Ediz.: Issue: 02. Of 20 Titolo : Title : Firma Signature. Data Date 22/07/ /07/ /07/ /07/2014

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1 Tipo Doc.: Doc.Type: N Doc.: Doc. N : LIST N DRD: DRD N : 21/07/14 MWI-PM-30 1 Di Of Titolo : Title : Preparato da: Prepared by: Nome & Funzione Name & Function MWI Team Firma Signature Data Date LISTA DI DISTRIBUZIONE DISTRIBUTION LIST Interna / Internal N A I Approvato da: Approved by: T. Lupi (CGS-SE) L. Cremonesi (CGS-PA) C. Cinquepalmi (CGS- CC) 22/07/14 22/07/14 22/07/14 Applicazione autorizzata da: Application authorized by: A. Sacchetti (CGS-PM) 22/07/14 Esterna / External Customer / Higher Level Contractor Accettato da: Accepted by: Approvato da: Approved by: N=Numero copie A=Applicazione I=Informazione N=Number copy A=Application I=Information Gestione documenti: Data Management: Firma / Signature Data / Date File: _v2 List Acronyms and abbreviation

2 2 21/07/14 EDIZIONE ISSUE DATA DATE REGISTRAZIONE DELLE MODIFICHE / CHANGE RECORD AUTORIZZAZIONE CHANGE AUTHORITY 01 19/10/12 First Issue for Proposal 21/07/14 Second Issue for SSR OGGETTO DELLA MODIFICA E SEZIONI AFFETTE REASON FOR CHANGE AND AFFECTED SECTIONS

3 3 21/07/14 LISTA DELLE PAGINE VALIDE / LIST OF VALID PAGES PAGINA PAGE EDIZIONE ISSUE PAGINA PAGE EDIZIONE ISSUE PAGINA PAGE EDIZIONE ISSUE PAGINA PAGE EDIZIONE ISSUE PAGINA PAGE EDIZIONE ISSUE

4 4 21/07/14 TABLE OF CONTENTS 1. INTRODUCTION AND SCOPE DOCUMENTS APPLICABLE DOCUMENTS LIST OF DEFINITIONS GENERAL TERMS AND DEFINITIONS OF MWI TERMS AND DEFINITIONS RELATED TO MWI RELIABILITY REQUIREMENTS TERMS AND DEFINITIONS RELATED TO THE EPS-SG SYSTEM AND ITS DECOMPOSITION INTO LOWER LEVELS TERMS AND DEFINITIONS RELATED TO THE METOP-SG DATA PRODUCTS TERMS AND DEFINITIONS RELATED TO METOP-SG POINTING, VIEWING, REVISIT AND COVERAGE REQUIREMENTS LIST OF TABLES Table 2-1: Applicable documents... 6

5 1. INTRODUCTION AND SCOPE MetOp-SG MWI 5 21/07/14 The present document, referenced as MWI-PM-30 accorng to the document list reference (DLR), includes the list acronyms, abbreviations and definitions used in the submitted proposal, S Issue 1, for MetOp-SG MicroWave Imager (MWI).

6 21/07/ DOCUMENTS 2.1 APPLICABLE DOCUMENTS AD AD01 AD AD03 Doc. No. Issue/ Rev. Reserved Reserved Reserved AD04 MOS-SOW-ADS-SATB Statement Of Work for the MicroWave Imager [SOW-MWI] AD05 AD06 AD07 AD08 AD09 MOS-SP-ADS-SATB AD10 AD11 AD12 AD13a MOS-SP-ASF-SYS AD13b MOS-SP-ASF-SYS Reserved Reserved Reserved Reserved Title Technical Requirements Specification for the MicroWave Imager Instrument [TRS-MWI] Reserved Reserved Reserved MetOp-SG Instrument General Design and Interface Requirements [INS-GDIR] MetOp-SG Units General Design and Interface Requirements [Units GDIR] AD13c ENS ASTR 8.0 General Design and Interfaces Requirements [Generic GDIR] AD14 MOS-RS-ESA-INS MetOp-SG Instruments Product Assurance and Safety Requirements [PARD] AD14b MOS-SP-ASF-SYS MetOp-SG Product Assurance Requirements for Suppliers AD14c MOS-SP-ASF-SYS MetOp-SG Stware Product Assurance Requirements for Suppliers AD15 MOS-RS-ESA-INS MetOp-SG Instruments Project Management Requirements [MARD] AD16 MOS-LI-ESA-SYS MetOp-SG Deliverable Items and Services List [DISL] AD17 MOS-LI-ESA-INS MetOp-SG Instruments Document Requirements List [DRL] AD18 MOS-LI-ESA-INS MetOp-SG Instruments Document Requirements Definition [DRD] AD19 MOS-RS-ESA-INS MetOp-SG Instruments Tailoring Of ECSS-E Standards AD MOS-RS-ESA-ENV MetOp-SG Environmental Specification AD21 MOS-HB-ESA-INS AD22 MOS-RS-ESA-SYS AD23 MOS-RS-ESA-MWI MetOp Second Generation Instruments - Phases B2, C/D and Support to Phase E - Subcontractor Selection Procedure and Tender Evaluation Handbook MetOp-SG Space Segment General Design and Interfaces Requirements [GDIR] Instrument Requirements Specification for the MicroWave Imager [IRS-MWI] Table 2-1: Applicable documents

7 /07/14 Acronym/Abbreviation 3MI ABCL ACST AD ADC ADS AIT AIV AKE AME AMSR AOCS APE APID AR ASF ASIC ATBD ATMS BB BE BI BOL BRC BS CA CAD CAM CIDL CCN CCR CDR CDPU CETeF CEOS CFI CFRP CIDL CNES CGS CLS CNR-ISAC CoG COM COTS CP CPI CPP CPPA CR Meaning Multi-viewing, Multi-channel, Multi-polarization Imager As Built Configuration List Advanced Compound Semiconductor Technologies GmbH Applicable Document Analog to Digital Converter Airbus Defence & Space Assembly, Integration and Test Assembly, Integration and Verification Absolute Knowledge Error Absolute Measurement Error Advanced Microwave Scanning Raometer Attitude and Orbit Control Subsystem Absolute Pointing Error APplication IDentifier Acceptance Review Astrium SAS France Application Specific Integrated Circuit Algorithm Theoretical Baseline Document Advanced Technology Microwave Sounder BreadBoard Back End Image Bias Beginning Of Life Basic Repeat Cycle Satellite Bias Calibration Assembly Computer Aided Design Collision Avoidance Manoeuvre Configuration Item Data List Contract Change Notice Compensated Compact Range Critical Design Review Control and Data Processing Unit Coornated European Test Facilities Committee on Earth Observation Satellites Customer-Furnished Instrument Carbon Fiber Reinforced Plastic Configuration Item Data List Centre National d Etudes Spatiales CGS S.p.A. - Compagnia Generale per lo Spazio Collect Localisation Satellites Consiglio Nazionale delle Ricerche Istituto Scienze Atmosferiche e del Clima (Institute Atmospheric Sciences and Climate the Italian National Research Council) Centre Gravity COmmissioning Phase Commercial Off-The-Shelf Ceiling Price Contractor Provided Instrument Centralized Parts Procurement Centralized Parts Procurement Agent Cost Reimbursement

8 8 21/07/14 DC DCL DCS DISL DD DDBS DDV DDR DEM DHS DISL DLR DM DML DoCon DPL DPM DRD DRL DRO DSB DVD ECMWF ECP ECSS EEE EFM EGSE EIRP EM EMC EOL EPS EPS-SG EPSS EQM EQSR ES ESA ESM ESTL EUMETSAT EVA EVDB FAR FAR FDIR FE FEE FEM FESA FFT FFP FM FMECA Duty Cycle Declared Component List Data Collection Service Deliverable Items and Service List Direct Detection Direct Data Broadcast Service Design, Development and Verification Detailed Design Review Digital Elevation Model Data Handling Subsystem Deliverable Items and Services List Deutsches Zentrum für Luft und Raumfahrt Development Model Declared Material List Down Converter Declared Process List Detailed Processing Model Document Requirements Definition Document Requirements List Dieletric Resonant Oscillator Double Side Band Digital Versatile Disc European Centre for Meum-range Weather Forecasts Engineering Change Proposal European Cooperation for Space Standarzation Electrical, Electronic and Electro-Mechanical Electrical Functional Model Electrical Ground Support Equipment Equivalent Isotropically Raated Power Engineering Model Electro-Magnetic Compatibility End Of Life EUMETSAT Polar System EUMETSAT Polar System-Second Generation Electrical Power Supply Subsystem Engineering Qualification Model Engineering Qualification Status Review Environment Simulator European Space Agency Emergency and Safe Mode European Space Tribology Laboratories European Organization for the Exploitation Meteorological Satellites Extreme Value Analysis Engineering Verification Data Base Flight Acceptance Review False Alarm Rate Failure Detection Isolation and Recovery Front-End Front-End Electronics Finite Element Model/Method Front-End Sub-Assembly Fast Fourier Transform Firm Fixed Price Flight Model Failure Modes, Effects & Criticality Analysis

9 9 21/07/14 FOV FOM FP FPA FPGA FPV FS FSS FWHM GCP GDDS GDIR GMF GMI GMM GN2 GNSS GPHA GPIB GPP GS GS-5 GSE GSM GWF H H/W H&V HD HH HF HKTM HPA HPBW HRPT HV HW I/F I/O IAF IASI-NG IASW ICD ICI ICU IDS INR IOAP IOCP IR IRD IRDB IRF IRS ISLR Field Of View Flight Operations Manual (Firm) Fixed Price Focal Plane Assembly Field Programmable Gate Array Fixed Price with Variation Flight Spare Frequency Selective Surface Full Width Half Maximum Ground Control Point Global Data Distribution Service General Design and Interface Requirements Geophysical Model Function GPM Microwave Imager Geometrical Mathematical Model Gaseous Nitrogen Global Navigation Satellite System Gaussian Priled Horn Antenna General Purpose Interface Bus Ground Processor Prototype Ground Segment Gmes Sentinel-5 Ground Support Equipment Ground Scan Mechanism Geophysical Model Function Horizontal polarisation HardWare Horizontal & Vertical Heterodyne Detection Transmission in horizontal polarisation and reception in horizontal polarisation High Frequency House-Keeping TeleMetry High Power Amplifier Half Power Beam Width High Resolution Picture Transmissions Horizontal-Vertical Polarization HardWare InterFace Input/Output Fraunher Institute for Applied Solid-State Physics Infrared Atmospheric Sounder New Generation Instrument Application StWare Interface Control Document Ice Could Imager Instrument Control Unit Instrument Data Simulator Interface to Noise Ratio Initial Orbit Acquisition Phase In-Orbit Commissioning Phase Infra-Red Interface Requirements Document Instrument Reference Data Base Impulse Response Function Instrument Requirements Specification Integrated Side Lobe Ratio

10 10 21/07/14 ISS ISVV ITT ITU JPL KBF KIP KO LAN LEO LEOP LF LLD LLI LLRS LN2 LNA LO LSB LSB LTM M&C MADRAS MAIT MARD MCA MCS METimage MetOp MetOp-SG MGSE MHEMT MHS MICD MIER MIP MLI MMI MMIC MOS MPM MRB MRD MTF MTP MTR MWI MWS NA NCR NEA NEDL NEΔT NEDT NF International Space Station Independent Stware Verification and Validation Invitation To Tender International Telecommunications Union Jet Propulsion Laboratories K-Band Feed Key Inspection Point Kick-Off Local Area Network Low Earth Orbit Launch and Early Orbit Phase Low Frequency Launch Locking Device Long Lead Items Low Level Resonance Search Liquid Nitrogen Low Noise Amplifier Local Oscillator Least Significant Bit Lower Side band Life Test Model Monitoring & Command Microwave Analysis and Detection Rain and Atmospheric Systems Manufacturing, Assembly, Integration and Test MAnagement Requirements Document Monte Carlo Analysis Mission Control System Visible and infrared imager for meteorological observations Meteorological Operational MetOp-Second Generation Mechanical Ground Support Equipment Metamorphic High Electron Mobility Transistor Microwave Humity Sounder Mechanical Interface Control Document MIER Comunicaciones SA Mandatory Inspection Point Multi Layer Insulation Man Machine Interface Monolithic Microwave Integrated Circuit MetOp Second generation Microwave Power Module Material Review Board Mission Requirements Document Modulation Transfer Function Master Test Processor Mid Term Review MicroWave Imager MicroWave Sounder Not Applicable Non-Conformance Report Non Explosive Actuator Noise Equivalent Differential Raance Noise Equivalent Differential Temperature Noise Equivalent Differential Temperature Noise Figure

11 11 21/07/14 NIR NOAA NOM NRB OAT OBA OBAM OBCP OBCT OBSW OGSE OHB OIRD OMT OSS OTS OZA PA PARD PBL PC PCB PCR PD PDF PDHT PDR PDTD PEPS PFB PFM PLUTO PMP PMS PO POD PRF PRR PSA PSF PSLR PSR PWR PUS QLTM QM QR QSL R&D RAL RAM RAMS RAT RD RER Near Infra-Red National Oceanic and Atmospheric Administration Nominal Phase Non-conformance Review Board Orbit, Attitude and Time On Board Angle On Board Algorithm Model On Board Control Procedure On Board Calibration Target On Board StWare Optical Ground Support Equipment Orbital- und Hydrotechnologie Bremen-System GmbH Operations Interface Requirements Document Ortho Mode Transducer Observing System Simulator Off The Shelf Observation Zenith Angle Product Assurance Product Assurance Requirements Document Planetary Boundary Layer Personal Computer Printed Circuit Board Preliminary Concept Review Probability Detection Probabilistic Distribution Function Payload Data Handling and Transfer Preliminary Design Review Power and Data Transfer Device Post-EPS Polyphase Filter Bank Proto-Flight Model Procedure Language for Users in Test and Operations Parts, Material and Processes Polarisation Measurement System Physical Optics Precise Orbit Determination Pulse Repetition Frequency Preliminary Requirements Review Part Stress Analysis Point Spread Function Peak Side-Lobe Ratio Pre Storage Review Power Packet Utilization Standard Qualification Models Life Time Qualification Model Qualification Review Quasi Static Load factor Research and Development Rutherford Appleton Laboratory Random Access Memory Reliability, Availability, Maintainability and Safety Rotation Angle Trigger Reference Document Raation Energy Raometer

12 12 21/07/14 RF RFA RFC RFD RF GSE RFI RFI RFI mitigation RFP RFQ RFW RKE RMS RO ROM ROM RP RPE RPG RPM RSS RX S5 S/C S/W SAF SAR SAT SATSIM S/C SCA SCE SCDB SCOT SCM SDE SDVE SEL SEM SEU SHP SIGIRD SI SIOV SIOVR SNR SPF SODAP SOW SpEng SPG SRD SRDB SRR SSA Rao Frequency Rao Frequency Assembly Rao Frequency Compatibility Request For Deviation Rao Frequency Ground Support Equipment Request For Interest Rao Frequency Interference Rao Frequency Interference mitigation Request For Proposal Request For Quotation Request For Waiver Relative Knowledge Error Root Mean Square Rao Occultation sounder Rough Order Magnitude Read Only memory Rotating Positioner Relative Pointing Error Raometer Physics GmbH Rate Per Minute Root Sum Squared Receiver Sentinel-5 instrument SpaceCraft StWare Satellite Application Facility Search And Rescue Start Acquisition Trigger SATellite SIMulator SpaceCraft SCAtterometer SCan Electronics Satellite Characterisation Data Base Special Contions Of Tender SCan Mechanism Stware Development Environment Stware Development and Validation Environment Single Event Latch-up Space Environment Monitor Single Event Upset Sub-Harmonically Pumped Space-to Ground Interfaces Requirements Document Système International units Satellite In-Orbit Verification Satellite In-Orbit Verification Review Signal to Noise Ratio Single Point Failure Switch-On and Data Acquisition Phase Statement Of Work Space Engineering S.p.A. Space Engineering S.p.A. System Requirement Document Satellite Reference Data Base System Requirements Review Spatial Sampling Angle

13 13 21/07/14 SSD SSM SSMI SSO SSP SSRD SSST STM STR SVF SVT SW SWE SWIR SZA TAR TBC TBD TC TCS TCSS TICD TIR TM TMM TM/TC TMTC TOA TOPE TRB TRL TRR TT&C UART UHM UML USB UTC UTM UV V VCD VDA VH VIS VM VNIR VV WBS WCA WGS8 4 WPD YSM Spatial Sampling Distance Second Surface Mirror Special Sensor Microwave Imager Sun Synchronous Orbit Sub-Satellite Point Space Segment Requirements Document Single Space Segment Team Structural and Thermal Model Star Tracker Stware Validation Facility Stware Validation Test StWare Snow Water Equivalent Short Wave Infra-Red Sun-Zenith Angle Total Ambiguity Ratio To Be Confirmed To Be Determined/Defined TeleCommand Thermal Control System Thermal Control Sub-System Thermal Interface Control Document Thermal Infra-Red TeleMetry Thermal Mathematical Model TeleMetry and TeleCommand TeleMetry and TeleCommand Top Of Atmosphere Test Operation Procedure Environment Test Review Board Technology Reaness Level Test Reaness Review Telemetry, Tracking and Command Universal Asynchronous Receiver and Transmitter Ultra High Modulus Universal Modelling Language Upper Side Band Universal Time Counter Universal Transverse Mercator Ultra-Violet Vertical polarisation Verification Control Document Vacuum Deposite Aluminium Vertical-Horizontal Polarization Visible Virtual Machine Visible and Near Infra-Red Transmission in vertical polarisation and reception in vertical polarisation Work Breakdown structure Worst Case Analysis World Geodetic System, 1984 version Work Package Description Yaw Steering Mode

14 14 21/07/14 4. LIST OF DEFINITIONS This chapter contains definitions and assumptions, which are applicable to the MWI Instrument, and shall be used consistently by all entities involved in the MWI project, inclung subcontractors and suppliers. The definitions are derived from IRS (MOS-RS-ESA-MWI-0429) section 2.4 and section 2.5 (see [AD23]), and from GDIR (MOS-RS-ESA-SYS-0433) sections 2.2 and 2.3 (see [AD22]). 4.1 GENERAL TERMS AND DEFINITIONS OF MWI Bandwidth Spectral width at which the power response is half the maximum value. Beam Efficiency Integrated power in the main beam relative to the total power received by the antenna. Includes co-polarisation and cross-polarisation components. Channel Spectral element which can compose single element or multiple sub-channels. Channel Bandwidth Half-power point bandwidth. Channel shape The spectral response the instrument over a defined range frequency(ies). Channel shape refers to the overall response the instrument (from the antenna aperture to the instrument output). Dynamic range Range brightness temperatures within which requirements are to be met. Effective field View (EFOV) Effective area swept by the antenna beam during the integration time. Footprint The area is defined by the instantaneous intersection the antenna pattern at the half power level at the Earth s surface. For conically scanning instruments, where the footprint is elliptical, footprint is the arithmetic mean the two axes. Frequency Stability Maximum fference between the real frequency and the actual frequency assigned. Gain See system gain. Half Power Beamwidth (HPBW) Angle at which the antenna's power raation pattern is at half its maximum value. Horizontal Polarisation (H) Electric field is perpencular to the plane incidence. Instantaneous Field View (IFOV) See definition on footprint. Kurtosis Algorithm The microwave raometer amplitude power density function signal is Gaussian stributed. Kurtosis k is given by a ration

15 15 21/07/14 Where x(t) is the pre-detection signal and represents statistical expectation. For a gaussian stributed signal, the kurtosis is always equal to 3. Main Beam The main beam is defined as equal to 2.5 times the HPBW. Out--band rejection The minimum level suppression a signal outside specified channel. Raometric accuracy Difference between the result a measurement and a true value the measurement. Raometric Sensitivity (NEΔT): Smallest change in input brightness temperature or raance that can be detected in the system output for an integration time that is compliant with the sampling stance. The sensitivity requirement applies to calibrated raances and is applicable throughout the dynamic range. System noise, gain variations and calibration noise shall be taken into account when calculating the sensitivity. Following formula shall be used: where TSYS is the receiver noise temperature (inclung antenna losses), Tscene is the scene temperature, B is the bandwidth, τ is the integration time, ΔG/G is the receiver gain variation, τc is the calibration target integration time and N is the amount calibration cycles averaged. Scene Temperature Earth Scene temperature 280 K shall be used, assuming earth is a perfect blackbody. Spatial Sampling Distance (SSD) Distance between the centre adjacent EFOV samples on the Earth s surface. Sub-channel Spectral element, which together with other sub-channels forms a channel. System Gain The overall gain the instrument channel (from the antenna aperture to the instrument output). Vertical Polarisation (V) Electric field is parallel to the plane incidence. Wide Beam The wide beam is defined as 3.0 times the full beam width between the half-power points (i.e. 3.0 times the FWHM). Wide Beam Efficiency The wide-beam efficiency is defined as the ratio total (cross- and co-polarised) energy received by an antenna within its wide beam to the total energy received from all angles, assuming isotropic and unpolarized illumination broad-band noise such as thermal raation.

16 16 21/07/ TERMS AND DEFINITIONS RELATED TO MWI RELIABILITY REQUIREMENTS Failed Channel MWI channel is considered failed if any the following requirements fall below requirement [R] value the requirement: R-MWI-0130, R-MWI-0140, R-MWI-0150, RMWI-, R-MWI-30, R-MWI-40, R-MWI-70, R- MWI-80, R-MWI-90, RMWI-0300, R-MWI-03, R-MWI-0330, R-MWI-0350 AND R-MWI-14. Failed Channel (dual polarisation channel) For channels MWI-1, MWI-2, MWI-3, MWI-4, MWI-5, MWI-6, MWI-7 and MWI-8, loss a single polarisation is considered as a loss channel. Failed Instrument The complete MWI instrument is considered failed if one below occurs: Loss more than one channels among MWI-1, MWI-2 or MWI-3, Loss more than one the channels among MWI-8 or MWI TERMS AND DEFINITIONS RELATED TO THE EPS-SG SYSTEM AND ITS DECOMPOSITION INTO LOWER LEVELS The overall EPS-SG System is composed the following levels decomposition (product tree decomposition): Level 1: The overall EPS-SG System, broken down into Segments. Level 2: The EPS-SG Segments, broken down into Elements. The EPS-SG Level 2 Segments are: EPS-SG Space Segment / MetOp-SG Satellites Launcher Segment EPS-SG Ground Segment EPS-SG Users and Services Segment Level 3: The EPS-SG Elements, broken down into Sub-Systems. Level 4: The EPS-SG Sub-Systems, broken down into Units or Equipment. Level 5: The EPS-SG Unit and Equipment. System [Level 1] Set interdependent segments and/or elements constituted to achieve a given objective by performing together a specified function. In this document, System is used to incate the highest level [Level 1] logical decomposition, i.e. the overall EPS-SG System. Segments [Level 2] The physical or logical parts the first level decomposition the EPS-SG System, namely: the Space, Launcher, Ground and the Users and Services Segments. The EPS-SG Space Segment is composed the MetOp-SG Satellite(s). Satellite or Spacecraft [Level 2 Space Segment] The terms satellite and spacecraft are used infferently to refer to each the independently flying Elements the space segment. It comprises all hardware to be placed into low earth orbit with the exception the launch vehicle. In turn, the satellite is composed the platform and the payload as its two main elements. Users and Services Segment [Level 2 Segment] The physical and logical parts that will process further the data provided by EUMETSAT EPS-SG System; so to deliver products and services to the users. These parts are outside the EPS-SG System and they are not specified by ESA. Nevertheless, a thorough understanng how they work is necessary for the proper design the functions to be fulfilled by the EPS-SG System, especially its interfaces. Elements [Level 3] The physical or logical parts the second level decomposition the EPS-SG Segments [Level 2]. The Level 3 Elements the Level 2 Space Segment are: The platform each satellite,

17 17 21/07/14 The payload Instruments accommodated on each Satellite. Sub-Systems [Level 4] The physical or logical parts the next level decomposition the platform or payload, e.g. thermal [TCHS] or data handling [DHS] sub-systems. This decomposition is used for engineering convenience and it does not imply any specific breakdown management or responsibility. Unit or Equipment [Level 5] The physical or logical parts a Level 4 sub-system. User [part the Level 2 Segment] Anybody using any EPS-SG and/or Services Segment derived data and information. 4.4 TERMS AND DEFINITIONS RELATED TO THE METOP-SG DATA PRODUCTS Availability The probability that the space segment and the link to the ground segment provide the required data service to the ground segment. All sources unavailability shall be considered. Examples are planned and unplanned orbital excursions, atmospheric effects and single event upsets due to cosmic ray effects. For specific observation missions, instrument availability covers the instrument itself and all on-board elements needed to support the instrument, inclung the satellite data chain and the downlink transmission Ancillary data Data acquired on-board in support the observation data, related to both payload and platform, such as calibration and timing data Consistency The quality that ensures that a given series data has the same level quality and it has all been processed accorng to the same set standards. Consistency is important to ensure the long term coherence quality needed by Climate Science Data level definitions The following CEOS compliant definitions data level and products are used: Observation Data Level 0 Raw observation data after restoration the chronological data sequence for the instrument operating in observation mode, at full space/time resolution with all supplementary information to be used in subsequent processing (e.g. orbital data, health, time conversion, etc.) appended, after removal all communication artefacts (e.g., synchronization frames, communications headers, duplicated data). Level 0 data are timetagged. The precision and accuracy the time-tag shall be such that the measurement data will be localized to accuracy compatible with the Users requirements. Calibration Data Level 0 Raw observation data after restoration the chronological data sequence for the instrument(s) operating in calibration mode. Observation Data Level 1a Level 0 data with corresponng raometric and spectral correction and calibration computed and appended, but not applied, and possibly with preliminary geometric correction not altering the raometry (i.e. integer shift). Observation Data Level 1b Level 1a data not re-sampled, quality-controlled and raometrically calibrated, spectrally characterised, geometrically characterised, annotated with satellite position and pointing, geolocation inferred from satellite pointing information and preliminary pixel classification (e.g. land/water/cloud mask).

18 18 21/07/14 Data driven This is the mode where the payload data processing, archiving and sseminating occurs as the data are received without requiring operators for checking that events are progressing accorng to a predefined schedule. Data pull This is the data delivery mode where the users access and download available on line data. Data push This is the data delivery mode where the data is sent to the user without the need for any specific action by the users. Housekeeping data: Data generated by the payload and the platform for monitoring their own operational status. Mission The expression mission or space mission is used to cover the operations the satellite over the complete lifetime. It should not be confused with the observation missions, defined by EUMETSAT and GMES (for Sentinel- 5), as the end-to-end process generation level-2 data for operational purposes. Mode A mode is defined as an operationally significant and stable configuration. A stinction may be made between platform modes and payload modes. Depenng their nature, transitions between modes will be controlled autonomously or by ground command. Operational system System able to provide a service in a routine, long term and continuous fashion with a consistent quality and a very high level availability Outage The period time during which the service is not available with service recovered at the end the outage. This period shall include an allowance for the time taken for the spacecraft to become visible to the TT&C station. It shall also include an allowance for response from the ground Reliability The probability that the spacecraft will carry out its specified mission for the specified period. For specific observation missions, instrument reliability covers the instrument itself and all on-board elements needed to support the instrument, inclung the satellite data chain and downlink transmission Satellite in-orbit lifetime Period time between the beginning the in-orbit commissioning and the end the delivery data by the satellite. Single-point failure A single failure, which causes the service to be permanently scontinued. This can be a hardware failure or an irrecoverable stware error Subscription Request for the long term routine and automatic delivery specific data. Subscription definition could be by product type, data range, geographical region and adtional constrains, e.g. NRT or STC services Systematic acquisition Continuous and uniform operation the instrumentation to allow carpet like uninterrupted acquisition Timeliness For information only. Timeliness is the temporal span between data acquisition and availability the relevant level 2 products by the users.

19 19 21/07/ TERMS AND DEFINITIONS RELATED TO METOP-SG POINTING, VIEWING, REVISIT AND COVERAGE REQUIREMENTS Across-track rection Direction perpencular to the sub-satellite track and tangent to the geoid. Along-track rection Direction along the sub-satellite track. Coverage The (geometrical) coverage is the geographical area systematically acquired, sregarng cloud cover, sun glint and OZA contions. Effective Accessibility time The effective accessibility time represents the temporal frequency potential (non systematic) acquisition a given area with cloud cover (exclung thin cirrus if thin cirrus clouds can be detected and their effect corrected) and sun-glint below a specified threshold and possibly under fferent observation contions (in particular varying OZA or SZA). Effective Coverage time The effective coverage time represents the temporal frequency systematic acquisition a given area with cloud cover (exclung thin cirrus if thin cirrus clouds can be detected and their effect corrected) below a specified threshold and possibly under fferent observation contions (in particular varying OZA or SZA). Effective Revisit time The effective revisit time represents the temporal frequency systematic acquisition a given area with cloud cover (exclung thin cirrus if thin cirrus clouds can be detected and their effect corrected) below a specified threshold and under the same observation contions (in particular same OZA). Geodetic pointing Satellite pointing control to maintain the satellite pointed towards the normal to a geoid model and not to the centre the Earth. Geo-location knowledge Difference between the estimated position any spatial sample and its true position on the reference Earth geoid (TBC). Geometrical Accessibility time The geometrical accessibility time represents the temporal frequency potential (non systematic) acquisition a given area sregarng cloud cover and possibly under fferent observation contions (in particular varying OZA or SZA). Geometrical Revisit time The geometrical revisit time represents the temporal frequency systematic acquisition a given area sregarng cloud cover and under the same observation contions (in particular same OZA). Instrument co-registration knowledge Uncertainty on the fference between the positions closest spatial samples two instruments on the same METOP-SG spacecraft. Nar Geocentric nar is defined as the line from the centre the satellite to the centre the Earth. Geodetic nar is defined as the line from the centre the satellite to the perpencular the reference ellipsoid tangent. When not specifically identified, nar will refer to the geodetic nar.

20 21/07/14 Observation Zenith Angle (OZA) Angle between the satellite viewing rection and the local zenith defined in the target reference frame (i.e., zenith target satellite). Phase Angle Angle between the sun rection and the satellite viewing rection in the target reference frame (i.e., sun target satellite). (Satellite) Pointing accuracy The deviation the actual pointing vector from the commanded pointing vector. Pointing knowledge Pointing knowledge is the fference between the actual pointing vector and the measured/estimated pointing vector at any instant. Principal Plane Plane defined by the local zenith and the sun rection. Repeat Cycle The Repeat Cycle represents the time interval acquisition a given area sregarng cloud cover and possibly under fferent observation contions (in particular varying OZA or SZA). Scattering Angle Scattering Angle = π-phase Angle. Sub-Satellite Point (SSP) The sub-satellite point (SSP) is the point on the Earth s surface that intersects the geodetic or geocentric nar. Sub-Satellite Track (SST) Intersection the orbital plane with earth s geoid surface. Sun Zenith Angle (SZA) Angle between the sun rection and the local zenith defined in the target reference frame (i.e., zenith target sun). Yaw steering Satellite attitude pointing control (mainly) in the yaw rection to compensate the image stortion and misregistrations generated by the velocity the ground induced by the rotation the Earth.