Slide 1 Second GPS/RO Users Workshop, August 22 - 24, 2005. The EUMETSAT Polar System GRAS SAF and...

Second GPS/RO Users Workshop, August 22 - 24, 2005.

The EUMETSAT Polar SystemThe EUMETSAT Polar SystemGRAS SAF and Data ProductsGRAS SAF and Data Products

Martin B. Sorensen

GRAS SAF ProjectAtmosphere Space Research DivisionDanish Meteorological Institute (DMI)

Copenhagen


Outline of presentationOutline of presentation

• Introduction

• EUMETSAT Polar System

• The EUMETSAT Satellite Application Facilities

(the SAF concept)

• GRAS Measurement System

• The GRAS SAF Operational Centre

• GRAS SAF products

• GRAS SAF product dissemination and archives

• Summary


IntroductionIntroduction

• EUMETSAT Polar System (EPS) is the European component of

the joint European/US polar satellite system (IJPS)

• EPS mission consists of three Metop satellites with a payload of

eight meteorological instruments

• The first Metop satellite is launched in second half of 2006

• The total duration of the EPS mission is 14 years

• GRAS receiver has been developed especially for radio

occultation measurements within the EPS framework by ESA

and EUMETSAT

=> NRT products for NWP applications and continuity of radio

occultation data for climate monitoring


Initial Joint Polar SystemInitial Joint Polar System

NOAA N & N’ p.m.

METOP 1 & 2 a.m.

Global datadump

Global datadump

NOAA GSEPS GS

NOAA global dataMETOP blind orbits

METOP global dataNOAA blind orbits

Blind orbitsdata dump

SAF

SAF

EUMETSAT POLAR SYSTEMNOAA POES SYSTEM

SAF

SAF

SAF

SAF


GRAS receiverGRAS receiver

• 12 bi-frequency channels

• Codeless-mode capability

• Oven stabilised USO (Allan deviation 10-12)

• Directional high gain occultation antennas for minimising local multipath

• Onboard DSP => autonomous operations

506 mm

860

mm

47 m m


The EUMETSAT Satellite Application Facilities The EUMETSAT Satellite Application Facilities

The SAF conceptThe SAF concept


MSG

EPS/Metop

Applications Ground Segment

Centralisedprocessingand generationof products

Decentralisedprocessingand generationof products

Data Acquisitionand Control

Data ProcessingEUMETSAT HQ

Meteorological ProductsExtraction Facility (MPEF)

EUMETSAT HQ

Unified MeteorologicalArchive & RetrievalFacility (U-MARF)EUMETSAT HQ

GRAS SAF

Satellite ApplicationFacilities (SAFs)

USERS

Distributed Ground SegmentDistributed Ground Segment


GRAS SAF Overview and PlansGRAS SAF Overview and Plans

• GRAS Satellite Application Facility (SAF) started in 1999– Operational facility for atmosphere products from GRAS instrument on

Metop (Launch planned 2006)– 7 year developments

• Partner Institutes– Danish Meteorological Institute (Host institute)

– K.B. Lauritsen, M.B. Sørensen, F. Rubek– Met Office, UK

– D. Offiler, Axel v. Engeln, C. Marquardt, (S. Healy)– Institut d’Estudis Espacials de Catalunya (IEEC), Spain

– A. Rius, S. Oliveras• Milestones

– 2004 System test and verification– 2005 Integration test– 2006 Commissioning of Metop – 2007 Operational products from GRAS SAF


The GRAS measurement systemThe GRAS measurement system


NRT ChallengeNRT Challenge

• EPS GRAS is the first RO mission that has been from the beginning designed for operational applications

• NRT requirements for GRAS product dissemination are 2 h 15 min for level 1b and 3 h for level 2 from the observation

• Analysis of the NRT feasibility has revealed two main risks:– Timely availability of the auxiliary data– NRT Precise Orbit Determination of the LEO satellite

• Mitigation of these risks is incorporated in the GRAS Measurement System design

• There has been no reason to compromise the occultation data processing due to the NRT requirements


GRAS Measurement SystemGRAS Measurement SystemM etop

EPS Polar s ite

EU M ETSATEPS C G S

U SER S

G R ASM eteorology SAF

hosted by D M ILevel 2 products

Level 1b products

G PS systemO ccultation &

navigation

Tracking

G R AS G SN Service

• GRAS Ground Support Network (GSN) provides GPS POD products and ground based measurements

• Level 1b products are processed and disseminated by the EPS Core Ground Segment (CGS)

• Level 2 products are processed and disseminated by the GRAS Meteorology SAF

• Archived products include raw data, level 1b, level 2 and all GSN products

• Off-line user access to archived products via EUMETSAT UMARF


GRAS Ground Support Network (GSN)GRAS Ground Support Network (GSN)

• GRAS GSN is a service to provide GPS state vectors, clock

offset estimates, and clock differencing data for GRAS data

processing

• GSN will contain a network of 25 fiducial stations

• GSN coverage for the GPS constellation is > 200 % to ensure

service availability via redundancy

• The GSN Service is designed to support the GRAS NRT data

processing requirements


GPS Satellite Visibility GPS Satellite Visibility


The GRAS SAF operational processing centreThe GRAS SAF operational processing centre


GRAS SAF Operationel SystemGRAS SAF Operationel System

G S N

RMDCN / GTS(EUMETCast?)

GRAS SAF productsin NRT to users

Task Manager & User facilities

Satellite dish

FTP/HTTP Server

GTS Interface

Data switch

Firewall

Router

Firewall

Router

Firewall

UMARF Client

Internet

RMDCN

Receiving GRASLevel1B data fromEUMETSAT CGS

Processor #1 Processor #2Data Retriever

Nominalprocessing

chain

Backlog &Reproces-sing chain

GSN

Data Retriever

Off-Line Processorbackup

Off-Line Processor

NRT Processorbackup

NRT Processor

ECMW F

DMI GRIB DB

GRAS SAFLocal Archive

DMI Central Archive

EUMETCAST Term inal Backup

EUMETCAST Term inal

DVB Router

DVB Router Backup

EUMETSAT

ECMW F

USERS

UMARF

EPS


EUMETCast coverageEUMETCast coverage


The GRAS SAF ProductsThe GRAS SAF Products


Data and software products from Data and software products from the GRAS SAFthe GRAS SAF

• Data products (Level 2) in NRT (3 hrs)– Refractivity, Temperature, Pressure and

Humidity profiles– Surface pressure

• Data products Offline– Reprocessed level 2 products – Bending angle (Level 1)

• ROP Package– 3/4DVAR Assimilation Software– Pre-processing tools – Forward operators– Error covariance matrix

DMI processing center

Met Office


The GRAS data distribution & archivesThe GRAS data distribution & archives


NRT Dissemination via RMDCNNRT Dissemination via RMDCNEUMETCast ?EUMETCast ?

Viln iusC o p e nh a g e n

Zü ric h

Ta llin

Rig a

EC M WF

He lsinki

Re ykja vik

Anka raRe yka vikAthe ns

Re yka vikBud a p e st

Ljub ja na

Re yka vikO ffe nb a c h

Re yka vikZuric h

Re yka viVie nna

Re yka vikC o p e nha g e n

No rd kö p ing

Re yka vikHe lsinkiO slo

EC M WF

Ro m e

Re yka vikM a d rid

Re yka vikLisb o n

Re yka vikTo ulo use

Brusse ls

De Bit

Za g re b

Re yka vikRe ykja vik

Re yka vikDub lin

Regional Meteorological Data Communication Network for ECMWF and WMO Region VI


Off-line and reprocessed data via UMARF Off-line and reprocessed data via UMARF - or from the local GRAS SAF archive- or from the local GRAS SAF archive

Unified Meteorological Archive and Retrieval Facility Unified Meteorological Archive and Retrieval Facility


UMARF V2 – Product DetailsUMARF V2 – Product Details


SummarySummary• The objective of the EPS GRAS mission is to provide NWP users

operationally radio occultation data products

• The EPS mission starts in 2006 and provides data continuously at least for 14 years

• GRAS data processing and dissemination are performed by the EPS CGS (level 1b ) and by the GRAS Meteorology SAF (level 2 )

• All archived GRAS products (level 0, level 1b, and level 2) shall be made available via the EUMETSAT UMARF facility

• Analysis and study results indicate that the NRT data processing with the required accuracy is feasible for about 92 % of the observations

www.eumetsat.int & http://grassaf.dmi.dkwww.eumetsat.int & http://grassaf.dmi.dk

Slide 1 Second GPS/RO Users Workshop, August 22 - 24, 2005. The EUMETSAT Polar System GRAS SAF and...

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