Characteristics of the POD System in the new EPS GRAS Product Processing Facility

Transcription

1 Characteristics of the POD System in the new EPS Product Processing Facility Yoke Yoon, Yago Andres, Leonid Butenko, Elena Heredia, Alessandro Foresi, Christian Marquardt, Axel von Engeln 2 nd International Conference on GPS Radio Occultation (ICGPSRO) Taipei, TAIWAN May 14-16, 2013

2 Overview Introduction Product Processing Facility (-PPF) Current and future architecture Changes in Precise Orbit Determination system Estimation technique Maneouvre event handling Impact of future POD system in s Implementation status in EPS ground segment Slide: 2

3 Introduction Product Processing Facility (PPF) Objective Generate NRT Level1b (time-stamped and geolocated bending angles) s Method Processing of from (zenith and occultation antennas) using collection of software packages Components Pre-: Level-0 to Level-0r POD: Level-0r to EPS s/c orbit and clock s RO : Level-0r to Level-1a Level1b Slide: 3

4 A glimpse of -PPF functional components Current Level 0 to Level 1b processor Auxiliary Level 1b Level 1a Level 0 (SRIF) Tracking Data (Zenith) Orbit & Clocks RO Data (EUM & bufr) Slide: 4

5 A glimpse of -PPF functional components Current Level 0 to Level 1b processor Future Level 0 to Level 1b processor Auxiliary Auxiliary Level 1b Level 1a Level 0 (SRIF) Tracking Data (Zenith) Orbit & Clocks RO Data (EUM & bufr) Level 1b Level 1a Level 0 Obs (RINEX) (Batch) Orbit & Clock Wave Optics retrieval Level 0r RO (netcdf4) (netcdf4 & bufr) Slide: 5 Completed In progress Future work

6 A glimpse of -PPF functional components Current Level 0 to Level 1b processor Future Level 0 to Level 1b processor Auxiliary Auxiliary Level 1b Level 1a Level 0 (SRIF) Tracking Data (Zenith) Orbit & Clocks RO Data (EUM & bufr) Level 1b Level 1a Level 0 Obs (RINEX) (Batch) Orbit & Clock Wave Optics retrieval Level 0r RO (netcdf4) (netcdf4 & bufr) Slide: 6 Completed In progress Future work

7 A glimpse of -PPF functional components Current Level 0 to Level 1b processor Future Level 0 to Level 1b processor Auxiliary Auxiliary Level 1b Level 1a Level 0 (SRIF) Tracking Data (Zenith) Orbit & Clocks RO Data (EUM & bufr) Level 1b Level 1a Level 0 Obs (RINEX) (Batch) Orbit & Clock Wave Optics retrieval Level 0r RO (netcdf4) (netcdf4 & bufr) Slide: 7 Completed In progress Future work

8 A glimpse of -PPF functional components Current Level 0 to Level 1b processor Future Level 0 to Level 1b processor Auxiliary Auxiliary Level 1b Level 1a Level 0 (SRIF) Tracking Data (Zenith) Orbit & Clocks RO Data (EUM & bufr) Level 1b Level 1a Level 0 Obs (RINEX) (Batch) Orbit & Clock Wave Optics retrieval Level 0r RO (netcdf4) (netcdf4 & bufr) Slide: 8 Completed In progress Future work

9 Precise Orbit Determination System PDU 1 PDU = 3-mins package Data dump (1 orbital period) ~ PDUs Current POD system Maneouvre PDU Manual POD reset SRIF 1 sec Pseudorangebased Orbit Estimation Clock Estimation (pseudorange+phase) Slide: 9 3-hrs Orbit & Clock (include predicted)

10 Precise Orbit Determination System PDU 1 PDU = 3-mins package Data dump (1 orbital period) ~ PDUs Current POD system Maneouvre PDU After each POD reset Manual POD reset SRIF 1 sec Pseudorangebased Orbit Estimation - Orbit convergence takes 2-4 hours - Level 1b flagged Clock Estimation (pseudorange+phase) Slide: 10 3-hrs Orbit & Clock (include predicted)

11 Precise Orbit Determination System PDU 1 PDU = 3-mins package Data dump (1 orbital period) ~ PDUs Current POD system Future POD system Maneouvre PDU *5 PDU Previous PDUs Maneouvre Manual POD reset SRIF 1 sec Pseudorangebased Orbit Estimation Clock Estimation (pseudorange+phase) No calibration Auto-detect & skip Batch filter *16-hours Rinex obs *30 sec Orbit & Clock Estimation (pseudorange+phase) Slide: 11 3-hrs Orbit & Clock (include predicted) * indicates configurable parameter 16-hrs Orbit & Clock (5 mins prediction into future)

12 POD System Performance Orbit quality after POD reset (i.e. maneouvre event) SRIF (current) Batch (future) Slide: 12

13 POD System Performance Orbit quality after POD reset (i.e. maneouvre event) SRIF (current) Batch (future) Slide: 13 Within orbit accuracy requirement even when uses short arc (i.e. 15min, 30min,...)

14 POD System Performance Orbit quality after POD reset (i.e. maneouvre event) 28 September D Position (RMS) Current POD (cm) Future POD (cm) 30 mins arc hour arc hour arc Along-track velocity (RMS) Current POD (mm/s) Future POD (mm/s) 30 mins arc hour arc hour arc Slide: 14

15 POD System Performance Overall relative orbit accuracy (w.r.t. reference solution) Black line current POD (SRIF) Red line future POD (batch filter) Current POD Future POD 3D Position (RMS) Along-track velocity (RMS) 15.3 cm 5.05 cm mm/s mm/s Slide: 15

16 Development & Implementation Status Development status Level-0 to Level-0r construction NRT Precise Orbit Determination (batch filter) - Level 1a (in progress) - Level 1b ( and Wave ) Validation in EPS Ground Segment (GS) test environment (in progress) Level-0 to Level-0r construction performance (accuracy & timeliness) Slide: 16

17 Development & Implementation Status Development status Level-0 to Level-0r construction NRT Precise Orbit Determination (batch filter) - Level 1a (in progress) - Level 1b ( and Wave ) Validation in EPS Ground Segment (GS) test environment (in progress) Level-0 to Level-0r construction performance (accuracy & timeliness) What to look forward to in the coming months? New PPF (GO retrieval) go fully operational by end of 2013 Switched from GO to Wave method for operations within 1 st half of 2014 Slide: 17