Institute of Geodesy SVN 44 SVN 55 • Approach based on raw undifferenced observations (PPP) SVN 66 • Receiver antenna center variations • Transmitter antenna center variations Block IIR-A Block IIR-M Block IIF Norbert Zehentner Swarm DQW 2015, Paris 08. 09. 2015 4

Institute of Geodesy GRACE A Swarm A • Approach based on raw Phase L

Institute of Geodesy GRACE A Swarm A • Approach based on raw Phase L 1 C (PPP) Phase L 1 C undifferenced observations • Receiver antenna center variations • Transmitter antenna center variations • Accuracy map for observation weighting Norbert Zehentner Swarm DQW 2015, Paris 08. 09. 2015 5

Institute of Geodesy GRACE A Swarm A • Approach based. Code on raw C

Institute of Geodesy GRACE A Swarm A • Approach based. Code on raw C 1 P undifferenced observations Code C 1 P (PPP) • Receiver antenna center variations • Transmitter antenna center variations • Accuracy map for observation weighting Norbert Zehentner Swarm DQW 2015, Paris 08. 09. 2015 6

Institute of Geodesy Kinematic vs. reduced-dynamic Magnetic pole crossings Magnetic equator crossings 01. 08.

Institute of Geodesy Kinematic vs. reduced-dynamic Magnetic pole crossings Magnetic equator crossings 01. 08. 2014 Swarm A Norbert Zehentner Swarm DQW 2015, Paris 08. 09. 2015 7

Institute of Geodesy Swarm C daily rms values for 08. 2014 -06. 2015 Mean:

Institute of Geodesy Swarm C daily rms values for 08. 2014 -06. 2015 Mean: along: 7, 5 mm across: 6, 2 mm radial: 16, 2 mm Periods longer than 5 minutes removed Norbert Zehentner Swarm DQW 2015, Paris 08. 09. 2015 8

Institute of Geodesy • Analyzed observation residuals: Swarm C Norbert Zehentner Swarm DQW 2015,

Institute of Geodesy • Analyzed observation residuals: Swarm C Norbert Zehentner Swarm DQW 2015, Paris 08. 09. 2015 9

Institute of Geodesy • Analyzed observation residuals: Swarm C Norbert Zehentner Swarm DQW 2015,

Institute of Geodesy • Analyzed observation residuals: Swarm C Norbert Zehentner Swarm DQW 2015, Paris 08. 09. 2015 10

Institute of Geodesy • Short arc integral approach – Full 1 Hz sampling used

Institute of Geodesy • Short arc integral approach – Full 1 Hz sampling used – max D/O 60 • Individual monthly solutions for Alpha, Bravo and Charlie • Combined monthly solutions • Solution including all 18 available months • If. G orbits and ESA orbits used Norbert Zehentner Swarm DQW 2015, Paris 08. 09. 2015 11

Institute of Geodesy If. G Swarm Norbert Zehentner Swarm DQW 2015, Paris 08. 09.

Institute of Geodesy If. G Swarm Norbert Zehentner Swarm DQW 2015, Paris 08. 09. 2015 12

Institute of Geodesy Difference degree variances with respect to GOCO 05 s Norbert Zehentner

Institute of Geodesy Difference degree variances with respect to GOCO 05 s Norbert Zehentner Swarm DQW 2015, Paris 08. 09. 2015 13

Institute of Geodesy Difference degree variances with respect to GOCO 05 s Norbert Zehentner

Institute of Geodesy Difference degree variances with respect to GOCO 05 s Norbert Zehentner Swarm DQW 2015, Paris 08. 09. 2015 14

Institute of Geodesy Norbert Zehentner Swarm DQW 2015, Paris 08. 09. 2015 15

Institute of Geodesy Norbert Zehentner Swarm DQW 2015, Paris 08. 09. 2015 15

Institute of Geodesy Norbert Zehentner Swarm DQW 2015, Paris 08. 09. 2015 16

Institute of Geodesy Norbert Zehentner Swarm DQW 2015, Paris 08. 09. 2015 16

Institute of Geodesy Norbert Zehentner Swarm DQW 2015, Paris 08. 09. 2015 17

Institute of Geodesy Norbert Zehentner Swarm DQW 2015, Paris 08. 09. 2015 17

Institute of Geodesy ESA Swarm – GOCO 05 s (500 km Gaussian filter) Norbert

Institute of Geodesy ESA Swarm – GOCO 05 s (500 km Gaussian filter) Norbert Zehentner Swarm DQW 2015, Paris 08. 09. 2015 18

Institute of Geodesy If. G Swarm – GOCO 05 s (500 km Gaussian filter)

Institute of Geodesy If. G Swarm – GOCO 05 s (500 km Gaussian filter) Norbert Zehentner Swarm DQW 2015, Paris 08. 09. 2015 19

Institute of Geodesy If. G Swarm – GOCO 05 s (500 km Gaussian filter)

Institute of Geodesy If. G Swarm – GOCO 05 s (500 km Gaussian filter) Norbert Zehentner Swarm DQW 2015, Paris 08. 09. 2015 20

Institute of Geodesy Amazon River Basin GOCO 05 s reduced, 750 km Gaussian filter

Institute of Geodesy Amazon River Basin GOCO 05 s reduced, 750 km Gaussian filter applied Norbert Zehentner Swarm DQW 2015, Paris 08. 09. 2015 21

Institute of Geodesy • Melbourne-Wübbena combination Norbert Zehentner Swarm DQW 2015, Paris 08. 09.

Institute of Geodesy • Melbourne-Wübbena combination Norbert Zehentner Swarm DQW 2015, Paris 08. 09. 2015 22

Institute of Geodesy • Melbourne-Wübbena combination • Typical track of a satellite observed by

Institute of Geodesy • Melbourne-Wübbena combination • Typical track of a satellite observed by Jason 2 Norbert Zehentner Swarm DQW 2015, Paris 08. 09. 2015 23

Institute of Geodesy • Melbourne-Wübbena combination • Typical track of a satellite observed by

Institute of Geodesy • Melbourne-Wübbena combination • Typical track of a satellite observed by GOCE Norbert Zehentner Swarm DQW 2015, Paris 08. 09. 2015 24

Institute of Geodesy • Melbourne-Wübbena combination • Typical track of a satellite observed by

Institute of Geodesy • Melbourne-Wübbena combination • Typical track of a satellite observed by Swarm Norbert Zehentner Swarm DQW 2015, Paris 08. 09. 2015 25

Institute of Geodesy • Melbourne-Wübbena combination – Example: Swarm A • All observed tracks

Institute of Geodesy • Melbourne-Wübbena combination – Example: Swarm A • All observed tracks – mean value reduced Norbert Zehentner Swarm DQW 2015, Paris 08. 09. 2015 26

Institute of Geodesy • Melbourne-Wübbena combination • Zoom in common variation on all tracks

Institute of Geodesy • Melbourne-Wübbena combination • Zoom in common variation on all tracks • Possibly error in code observation • Reason? Norbert Zehentner Swarm DQW 2015, Paris 08. 09. 2015 27

Institute of Geodesy • Positive effect of changes made for Swarm C receiver •

Institute of Geodesy • Positive effect of changes made for Swarm C receiver • Systematics in GPSR observations – Related to ionosphere at magnetic poles and equator – Anomalous characteristics of Melbourne-Wübbena combination • High importance of covariance information for gravity field estimation • Large mass variations are seen in monthly gravity fields Norbert Zehentner Swarm DQW 2015, Paris 08. 09. 2015 28

Institute of Geodesy Orbits are available at: www. itsg. tugraz. at Thank you Funding

Institute of Geodesy Orbits are available at: www. itsg. tugraz. at Thank you Funding provided by the Austrian Research Promotion Agency (FFG) Norbert Zehentner Swarm DQW 2015, Paris 08. 09. 2015 29

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