GRAS SAG 26, EUMETSAT 22 nd, 23 rd of June 2011 Level 1B Operational Processing GRAS Team at EUMETSAT.

Slides:



Advertisements
Similar presentations
Status of the CTP O.Villalobos Baillie University of Birmingham April 23rd 2009.
Advertisements

SVN-49 Signal Anomaly Presented by Tom Stansell GPSW POC: Lt. Col. James Lake, Ph.D.
GOME-2 FM3 (Metop-A) Instrument Review, EUMETSAT, Darmstadt, June 2012 Slide: 1 Rűdiger Lang, Rose Munro, Antoine Lacan, Richard Dyer, Marcel Dobber, Christian.
May 2004Iridium Users Workshop, Seattle National Data Buoy Center’s Experiences with Real-Time Data Retrieval from Remote Stations using Iridium; and Data.
Two-Gyro Performance: Scheduling and Acquisitions Merle Reinhart.
Excess phase computation S. Casotto, A. Nardo, P. Zoccarato, M. Bardella CISAS, University of Padova.
RF de-bunching problem  The Beam Phase module measures the phase of each individual bunch and makes an average that is passed to the Low Level for updating.
A SINGLE FREQUENCY GPS SOFTWARE RECEIVER
1 Virgo Commissioning progress and plans ILIAS, Jan 23 rd 2007 Matteo Barsuglia on behalf of the Commissioning Team.
An offline look at TIF data David Stuart UC Santa Barbara May 2, 2007.
Per R. Bodin Global Posision System GPS. Per R. Bodin Litt historie 1960: nasA & DoD are Interested in developing a satellite based position system with.
Status GRACE Mission Operations 1 GSTM – Potsdam - 15 October 2007 Status GRACE Mission Operations Joseph G. Beerer, JPL Operations Mission Manager Franz-Heinrich.
New Satellite Capabilities and Existing Opportunities Bill Kuo 1 and Chris Velden 2 1 National Center for Atmospheric Research 2 University of Wisconsin.
GNSS Receiver - Software Radio Concept František Vejražka Czech Technical University in Prague Faculty of Electrical Engineering.
LMD/IPSL 1 Ahmedabad Megha-Tropique Meeting October 2005 Combination of MSG and TRMM for precipitation estimation over Africa (AMMA project experience)
Van Allen Probes Spacecraft Operations July 29, 2015 Kristin Fretz
UPS network perturbations in SX2 Vincent Chareyre EN-EL-SN ALICE Technical Coordination Meeting 7 May 2010.
Modern Navigation Thomas Herring MW 11:00-12:30 Room A
Different options for the assimilation of GPS Radio Occultation data within GSI Lidia Cucurull NOAA/NWS/NCEP/EMC GSI workshop, Boulder CO, 28 June 2011.
Ground Support Network operations for the GRAS Radio Occultation Mission R. Zandbergen, the GRAS GSN team (ESOC) and the Metop GRAS team (EUMETSAT) 09/09/2011.
10/7/ Innovative Solutions International Satellite Navigation Division ION NTM 01 Capabilities of the WAAS and EGNOS For Time Transfer SBAS, an Alternate.
On Improving GFS Forecast Skills in the Southern Hemisphere: Ideas and Preliminary Results Fanglin Yang Andrew Collard, Russ Treadon, John Derber NCEP-EMC.
25 June 2009 Dawn Conway, AMSR-E TLSCF Lead Software Engineer AMSR-E Team Leader Science Computing Facility.
ESOC Navigation Support Office EGU Vienna, , 1/18 Ground support network for the Metop GRAS atmospheric sounding mission R.Zandbergen, A.Ballereau,
Validation workshop, Frascati, 13 December 2002Page 1 SCIAMACHY products quality and recommendations Based on presentations and discussions during this.
OSTST Hobart 2007 – Performance assessment Jason-1 data M.Ablain, S.Philipps, J.Dorandeu, - CLS N.Picot - CNES Jason-1 GDR data Performance assessment.
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,
GSI Japan - 21st of June 1999 GPS-Positioning using Virtual Reference Stations - Theory, Analysis and Applications Herbert Landau Spectra Precision Terrasat.
Timing Augmented GPS Update Eddie Byrne, Symmetricom January 23, 2008.
GIST th -16 th Dec B.Stewart RAL Mirror Anomaly Review Board Update.
Monday h00: End of fill #1640: 3.7 pb h14: RB S12 and S23 tripped before loading rampdown table, active filter. MPE piquet. Fip_Com_Lost.
Slide 1 Second GPS/RO Users Workshop, August , The EUMETSAT Polar System GRAS SAF and Data Products Martin B. Sorensen GRAS SAF Project Atmosphere.
GIST 19: GGSPS status Status of GGSPS development and operations Andy Smith GGSPS software project manager.
Fast Fault Finder A Machine Protection Component.
GRAS SAF User Workshop June GRAS Level 1 Processing and Products Juha-Pekka Luntama and Julian Wilson EUMETSAT Am Kavalleriesand 31, D
Archived Data Management System Study Advisory Committee Meeting May 14, 2003.
ROSA GRAS Meeting February 2009 Matera, Italy GRAS Monitoring and Validation GRAS EUMETSAT (contact:
Key RO Advances Observation –Lower tropospheric penetration (open loop / demodulation) –Larger number of profiles (rising & setting) –Detailed precision.
Level 1.5 Geolocation Martin Bates, RAL GIST th December, 2005.
EUM/OPS/VWG/11 Issue /06/2011 Yoke Yoon Yago Andres Christian Marquardt COSMIC GPS Data Processing Slide: 1.
CERN, 18 december 2003Coincidence Matrix ASIC PRR Coincidence ASIC modifications E.Petrolo, R.Vari, S.Veneziano INFN-Rome.
Deep Occultations With GRAS C. Marquardt, A.von Engeln and Y. Andres.
18 th GIST Meeting 14 th –16 th May 2003 Ground Segment (GGSPS) Report 1 GERB Ground Segment B.C.Stewart RAL.
Improved Radio Occultation Observations for a COSMIC Follow-on Mission C. Rocken, S. Sokolovskiy, B. Schreiner UCAR / COSMIC D. Ector NOAA.
ASI, February 2009 The GRAS Instrument C. Marquardt, Y. Andres, A. von Engeln, F. Sancho.
Principles of the Global Positioning System Lecture 09 Prof. Thomas Herring Room A;
Ozone PEATE 2/20/20161 OMPS LP Release 2 - Status Matt DeLand (for the PEATE team) SSAI 5 December 2013.
GIST-21 Meeting 31 March-02 April MSG PROGRAMME STATUS Presentation to the GIST-21 meeting.
1 EMCAL Reconstruction in Pass pp 900 GeV 29/03/2010 Gustavo Conesa Balbastre.
COSMIC: Constellation Observing System for Meteorology, Ionosphere and Climate Mission Status and Results UCAR COSMIC Project FORMOSAT-3.
Update on B-analysis Introduction Towards a definition of a limited set of plots for TDR, using all available data. Based on few general.
Jason-1 POD reprocessing at CNES Current status and further developments L. Cerri, S. Houry, P. Perrachon, F. Mercier. J.P. Berthias with entries from.
GIST-19 Meeting August MSG-1 - PROGRAMME STATUS Presentation to the GIST-19 meeting.
Astronomical Institute University of Bern Astronomical Institute, University of Bern Swarm Gravity Field Results with the CMA Adrian Jäggi, Daniel Arnold,
Astronomical Institute University of Bern 1 Astronomical Institute, University of Bern, Switzerland 2 German Research Centre for Geosciences, Potsdam,
Design of the 64-channel ASIC: update DEI - Politecnico di Bari and INFN - Sezione di Bari Meeting INSIDE, December 18, 2014, Roma Outline  Proposed solution.
CGMS-43-ISRO-WP-03, version-1, CGMS WGIII May 2015 Coordination Group for Meteorological Satellites - CGMS ROSA Data Processing at ISRO Presented.
IMPACTS OF THE DECEMBER 2006 SOLAR RADIO BURSTS ON GPS OPERATIONS AMS Fifth Symposium on Space Weather New Orleans, LA January 20-21, 2008 Dr. Charles.
AXK/JPL SBAS Training at Stanford University, October 27-30, 2003 Satellite Based Augmentation Systems Brazilian Ionosphere Group Training at Stanford.
COSMIC: Constellation Observing System for Meteorology, Ionosphere and Climate Mission Status and Results UCAR COSMIC Project FORMOSAT-3.
WEC meeting TED status and WEC timing.
Astronomical Institute University of Bern 1 Astronomical Institute, University of Bern, Switzerland * now at PosiTim, Germany 5th International GOCE User.
GOMOS Mission and Processing Status On 22nd March 2003 GOMOS suffered the anomaly ‘Azimuth Voice coil command saturation”. The anomaly occurred during.
ACC/GPSR Splinter Summary
Concept study GOME-2/AVHRR radiance inter-comparison
Understanding what sh_gamit does
COSMIC Data Analysis and Archival Center
Low Level RF Status Outline LLRF controls system overview
Challenges of Radio Occultation Data Processing
Open Loop Tracking of GPS Radio Occultation for LEOs
Presentation transcript:

GRAS SAG 26, EUMETSAT 22 nd, 23 rd of June 2011 Level 1B Operational Processing GRAS Team at EUMETSAT

GRAS SAG 26, EUMETSAT 22 nd, 23 rd of June 2011 Slide: 2 Operational Processing: Setup / Events PPF 2.16 running since July 2010 tracking down to -250km SLTA from Oct 2010 onwards overlap configuration changed, thus no more double occultations now observed ADA now operational (not all orbits) Orbits affected by geomagnetic storms (often avoided POD reset by context transfer) First ever Metop collision avoidance maneuver on 1 st of May 2011 PPF 2.17 under development since Dec 2010, running on GS2: fixing zeros in some 2.16 output fields azimuth angle at tangent point included in output fields some other orbit, data stuff L2 extrapolation optional (updates / improvements under investigation, see later presentations) with new configuration (should improve mitigation of solar storms) planned for GS1 next week Instrument software update to 1.9 on 5 th of May (wrong ephemeris usage) Instrument software update to 1.10 ~2 months until delivery (tracking improvement)

GRAS SAG 26, EUMETSAT 22 nd, 23 rd of June 2011 Slide: 3 Operational Processing: # of Occultations GRAS shows very solid performance, very few instrument issues detected and potential software updates are evaluated. GRAS PPF 2.16 (no QC) and COSMIC provided number of occultations / day over last year Manoeuvre S/W Update

GRAS SAG 26, EUMETSAT 22 nd, 23 rd of June 2011 Slide: 4 Operational Processing: Issues Current processor issues: no raw sampling / open loop and wave optics processing orbit affected by data flow interruptions, magnetic storms, etc. This leads to degraded data for several hours, often requiring manual intervention.

GRAS SAG 26, EUMETSAT 22 nd, 23 rd of June 2011 Slide: 5 Operational Processing: Antarctic Dump ADA Station: additional Antarctica download station (operational service started June 2011, all orbits in 2014)

Slide: 6 OPS Quarterly Meeting 10 June 2010– Andrew Monham MetOp-A Status DHSA: Redundant CCU I/O Board. Further investigation of I/O Board planned following a possible future PLSOL outage. HRPT:B unit in restricted operation. Complete longitudinal coverage zone active since 18th January (No transmission at higher latitudes in both hemispheres) AMSU A1: Channel 7 is declared failed MHS channel degradations – now on highest possible gain – products may be impacted starting in A-DCS: frequency complaints - no requests to stop operations. GOME throughput loss investigation – ongoing.

GRAS SAG Meeting 26, Darmstadt 22 nd June 2011 Detailed view on GRAS / Processing Anomalies Slide: 7

GRAS SAG Meeting 26, Darmstadt 22 nd June POD resets (compared to 21 from July 2009 to June 2010) Missing L0 data (CDA, PGF, GS...) 4(9) Manoeuvres4(2) GSN1(2) Instrument 8 USO clock slip 5(2) Unphysical Pseudo-ranges1(1) Divergence of navigation solution0(1) SLTA change 1*(2) Upload of software version 1(1) Unknown ancillary packet type 8 1(0) Every reset: 4hours of products flagged as degraded Solar Storms (along track biases) ~4 degraded periods Slide: 8 Operational POD between July 2010-June 2011 * SLTA change done during OOP Manoeuvre (Oct 2010)

GRAS SAG Meeting 26, Darmstadt 22 nd June 2011 Instrument – Phase Slips PLL All but one are very close to a multiple of 200ns (most are 400 ns) corresponding to 5Mhz USO frequency Triggers reset on operational POD No impact on batch prototype Slide: 9 ~400 ns ~560ns

GRAS SAG Meeting 26, Darmstadt 22 nd June 2011 Slide: 10 Instrument – Phase Slips PLL ~400 ns Plots show the POD clock bias estimation of GRAS, removing a one degree polynomial

GRAS SAG Meeting 26, Darmstadt 22 nd June 2011 Slide: 11 Instrument – Phase Slips PLL ~200ns ~800ns Plots above and below show PLL phase slip as observed in the Level0 data

GRAS SAG Meeting 26, Darmstadt 22 nd June 2011 Degradation due to misbehaviour of sequential estimator during solar storms Slide: 12 Strongest event, beginning of March2011. Until this point temporary solution was to move a converged state from G2 to G1 Decided to try different history fading times configuration

GRAS SAG Meeting 26, Darmstadt 22 nd June 2011 Slide: 13 Degradation due to misbehaviour of sequential estimator during solar storms Finally reduce fading time from ~30 orbits to ~5 orbits Small increase of noise during quite periods; no along track biases during storms Currently being tested in g2, and will soon go operational

GRAS SAG Meeting 26, Darmstadt 22 nd June 2011 GSN degradation due to large clock offset (Nov 2010) Slide: 14 GRAS monitoring was showing reduction of accepted measurements, and increase of wRMS.

GRAS SAG Meeting 26, Darmstadt 22 nd June 2011 Slide: 15 GSN degradation due to large clock offset (Nov 2010) Station clock ‘jump’ introduced a large clock drift, when realigning clock products Has been added to GSN daily quality report for easier identification if re-occurrence GSN has put in place mechanism to avoid re-occurrence

GRAS SAG Meeting 26, Darmstadt 22 nd June 2011 Degradation due to wrong estimation of clock bias Slide: 16 Clock bias estimation irregularity in GRAS POD causing large systematic biases in GRAS level 1b products Caused by unphysical Pseudoranges which are not rejected in the 2 nd SRIF run Manual reset of the second SRIF run was needed Better data cleaning for SRIF is being put in place Low elevation pass

GRAS SAG Meeting 26, Darmstadt 22 nd June 2011 Slide: 17 Instrument – Navigation Solution 9 th February 2010, GRAS reported invalid navigation (second time after 10 th July 2008). Many GPS outage result in larger Navigation orbit error (peak) Software patch (GOBS 1.9) to avoid the issue uploaded 5 th May GPS manoeuvre on the day of the upload (navigation solution not affected) Note that not all the GPS manoeuvres/outages affect the navigation solution PRN 11 Manoeuvre NANU PRN 29 Manoeuvre NANU PRN 26 Unusable NANU GOBS 1.9 uploaded to GRAS Not investigated

GRAS SAG Meeting 26, Darmstadt 22 nd June 2011 Instrument Related Issues  Data gaps in −raw sampling data −closed loop C/A data  Low L2 SNR “issue”  …and putting it into perspective  SNR Comparison GRAS vs. COSMIC / CHAMP / GRACE Slide: 18

GRAS SAG Meeting 26, Darmstadt 22 nd June 2011 Data Gaps (rising) SLTA [km] 9°N, 120°E 37°N, 147°E 28°N, 155°E

GRAS SAG Meeting 26, Darmstadt 22 nd June 2011 Closed Loop Data Gaps in Rising Occ’s  SLTA of highest gap in C/A carrier phase data (from October 2007)  About 33% of rising occultations are affected, 16% in total  Will have to live with this in “historic” data; workarounds and maybe a fix in the GRAS firmware in the future  Also: (more or less) all occultations have gaps in the RS part due to C/A code tracking losses

GRAS SAG Meeting 26, Darmstadt 22 nd June 2011 Low L2 SNR  C/A SNR < 200 for ≤ 1% of all occultations  P2 SNR < 50 for ≤ 7% of all occultations  Most pronounced in rising  no geographic distribution  GRAS tracks wrong portion of the code (“sidelobe tracking”)  in effect: large number of cycle slips in L2 phase data  Retrievals are either significantly noisier, or not useful at all; will flag these profiles as ‘bad’ (and work on cycle slip corrections if we find the time)

GRAS SAG Meeting 26, Darmstadt 22 nd June 2011 Upcoming Solutions Short term:  According to RUAG, all three problems are related to overly conservative settings of configuration parameters for –loss-of-lock indicators in the CL carrier phase tracking loop –loss-of-lock indicators in the C/A code during RS –Acquisition thresholds for P1/P2 codeless tracking  Unfortunately, changing these parameters requires a firmware patch  Request to implement parameter changes in onboard software has been issued to industry in late November; still waiting for completion of paperwork (at industry!), to be implemented as GOBS v1.10 (~September?) Long term:  Changes in tracking state machine?-> ESA study to be kicked off Post-GRAS:  Decoupling of RS and L2 tracking?-> ESA study to be kicked off

GRAS SAG Meeting 26, Darmstadt 22 nd June 2011 (Un-?) solution: Raising SLTA Threshold Initially:  Considered raising upper SLTA boundary for rising occultations to cover C/A data gaps with RS –L2 only available above km –requires extrapolation of ionospheric correction (implemented in v2.17, but problems identified) –requires further system modification at GRAS SAF to keep products at CAF and SAF consistent (nearly done)  Unfortunately, raising SLTA led to an increase (+ 6%) in the number of occultations with failed L2 acquisition  Will probably wait for results of GOBS v1.10 patch…  …or might require a further GOBS patch

GRAS SAG Meeting 26, Darmstadt 22 nd June 2011 SNR in Perspective Slide: %49.3% 50.2%6.2%

GRAS SAG Meeting 26, Darmstadt 22 nd June 2011 SNR in Perspective (cont’d) Slide: 25

GRAS SAG Meeting 26, Darmstadt 22 nd June 2011 GRAS SNR vs. COSMIC, CHAMP, GRACE Slide: 26

GRAS SAG Meeting 26, Darmstadt 22 nd June 2011 GRAS SNR vs. COSMIC, CHAMP, GRACE (cont’d)  GRAS data shows drop in C/No / SNR for NH; expected as noise is higher in the NH.  No similar signature in COSMIC, CHAMP or GRACE data.  Tom Meehan: JPL receivers use nominal No in their SNR calculation, not measured  Should we re-address the SNR calculation and presentation to allow for a more realistic / physical comparison with the US receivers? Slide: 27