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SENTINEL‐3: PREPARING FOR OPERATIONS

Susanne Mecklenburg, ESA Sentinel‐3 Mission Manager

Sentinel–3 Mission Overview

The Sentinel-3 Mission, being part of Copernicus SpaceComponent, is an operational mission in high-inclination,low Earth orbit.

Full performance achieved with 2 satellites in orbit (S-3A,-3B)

Sentinel-3 implements 3 core missions to deliver continuityto Sea and land color data, through OLCI (Ocean and Land

Color Instrument) at least at the level of quality of theMedium Resolution Imaging Spectrometer (MERIS)instrument

Sea and land surface temperature, through the SLSTR(Sea and Land Surface Temperature Radiometer) atleast at the level of quality of the Advanced Along-TrackScanning Radiometer (AATSR) instrument

Sea surface topography data, through a Topo P/Lincluding a Ku-/C-band Synthetic Aperture RadarAltimeter (SRAL) and a bi-frequency MicroWaveRadiometer (MWR), at least at the level of quality of theEnvisat Radar Altimeter (RA-2) system

In addition, the payload design will allow Data continuity of the Vegetation instrument (on SPOT4/5), Enhanced fire monitoring capabilities, Along-track SAR for coastal zones, in-land water and sea-ice

topography

The Sentinel‐3 Satellite

SAR Radar Altimeter

S-band Antenna

Laser Retro-Reflector

DORIS Antenna

Microwave Radiometer

Ocean and Land Colour Instrument

Sea and Land Surface

Temperature Radiometer

X-band AntennaSolar Panel

Main satellite characteristics• 1250 kg maximal mass• Volume in 3.89 m x 2.202 m x 2.207 m• Average power consumption of 1100 W• 7.5 years lifetime (fuel for 5 add. years)• Large cold face for optical instruments

thermal control• Modular accommodation for a simplified

management of industrial interfaces

Observation Data Management• 170 Gbit of observation data per orbit• Space to ground data rate 2 x 280 Mbps X-Band• 1 contact per orbit with Svalbard Ground Station• 3h delivery timeliness (from satellite sensing)

4

Sentinel‐3A Status

Sentinel‐3A Status

Sentinel‐3A in TAS test facilitiesin July 2015

Current launch window October 2015 Export licenses for S3A launch from Russia grantedPlatform readiness

Sentinel‐3A AIT progressing: Full satellite (including OLCI) integratedsince early July 2014

Mechanical Test Campaign successfully completed by end 2014 Alert on one component in SLSTR and MWR instruments affected

Sentinel‐3A campaign: preventive repair required, (completed onSLSTR, on‐going on MWR).

Payload readiness SRAL PFM instrument integrated on Satellite and tests on‐going. MWR PFM integrated on Sentinel‐3A satellite. Repaired unit (see

alert above) to be swapped in June. SLSTR‐FM2 most tests completed: electrical, mechanical, functional

as well as VIS radiometric calibration; further radiometriccalibration on SWIR and TIR ongoing; Shipment to TASF plannedend May 2015 for swap on Satellite mid‐June.

OLCI defective camera detected in Oct 2014 and replaced in Nov;root cause found; replacement of all OLCI‐A cameras with thoseproduced for OLCI‐B scheduled in July, after the SLSTR and MWRswap

Sentinel‐3B Assembly, Integration and Test on‐going

Copernicus: Programmatic Aspects

Past months fundamental in defining the management and implementation of Copernicus Space Component and the Sentinels operations

1. Providing the overall context:  EU Copernicus Regulation approved (applicable from 25 April 2014)

– Establishes principle of a full, open and free data policy– Defines responsibilities for ESA and EUMETSAT– Defines the financial envelope for entire Copernicus context, i.e. services, in‐

situ and space components2. Assigning roles to ESA and EUMETSAT:

− EU‐ESA agreement on implementation of Copernicus programme includingtransfer of ownership of the Sentinels (applicable from 1 Nov 2014)

− EU‐EUMETSAT agreement on the implementation of the Copernicus Programmeincluding the transfer of ownership of certain assets (applicable from 7 Nov2014)

NB: ESA and EUMETSAT share Sentinel‐3 operations.

ESA and EUMETSAT sharing operational tasks

EU

ESA EUMETSAT

EU-EUMAgreement

EU-ESAAgreement

ESA-EUMETSAT coordination for the CSC

operations

Operations, maintenance and evolution of

the Flight Operations Segment for routinephase, including mission planning, and

the Sentinel-3 Marine Payload DataGround Segment including the EUMETSATmulti-mission facilities

Operations, maintenance and evolution of

the Flight Operations Segment for LEOPand Commissioning phases

CSC shared multi-mission services (e.g.X-Band acquisition, POD)

the Sentinel-3 Land Payload DataGround Segment.

and Post-Launch space segment supportactivities

EU‐ESA Agreement on Copernicus 

EU‐ESA agreement on implementation of Copernicus programme including transfer of ownership of the Sentinels(applicable from 1 Nov 2014), defining scope of Copernicus work until 2021, role of ESA:

– Technical coordination of Copernicus Space Component, including definition of overall system architecture and its evolution based on user requirements

– Development of new dedicated missions recognising need to secure continuity with the A and B Sentinels: C and D models “shall respond to the same requirements as the A and B units and shall be equivalent both in terms of performance and operations capability”

– Operating Sentinel missions (except those operated by EUMETSAT)

– Providing access to Sentinel data

– Providing access to Copernicus Contributing Mission data, via DWH

– Managing funds, monitoring and control procedures etc

– Agreement establish EU ownership concept (at lift‐off) and defines procurement rules and guidelines

Archive and Offline Processing Centre

Mission Performance Centre (MPC)

Infoterra UK

Farnborough

Indra

Madrid

CLS Toulouse

Eumetsat Darmstadt

DLR Oberpfaffenho

fen

ACRI Nice

CLS Brest

S‐3 ground segment: Status

ALL FACILITIES SUPPORTING S‐3 GROUND SEGMENT ACTIVITIESARE ESTABLISHED

Stations: Data Acquisition and Near Real Time ProductGeneration: Data downlink, data processing (NRT and offline)For Sentinel‐3: Svalbard

Processing and Archiving Centres (PAC): perform the Sentinels’systematic non‐time‐critical data processing, the on‐the‐fly dataprocessing for specific cases and the reprocessing in case ofprocessing algorithms or calibration parameters upgrades.For Sentinel‐3: Archiving and offline processing centres

– DLR for OLCI processing and archiving– CLS for SRAL processing and archiving– ACRI for SLSTR and S‐3 synergy products processing and archiving

EUMETSAT’s marine centre acts as PAC for marine products.

Missions Performance Centre (MPC): Operational QualityControl, Expert Support Laboratories (ESL), Calibration andValidationFor Sentinel‐3: consortium led by ACRI

L2 Surface Topography

Products

L2 Surface Topography

Products

Topography processing chain based on altimeter radiometer and POD system data

Synergy ProductsSynergy Products

L1C: Hybrid processing chain based on combination of SLSTR and OLCI data

L1C

Ocean & Land Colour L2 Products

Ocean & Land Colour L2 Products

Ocean & Land ColourProcessing chain based on OLCI data

OLCI L1B

SLSTR Instrument

SLSTR Instrument

SRAL Instrument

SRAL Instrument

MWR Instrument

MWR Instrument

POD System

POD System

OLCI Instrument

OLCI Instrument

Sentinel-3: processing chains

Product delivery timeliness:• Near-Real Time (< 3 hr) availability of L2 products (and L1b)• STC/NTC delivery of higher quality topography products

L2 Surface Temperatures

Products

Surface Temperature Processing chain based on SLSTR data

SLSTR L1B

L1

Sentinel‐3 Core Data Products 

S‐3 production is globaland systematic

S‐3 production is NRT(<3h from sensing), STC(<48h from sensing) orNTC*

ESA & EUMETSAT ensurethe same S‐3 L1B coresystematic production

* production starts notlater than 24h from thereception of the lastnecessary data

EC change requests: 100% SAR(Status: Approved)

EC requested to operate SRAL in 100% SAR modeover land and ocean likewise (original baselinesplit LRM/SAR mode over land and ocean)

ESA's and EUMETSAT's updated technical andfinancial assessment has been approved by theCommission in February 2015

Expenditure for implementation comes from newEU/ESA and EU/EUMETSAT agreements, whichintroduced delay in implementation

The schedule for the implementation of thechange request foresees the completion of theactivities during the Sentinel‐3A ramp‐up, with theobjective is to be ready to support the Sentinel‐3Aroutine operations phase.

Implementation foresees release of additional L1data products (see table)

S‐3 will be the first mission to provide 100% SAR altimetry coverage!

Product Level

Product Description Relevance for

L1A Unpacked L0 data processed to engineering parameters with geo‐location information

SAR processing specialists allowing fundamental studies on SAR processing such as Doppler beam formation and calibration studies using ground‐based Transponders

L1B‐SC Geo‐located, Calibrated gathered azimuth formed complex (I and Q) power echoes after slant/Doppler range correction

geophysical retrieval algorithm developers (over ocean, land and ice surfaces), surface characterisations studies (e.g. impact of sea state bias, wave directional effects etc) and QC systems

L1B Geo‐located, Calibrated Multi‐looked power waveforms

geophysical retrieval algorithm developers and QC systems

EC change requests: AOD and FRP(Status: implementation under discussion)

STATUS First assessment sent to Commission

with preliminary cost estimate in July2013

MAG meeting October 2013: solutionfor algorithm development presentedfor discussion and advice

ESA and EUMETSAT working on updatedtechnical implementation at present.

Expenditure for implementation comesfrom new EU/ESA and EU/EUMETSATagreements as part of CSC evolution.

Implementation will start in the 2ndquarter of 2015, to be completed duringthe Sentinel‐3A ramp‐up phase.

Request from EC for two “new” operationalproductsFire Radiative Power Spatial resolution: 1 km (pixel level) with a threshold at 10km Temporal resolution: 1 hour, with a threshold at 3 days Accuracy: goal 10%, threshold 30% Detection threshold: goal 5MW, threshold 50 MW Latency: Near‐real time (< 3 h) Availability of products: goal 99%, with a threshold of 80%

Aerosol (Global) Spatial resolution: at pixel level (for regional applications), with a

threshold at 100km Temporal resolution: defined by SLSTR design Accuracy: goal over land AOD 0.1, over ocean AOD 0.05 Latency: Near‐real time (< 3 h) Availability of products: goal 99%, with a threshold of 80% Format: goal BUFR, with threshold for netcdf or other format

with decoding software Include uncertainties at pixel level (goal) AOD 550 nm over ocean and land (goal)

EC change requests: SYN(Status: implementation under discussion)

EC requested to improve “the timeframe for delivery of Sentinel‐3 Synergy products(both full resolution products (SY_2_SYN) and reduced resolution (SY_2 VGP,SY_2_VG1, SY_2_V10) with a commitment of availability within 24 hours.”

First assessment sent to Commission in January 2014 Detailed technical and financial assessment provided in March 2015, presently

under discussion with the EC Implementation of the change proposal for the activities under ESA’s responsibility

will start in the 2nd quarter of 2015, with the objective to be ready to support theSentinel‐3A ramp‐up and routine operations phase.

ESA: Sentinel‐3 Data Access

sentinel.esa.int: contains information about data and data access point to https://scihub.esa.int/

sentinel.esa.int: contains information about data and data access point to https://scihub.esa.int/

For ESA: open and free Sentinel‐3 data accesswill follow same principle as for Sentinel‐1, withdifferent access routes depending on usertypology Dedicated access for Copernicus Core

services Sentinel Scientific Data Hub (rolling archive,

self registration, limited quota) Collaborative Ground segment: national use International Agreements: bilateral data

transfer as requested by EC

MAIN MESSAGES 

Readiness of Sentinel‐3A platform andinstrument integration and testing on trackwith some technical issues to solve

Launch window foreseen for Q4 2015 EU‐ESA and EU‐EUMETSAT agreements signed

and in place now, providing full coverage for S‐3 mission operational costs and programmaticframe for joint operations between ESA andEUMETSAT

All ground segment facilities supporting the S‐3 operations are in place

EC issued some change requests to missionbaseline (SRAL 100% SAR operations,additional products: AOD, FRP, SYN within 24h), which are presently under investigation andimplementation

Data access will follow same route as forSentinel‐1 for ESA and through EUMETCast forEUMETSAT

Please note Sentinel‐3 for science workshop, 2‐5 June2015, Venice, Italy(http://seom.esa.int/S3forScience2015/)