EUM/OPS/VWG/11 Issue 1.0 22/06/2011 Yoke Yoon Yago Andres Christian Marquardt COSMIC GPS Data Processing Slide: 1.

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Presentation transcript:

EUM/OPS/VWG/11 Issue /06/2011 Yoke Yoon Yago Andres Christian Marquardt COSMIC GPS Data Processing Slide: 1

EUM/OPS/VWG/11 Issue /06/ Introduction Overview of Precise Orbit Determination (POD) activities COSMIC GPS data processing Status of GPS-based POD for COSMIC Preliminary results Future activities/goals Reprocessing of COSMIC data (2006-current) for whole constellation (POD and RO) Data reprocessing of other RO missions (CHAMP, GRACE, OceanSat-2) NRT operational POD for future Metop-B (2012), Metop-C (2016/2017) NRT offline POD for Jason-3

EUM/OPS/VWG/11 Issue /06/ Overview of GPS data processing activities (1/2) MetOp-A operational NRT Utilize NRT GPS orbit & clock products from GRAS Ground Support Network (operated by ESOC/ESA) Based on (batch) sequential estimation RO data processing MetOp-A offline POD Utilize Rapid GPS orbit & clock products from CODE Based on batch estimation

EUM/OPS/VWG/11 Issue /06/ Overview of GPS data processing activities (2/2) Jason-2 offline NRT POD Utilize NRT GRAS GSN products Batch estimation COSMIC GPS data processing Final (Precise) GPS products from CODE/AIUB (POD) Batch estimation RO data processing

EUM/OPS/VWG/11 Issue /06/ COSMIC GPS Data Processing GPS-based POD status Raw data assessment Investigate various processing options Orbit (internal & external) assessment Planned POD-related activities/analysis GPS RO (not yet started) Processing of GPS data from the RO antennas Derive bending angles and refractivity profiles Timeline of reprocessing activities COSMIC POD (from Level-0) commences after summer 2011 POD and RO product delivery to ECMWF by end of 2012 (GRAS, COSMIC, CHAMP, GRACE)

EUM/OPS/VWG/11 Issue /06/ COSMIC GPS Data Processing Nominal flight direction

EUM/OPS/VWG/11 Issue /06/ COSMIC GPS Data Processing Assessment of raw data GPS receiver tracking performance over time Easy identification of POD problems that arise from s/c tracking or data outages Planned to be included in the operational processing facility as part of the monitoring system for future missions COSMIC FM 6

EUM/OPS/VWG/11 Issue /06/ COSMIC GPS Data Processing Assessment of raw data COSMIC FM 6 (IGOR) MetOp-A (GRAS)

EUM/OPS/VWG/11 Issue /06/ COSMIC GPS Data Processing POD processing strategy Use of quaternion for s/c orientation knowledge GPS phase and pseudorange observations sampled at 1 min (no smoothing) Precise GPS orbit and (30s) clock product from CODE/AUIB Parameter settings in NAPEOS gear more toward s/c modelled dynamics  weight on phase data,  = 3 cm  weight on pseudorange,  = 6 m 30-hr arc (6-hr overlap between consecutive arcs) 7 consecutive days of COSMIC FM#6 GPS observation data ( 26 Nov – 2 Dec 2008 )

EUM/OPS/VWG/11 Issue /06/ COSMIC GPS Data Processing Parameter estimates COSMIC state vector (position & velocity) and clock offset Step-wise constant drag coefficient (12/arc) SRP coefficient (1/arc) 1/rev sine and cosine along- and cross-track empirical accelerations (1/arc) Carrier phase bias (per pass)

EUM/OPS/VWG/11 Issue /06/ COSMIC GPS Data Processing Dynamic Models Gravity field modelEIGEN-GL04C (100 x 100) 3 rd body perturbationJPL DE405 ephemerides Solid Earth, Pole & Ocean tidesApplied Relativistic correction & driftApplied IR & Albedo radiationApplied Atmospheric density & SRPConstant area Measurement models IonosphereLinear combination Phase wind-upApplied Antenna phase center corrections (offset & variation) Nominal values applied Corrections applied

EUM/OPS/VWG/11 Issue /06/ COSMIC GPS Data Processing External orbit product for comparison UCAR (website) 27-hr arc (Day 1 00:00:00 – Day 2 03:00:00) JPL (special request) 30-hr arc (Day 0 21:00:00 – Day 2 03:00:00) Orbit overlap assessment Shows the median of 6 sets of overlap (RMS) statistics Position (cm)Velocity (mm/s) # pts (per set) RTN3DRTN EUMETSAT JPL UCAR

EUM/OPS/VWG/11 Issue /06/ COSMIC GPS Data Processing External orbit product for comparison UCAR (website) 27-hr arc (Day 1 00:00:00 – Day 2 03:00:00) JPL (special request) 30-hr arc (Day 0 21:00:00 – Day 2 03:00:00) Orbit overlap assessment Shows the median of 6 sets of overlap (RMS) statistics Position (cm)Velocity (mm/s) # pts (per set) RTN3DRTN EUMETSAT JPL UCAR

EUM/OPS/VWG/11 Issue /06/ COSMIC GPS Data Processing Inter-comparison time period EUM vs JPL (24-hrs) 00:00: :00:00 EUM vs UCAR (23-hrs) 01:00:00 – 24:00:00 UCAR vs JPL (23-hrs) Shows the median of 7 sets of daily RMS statistics Position (cm)Velocity (mm/s) # pts (per set) RTN3DRTN EUM-JPL EUM-UCAR UCAR-JPL

EUM/OPS/VWG/11 Issue /06/ COSMIC GPS Data Processing Planned activities Smoothing of the quaternion Quaternion derived from magnetometer, Earth (highest weight) & Sun sensors

EUM/OPS/VWG/11 Issue /06/ COSMIC GPS Data Processing s/c orientation (Euler angles) COSMIC s/c tumbles constantly as it does not maintain a 3-axis stable attitude

EUM/OPS/VWG/11 Issue /06/ COSMIC GPS Data Processing Planned activities Smoothing of the quaternion Simultaneous processing of GPS data from two antennas (same s/c) (JPL COSMIC POD is based on this) POD antenna #1 from COSMIC FM 6 POD antenna #2 from COSMIC FM 6 flight direction

EUM/OPS/VWG/11 Issue /06/ COSMIC GPS Data Processing Preliminary assessment (overlap of DOY of 2008) of FM2 Position (cm) RMSVelocity (mm/s) RMS # pts RTN3DRTN EUM (1 Ant) EUM (2 Ant) JPL UCAR

EUM/OPS/VWG/11 Issue /06/ COSMIC GPS Data Processing External assessment (average of DOY 332 & 333 of 2008) of FM2 Position (cm) RMSVelocity (mm/s) RMS RTN3DRTN EUM-JPL (1 Ant) EUM-JPL (2 Ant) EUM-UCAR (1 Ant) UCAR-JPL

EUM/OPS/VWG/11 Issue /06/ COSMIC GPS Data Processing External assessment (average of DOY 332 & 333 of 2008) of FM2 Position (cm) RMSVelocity (mm/s) RMS RTN3DRTN EUM-JPL (1 Ant) EUM-JPL (2 Ant) EUM-UCAR (1 Ant) UCAR-JPL Position along-track bias (cm) EUM (1 Ant) vs JPL EUM (1 Ant) vs UCAR UCAR vs JPL DOY

EUM/OPS/VWG/11 Issue /06/ COSMIC GPS Data Processing External assessment (average of DOY 332 & 333 of 2008) of FM2 Position (cm) RMSVelocity (mm/s) RMS RTN3DRTN EUM-JPL (1 Ant) EUM-JPL (2 Ant) EUM-UCAR (1 Ant) UCAR-JPL Position along-track bias (cm) EUM (1 Ant) vs JPL EUM (2 Ant) vs JPL EUM (1 Ant) vs UCAR EUM (2 Ant) vs UCAR UCAR vs JPL DOY

EUM/OPS/VWG/11 Issue /06/ COSMIC GPS Data Processing Planned activities Smoothing of the quaternion Simultaneous processing of GPS data from two antennas Analyze the existence of an along-track bias in inter-agency orbit comparison POD parameter tuning (i.e. drag coefficient)

EUM/OPS/VWG/11 Issue /06/ COSMIC GPS Data Processing Planned activities Smoothing of the quaternion Simultaneous processing of GPS data from two antennas (from same s/c) Analyze the existence of an along-track bias in inter-agency orbit comparison Automate reprocessing of 5-6 years of data for 6 s/c

EUM/OPS/VWG/11 Issue /06/ COSMIC GPS Data Processing Planned activities Smoothing of the quaternion Simultaneous processing of GPS data from two antennas (from same s/c) Analyze the existence of an along-track bias in inter-agency orbit comparison Automate reprocessing of 5-6 years of data for 6 s/c Processing of COSMIC RO data to derive bending angle & refractivity profiles

EUM/OPS/VWG/11 Issue /06/ COSMIC GPS Data Processing Planned activities Smoothing of the quaternion Simultaneous processing of GPS data from two antennas (from same s/c) Analyze the existence of an along-track bias in inter-agency orbit comparison Automate reprocessing of 5-6 years of data for 6 s/c Processing of COSMIC RO data to derive bending angle & refractivity profiles Challenges in automating COSMIC POD Handling of large data gaps (especially at the beginning of the mission) Handling of maneuvers FM2 and FM5 had attitude control & receiver anomalies in 2007

EUM/OPS/VWG/11 Issue /06/2011 End of Presentation Questions?