Rapid and Precise Orbit Determination for the GOCE Satellite P. Visser, J. van den IJssel, T. van Helleputte, H. Bock, A. Jäggi, U. Meyer, G. Beutler,

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Rapid and Precise Orbit Determination for the GOCE Satellite P. Visser, J. van den IJssel, T. van Helleputte, H. Bock, A. Jäggi, U. Meyer, G. Beutler, M. Heinze, U. Hugentobler ESA Living Planet Symposium Bergen, Norway 28 June – 2 July 2010

Outline - Introduction - Instruments - Tracking performance - Orbit determination products - Quality

GOCE-HPF: Orbit groups Responsibilities: DEOS => RSO (Rapid Science Orbit) AIUB => PSO (Precise Science Orbit) IAPG => Validation

GOCE Orbit Determination - Support to operations (RSO): -Format checks (RINEX) -Check of quality of GPS observations -Check of gradiometer (common-mode) -Geo-location of gravity gradients -Pseudo observations for quick-look gravity field determination - Support to gravity field determination (PSO): -Final geo-location of gravity gradients -Pseudo observations for final gravity field determination - Spin-off (PSO): -Orbit prediction for ILRS

Instruments for POD: GPS and SLR NB: star trackers required for center-of-mass offset computation

GOCE GPS data: used for POD GPS receiver with 12 channels 1 Hz data hardly any data gaps

GOCE GPS Lagrange and MetOp GRAS Receiver performance ReceiverRMS phase (mm) Lagrange5.6/7.7 (Antex/No) GRAS7.5 (no Antex) NB: 30-sec GPS clocks

GPS BlackJack Receiver performance (CHAMP and GRACE) GPS BlackJack Receiver performance (CHAMP and GRACE) ReceiverRMS phase (mm) CHAMPno kin. GRACE-A5.0 (Antex) NB: 30-sec GPS clocks

Currently the % of zero L2 observations during the middle of a pass is small again NB: more than sufficient high-quality observations remaining! GOCE GPS data: zero L2 observations

Zero L2 observations during middle of a pass mostly occur at geomagnetic poles as well as on both sides of the geomagnetic equator GOCE GPS data : zero L2 observations Cont’d

GOCE SLR data: used for validation 5.4 passes and 95 normal points/day (31 March 2009 – 13 June 2010)

GOCE SLR data

Start HPF orbit predictions

Orbit solution Software GPS Observ. GPS products Sampling Data batches Latency RSO reduced- dynamic GEODYNtriple-diff IGS rapid 10 sec24 h1 day kinematicGHOSTzero-diff CODE rapid 1 sec24 h1 day PSO reduced- dynamic BERNESEzero-diff CODE final 10 sec30 h 7-10 days kinematicBERNESEzero-diff CODE final 1 sec30 h 7-10 days GOCE orbit generation Precision requirement: 50 cm Precision requirement: 2 cm Precision requirement: 2 cm

GOCE orbit products Rapid Science Orbit product (1-day latency): Reduced-dynamic orbit solution: SP3 file (position Hz) & Observation residuals Kinematic orbit solution: SP3 file 1 Hz) & Observation residuals Rotation matrices (J2000 ECF) Quality Report Precise Science Orbit product (1-2/4 weeks latency for interim/final): Reduced-dynamic orbit solution: SP3 file (position Hz) Observation residuals (interim only) Kinematic orbit solution: SP3 file 1 Hz) & variance/covariance matrix Observation residuals (interim only) Rotation matrices (J2000 ECF) Quality Report

RSO latency

Overview RSO performance Currently consistency between RSO and PSO is nominally below 1 dm

Spin-off RSO: common-mode vs. accelerations from reduced-dynamic POD (DFC off) Along-trackCross-track

Spin-off RSO: common-mode vs. accelerations from reduced-dynamic POD (DFC on) Along-trackCross-track

PSO: Comparison reduced-dynamic  kinematic orbits Consistency between reduced-dynamic and kinematic PSO is at 2 cm

Validation with SLR Orbit solutionMean [cm]RMS [cm] RSO reduced-dynamic kinematic PSO reduced-dynamic kinematic

Summary Lagrange GPS receiver is state-of-the-art space-borne dual-frequency receiver Decent amount of SLR tracking supported by HPF orbit predictions Latency and precision requirements are fulfilled: Low latency orbits (RSO): < 10 1-day delay Post-processed orbits (PSO): weeks delay

More details 1.Precise Science Orbits for the GOCE Satellite: Aiming at cm- Level Precision, Bock et al., Session GOCE: Level 2 data processing and products II, Tuesday, 29 June Room 3 2.GOCE Rapid Science Orbits: Achieving Sub-Dm Orbit Precision with Minimal Latency, van den IJssel et al., Poster Session – GOCE, Wednesday, 30 June 2010, 17:40-19:00