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MetOp-SG MWI
Tipo Doc.: Doc.Type:
LIST N° DRD: DRD N°:
MWI-PM-30
N° Doc.: Doc. N°: MOS-LI-CGS-MWI-0001
Ediz.: Issue: 02
Data: Date: 21/07/2014
Pagina Page 1
Di Of 20
Titolo : Title :
LIST OF ACRONYMS AND ABBREVIATIONS
Nome & Funzione Name & Function
Firma Signature
Data Date
LISTA DI DISTRIBUZIONE DISTRIBUTION LIST N A I
Preparato da: Prepared by:
MWI Team Interna / Internal
Approvato da: Approved by:
T. Lupi (CGS-SE)
L. Cremonesi (CGS-PA)
C. Cinquepalmi (CGS-CC)
Applicazione autorizzata da: Application authorized by:
A. Sacchetti (CGS-PM) Esterna / External
Customer / Higher Level Contractor
Accettato da: Accepted by:
Approvato da: Approved by:
N=Numero di copie A=Applicazione I=Informazione N=Number of copy A=Application I=Information
Gestione documenti: Data Management:
Firma / Signature Data / Date File: MOS-LI-CGS-MWI-0001_v2 List of Acronyms and abbreviation
22/07/2014
22/07/2014
22/07/2014
22/07/2014
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REGISTRAZIONE DELLE MODIFICHE / CHANGE RECORD
EDIZIONE ISSUE
DATA DATE
AUTORIZZAZIONE CHANGE AUTHORITY
OGGETTO DELLA MODIFICA E SEZIONI AFFETTE REASON FOR CHANGE AND AFFECTED SECTIONS
01 19/10/2012 First Issue for Proposal
02 21/07/2014 Second Issue for SSR
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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
1 - 20 01
1 – 20 02
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TABLE OF CONTENTS
1. INTRODUCTION AND SCOPE ............................................................................................................................ 5
2. DOCUMENTS ....................................................................................................................................................... 6
2.1 APPLICABLE DOCUMENTS ........................................................................................................................ 6
3. LIST OF ACRONYMS AND ABBREVIATIONS .................................................................................................. 7
4. LIST OF DEFINITIONS ...................................................................................................................................... 14
4.1 GENERAL TERMS AND DEFINITIONS OF MWI ....................................................................................... 14 4.2 TERMS AND DEFINITIONS RELATED TO MWI RELIABILITY REQUIREMENTS................................... 16 4.3 TERMS AND DEFINITIONS RELATED TO THE EPS-SG SYSTEM AND ITS DECOMPOSITION INTO LOWER LEVELS .................................................................................................................................................... 16 4.4 TERMS AND DEFINITIONS RELATED TO THE METOP-SG DATA PRODUCTS ................................... 17 4.5 TERMS AND DEFINITIONS RELATED TO METOP-SG POINTING, VIEWING, REVISIT AND COVERAGE REQUIREMENTS ............................................................................................................................. 19
LIST OF TABLES Table 2-1: Applicable documents ................................................................................................................................ 6
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1. INTRODUCTION AND SCOPE
The present document, referenced as MWI-PM-30 according to the document list reference (DLR), includes the list of acronyms, abbreviations and definitions used in the submitted proposal, S12-059 Issue 1, for MetOp-SG MicroWave Imager (MWI).
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2. DOCUMENTS
2.1 APPLICABLE DOCUMENTS
AD Doc. No. Issue/
Rev. Title
AD01 Reserved
AD02 Reserved
AD03 Reserved
AD04 MOS-SOW-ADS-SATB-0579 1.1 Statement Of Work for the MicroWave Imager [SOW-MWI]
AD05 Reserved
AD06 Reserved
AD07 Reserved
AD08 Reserved
AD09 MOS-SP-ADS-SATB-0580 1.4 Technical Requirements Specification for the MicroWave Imager Instrument [TRS-MWI]
AD10 Reserved
AD11 Reserved
AD12 Reserved
AD13a MOS-SP-ASF-SYS-00816 1.1 MetOp-SG Instrument General Design and Interface Requirements [INS-GDIR]
AD13b MOS-SP-ASF-SYS-00349 2.2 MetOp-SG Units General Design and Interface Requirements [Units GDIR]
AD13c ENS-06-00123-ASTR 8.0 General Design and Interfaces Requirements [Generic GDIR]
AD14 MOS-RS-ESA-INS-0434 1.0 MetOp-SG Instruments Product Assurance and Safety Requirements [PARD]
AD14b MOS-SP-ASF-SYS-00401 1.0 MetOp-SG Product Assurance Requirements for Suppliers
AD14c MOS-SP-ASF-SYS-00402 1.0 MetOp-SG Software Product Assurance Requirements for Suppliers
AD15 MOS-RS-ESA-INS-0435 1.0 MetOp-SG Instruments Project Management Requirements [MARD]
AD16 MOS-LI-ESA-SYS-0067 1.1 MetOp-SG Deliverable Items and Services List [DISL]
AD17 MOS-LI-ESA-INS-0436 1.0 MetOp-SG Instruments Document Requirements List [DRL]
AD18 MOS-LI-ESA-INS-0437 1.0 MetOp-SG Instruments Document Requirements Definition [DRD]
AD19 MOS-RS-ESA-INS-0438 1.0 MetOp-SG Instruments Tailoring Of ECSS-E Standards
AD20 MOS-RS-ESA-ENV-0023 1.0 MetOp-SG Environmental Specification
AD21 MOS-HB-ESA-INS-0443 1 MetOp Second Generation Instruments - Phases B2, C/D and Support to Phase E - Subcontractor Selection Procedure and Tender Evaluation Handbook
AD22 MOS-RS-ESA-SYS-0433 1.0 MetOp-SG Space Segment General Design and Interfaces Requirements [GDIR]
AD23 MOS-RS-ESA-MWI-0429 1.0 Instrument Requirements Specification for the MicroWave Imager [IRS-MWI]
Table 2-1: Applicable documents
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3. LIST OF ACRONYMS AND ABBREVIATIONS
Acronym/Abbreviation Meaning
3MI Multi-viewing, Multi-channel, Multi-polarization Imager
ABCL As Built Configuration List
ACST Advanced Compound Semiconductor Technologies GmbH AD Applicable Document
ADC Analog to Digital Converter
ADS Airbus Defence & Space
AIT Assembly, Integration and Test
AIV Assembly, Integration and Verification
AKE Absolute Knowledge Error AME Absolute Measurement Error
AMSR Advanced Microwave Scanning Radiometer
AOCS Attitude and Orbit Control Subsystem
APE Absolute Pointing Error
APID APplication IDentifier
AR Acceptance Review
ASF Astrium SAS France
ASIC Application Specific Integrated Circuit
ATBD Algorithm Theoretical Baseline Document
ATMS Advanced Technology Microwave Sounder
BB BreadBoard
BE Back End
BI Image Bias
BOL Beginning Of Life
BRC Basic Repeat Cycle
BS Satellite Bias
CA Calibration Assembly
CAD Computer Aided Design
CAM Collision Avoidance Manoeuvre
CIDL Configuration Item Data List
CCN Contract Change Notice
CCR Compensated Compact Range
CDR Critical Design Review
CDPU Control and Data Processing Unit
CETeF Coordinated European Test Facilities
CEOS Committee on Earth Observation Satellites
CFI Customer-Furnished Instrument
CFRP Carbon Fiber Reinforced Plastic
CIDL Configuration Item Data List
CNES Centre National d’Etudes Spatiales
CGS CGS S.p.A. - Compagnia Generale per lo Spazio
CLS Collect Localisation Satellites
CNR-ISAC Consiglio Nazionale delle Ricerche – Istituto di Scienze Atmosferiche e del Clima (Institute of Atmospheric Sciences and Climate of the Italian National Research Council)
CoG Centre of Gravity
COM COmmissioning Phase
COTS Commercial Off-The-Shelf CP Ceiling Price
CPI Contractor Provided Instrument
CPP Centralized Parts Procurement
CPPA Centralized Parts Procurement Agent
CR Cost Reimbursement
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DC Duty Cycle
DCL Declared Component List
DCS Data Collection Service
DISL Deliverable Items and Service List
DD Direct Detection
DDBS Direct Data Broadcast Service
DDV Design, Development and Verification
DDR Detailed Design Review
DEM Digital Elevation Model
DHS Data Handling Subsystem
DISL Deliverable Items and Services List DLR Deutsches Zentrum für Luft und Raumfahrt
DM Development Model
DML Declared Material List
DoCon Down Converter
DPL Declared Process List
DPM Detailed Processing Model
DRD Document Requirements Definition
DRL Document Requirements List
DRO Dieletric Resonant Oscillator
DSB Double Side Band
DVD Digital Versatile Disc
ECMWF European Centre for Medium-range Weather Forecasts
ECP Engineering Change Proposal
ECSS European Cooperation for Space Standardization
EEE Electrical, Electronic and Electro-Mechanical
EFM Electrical Functional Model
EGSE Electrical Ground Support Equipment
EIRP Equivalent Isotropically Radiated Power
EM Engineering Model
EMC Electro-Magnetic Compatibility
EOL End Of Life
EPS EUMETSAT Polar System
EPS-SG EUMETSAT Polar System-Second Generation
EPSS Electrical Power Supply Subsystem
EQM Engineering Qualification Model
EQSR Engineering Qualification Status Review
ES Environment Simulator
ESA European Space Agency
ESM Emergency and Safe Mode
ESTL European Space Tribology Laboratories
EUMETSAT European Organization for the Exploitation of Meteorological Satellites
EVA Extreme Value Analysis
EVDB Engineering Verification Data Base
FAR Flight Acceptance Review
FAR False Alarm Rate
FDIR Failure Detection Isolation and Recovery
FE Front-End
FEE Front-End Electronics
FEM Finite Element Model/Method
FESA Front-End Sub-Assembly
FFT Fast Fourier Transform
FFP Firm Fixed Price
FM Flight Model
FMECA Failure Modes, Effects & Criticality Analysis
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FOV Field Of View
FOM Flight Operations Manual
FP (Firm) Fixed Price
FPA Focal Plane Assembly
FPGA Field Programmable Gate Array
FPV Fixed Price with Variation
FS Flight Spare
FSS Frequency Selective Surface
FWHM Full Width Half Maximum
GCP Ground Control Point
GDDS Global Data Distribution Service
GDIR General Design and Interface Requirements
GMF Geophysical Model Function
GMI GPM Microwave Imager
GMM Geometrical Mathematical Model
GN2 Gaseous Nitrogen
GNSS Global Navigation Satellite System
GPHA Gaussian Profiled Horn Antenna
GPIB General Purpose Interface Bus
GPP Ground Processor Prototype
GS Ground Segment
GS-5 Gmes Sentinel-5
GSE Ground Support Equipment
GSM Ground Scan Mechanism GWF Geophysical Model Function
H Horizontal polarisation
H/W HardWare
H&V Horizontal & Vertical
HD Heterodyne Detection
HH Transmission in horizontal polarisation and reception in horizontal polarisation
HF High Frequency
HKTM House-Keeping TeleMetry
HPA High Power Amplifier
HPBW Half Power Beam Width
HRPT High Resolution Picture Transmissions
HV Horizontal-Vertical Polarization
HW HardWare
I/F InterFace
I/O Input/Output
IAF Fraunhofer Institute for Applied Solid-State Physics
IASI-NG Infrared Atmospheric Sounder – New Generation
IASW Instrument Application SoftWare
ICD Interface Control Document
ICI Ice Could Imager
ICU Instrument Control Unit
IDS Instrument Data Simulator
INR Interface to Noise Ratio
IOAP Initial Orbit Acquisition Phase
IOCP In-Orbit Commissioning Phase
IR Infra-Red
IRD Interface Requirements Document
IRDB Instrument Reference Data Base
IRF Impulse Response Function
IRS Instrument Requirements Specification
ISLR Integrated Side Lobe Ratio
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ISS International Space Station
ISVV Independent Software Verification and Validation
ITT Invitation To Tender
ITU International Telecommunications Union
JPL Jet Propulsion Laboratories
KBF K-Band Feed
KIP Key Inspection Point
KO Kick-Off
LAN Local Area Network
LEO Low Earth Orbit
LEOP Launch and Early Orbit Phase
LF Low Frequency
LLD Launch Locking Device
LLI Long Lead Items
LLRS Low Level Resonance Search
LN2 Liquid Nitrogen
LNA Low Noise Amplifier
LO Local Oscillator
LSB Least Significant Bit
LSB Lower Side band
LTM Life Test Model
M&C Monitoring & Command
MADRAS Microwave Analysis and Detection of Rain and Atmospheric Systems
MAIT Manufacturing, Assembly, Integration and Test
MARD MAnagement Requirements Document
MCA Monte Carlo Analysis
MCS Mission Control System
METimage Visible and infrared imager for meteorological observations
MetOp Meteorological Operational
MetOp-SG MetOp-Second Generation
MGSE Mechanical Ground Support Equipment
MHEMT Metamorphic High Electron Mobility Transistor
MHS Microwave Humidity Sounder
MICD Mechanical Interface Control Document
MIER MIER Comunicaciones SA
MIP Mandatory Inspection Point
MLI Multi Layer Insulation
MMI Man Machine Interface
MMIC Monolithic Microwave Integrated Circuit
MOS MetOp Second generation
MPM Microwave Power Module
MRB Material Review Board
MRD Mission Requirements Document
MTF Modulation Transfer Function
MTP Master Test Processor
MTR Mid Term Review
MWI MicroWave Imager
MWS MicroWave Sounder
NA Not Applicable
NCR Non-Conformance Report
NEA Non Explosive Actuator
NEDL Noise Equivalent Differential Radiance
NEΔT Noise Equivalent Differential Temperature
NEDT Noise Equivalent Differential Temperature
NF Noise Figure
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NIR Near Infra-Red
NOAA National Oceanic and Atmospheric Administration
NOM Nominal Phase
NRB Non-conformance Review Board
OAT Orbit, Attitude and Time
OBA On Board Angle
OBAM On Board Algorithm Model
OBCP On Board Control Procedure
OBCT On Board Calibration Target
OBSW On Board SoftWare
OGSE Optical Ground Support Equipment
OHB Orbital- und Hydrotechnologie Bremen-System GmbH
OIRD Operations Interface Requirements Document
OMT Ortho Mode Transducer
OSS Observing System Simulator
OTS Off The Shelf
OZA Observation Zenith Angle
PA Product Assurance
PARD Product Assurance Requirements Document
PBL Planetary Boundary Layer
PC Personal Computer
PCB Printed Circuit Board
PCR Preliminary Concept Review
PD Probability of Detection
PDF Probabilistic Distribution Function
PDHT Payload Data Handling and Transfer
PDR Preliminary Design Review
PDTD Power and Data Transfer Device
PEPS Post-EPS
PFB Polyphase Filter Bank
PFM Proto-Flight Model
PLUTO Procedure Language for Users in Test and Operations
PMP Parts, Material and Processes
PMS Polarisation Measurement System
PO Physical Optics
POD Precise Orbit Determination
PRF Pulse Repetition Frequency
PRR Preliminary Requirements Review
PSA Part Stress Analysis
PSF Point Spread Function
PSLR Peak Side-Lobe Ratio
PSR Pre Storage Review
PWR Power
PUS Packet Utilization Standard
QLTM Qualification Models Life Time
QM Qualification Model
QR Qualification Review
QSL Quasi Static Load factor
R&D Research and Development
RAL Rutherford Appleton Laboratory
RAM Random Access Memory
RAMS Reliability, Availability, Maintainability and Safety
RAT Rotation Angle Trigger
RD Reference Document
RER Radiation Energy Radiometer
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RF Radio Frequency
RFA Radio Frequency Assembly
RFC Radio Frequency Compatibility
RFD Request For Deviation
RF GSE Radio Frequency Ground Support Equipment
RFI Request For Interest
RFI Radio Frequency Interference
RFI mitigation Radio Frequency Interference mitigation
RFP Request For Proposal
RFQ Request For Quotation
RFW Request For Waiver
RKE Relative Knowledge Error
RMS Root Mean Square
RO Radio Occultation sounder
ROM Rough Order of Magnitude
ROM Read Only memory
RP Rotating Positioner
RPE Relative Pointing Error
RPG Radiometer Physics GmbH
RPM Rate Per Minute
RSS Root Sum Squared
RX Receiver
S5 Sentinel-5 instrument
S/C SpaceCraft
S/W SoftWare
SAF Satellite Application Facility
SAR Search And Rescue
SAT Start of Acquisition Trigger
SATSIM SATellite SIMulator
S/C SpaceCraft
SCA SCAtterometer
SCE SCan Electronics
SCDB Satellite Characterisation Data Base
SCOT Special Conditions Of Tender
SCM SCan Mechanism
SDE Software Development Environment
SDVE Software Development and Validation Environment
SEL Single Event Latch-up
SEM Space Environment Monitor
SEU Single Event Upset
SHP Sub-Harmonically Pumped
SIGIRD Space-to Ground Interfaces Requirements Document
SI Système International of units
SIOV Satellite In-Orbit Verification
SIOVR Satellite In-Orbit Verification Review
SNR Signal to Noise Ratio
SPF Single Point Failure
SODAP Switch-On and Data Acquisition Phase
SOW Statement Of Work
SpEng Space Engineering S.p.A.
SPG Space Engineering S.p.A.
SRD System Requirement Document
SRDB Satellite Reference Data Base
SRR System Requirements Review
SSA Spatial Sampling Angle
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SSD Spatial Sampling Distance
SSM Second Surface Mirror
SSMI Special Sensor Microwave Imager
SSO Sun Synchronous Orbit
SSP Sub-Satellite Point
SSRD Space Segment Requirements Document
SSST Single Space Segment Team
STM Structural and Thermal Model
STR Star Tracker
SVF Software Validation Facility
SVT Software Validation Test
SW SoftWare
SWE Snow Water Equivalent
SWIR Short Wave Infra-Red
SZA Sun-Zenith Angle
TAR Total Ambiguity Ratio
TBC To Be Confirmed
TBD To Be Determined/Defined
TC TeleCommand
TCS Thermal Control System
TCSS Thermal Control Sub-System
TICD Thermal Interface Control Document
TIR Thermal Infra-Red
TM TeleMetry
TMM Thermal Mathematical Model
TM/TC TeleMetry and TeleCommand
TMTC TeleMetry and TeleCommand
TOA Top Of Atmosphere
TOPE Test Operation Procedure Environment
TRB Test Review Board
TRL Technology Readiness Level
TRR Test Readiness Review
TT&C Telemetry, Tracking and Command
UART Universal Asynchronous Receiver and Transmitter
UHM Ultra High Modulus
UML Universal Modelling Language
USB Upper Side Band
UTC Universal Time Counter
UTM Universal Transverse Mercator
UV Ultra-Violet
V Vertical polarisation
VCD Verification Control Document
VDA Vacuum Deposite Aluminium
VH Vertical-Horizontal Polarization
VIS Visible
VM Virtual Machine
VNIR Visible and Near Infra-Red
VV Transmission in vertical polarisation and reception in vertical polarisation
WBS Work Breakdown structure
WCA Worst Case Analysis
WGS84 World Geodetic System, 1984 version
WPD Work Package Description
YSM Yaw Steering Mode
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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, including 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 of single element or multiple “sub-channels”. Channel Bandwidth Half-power point bandwidth. Channel shape The spectral response of the instrument over a defined range of frequency(ies). Channel shape refers to the overall response of the instrument (from the antenna aperture to the instrument output). Dynamic range Range of brightness temperatures within which requirements are to be met. Effective field of View (EFOV) Effective area swept by the antenna beam during the integration time. Footprint The area is defined by the instantaneous intersection of 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 of the two axes. Frequency Stability Maximum difference between the real frequency and the actual frequency assigned. Gain See system gain. Half Power Beamwidth (HPBW) Angle at which the antenna's power radiation pattern is at half its maximum value. Horizontal Polarisation (H) Electric field is perpendicular to the plane of incidence. Instantaneous Field of View (IFOV) See definition on footprint. Kurtosis Algorithm The microwave radiometer amplitude power density function signal is Gaussian distributed. Kurtosis of k is given by a ration
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Where x(t) is the pre-detection signal and ⟨ ⟩ represents statistical expectation. For a gaussian distributed signal, the kurtosis is always equal to 3. Main Beam The main beam is defined as equal to 2.5 times the HPBW. Out-of-band rejection The minimum level of suppression of a signal outside of specified channel. Radiometric accuracy Difference between the result of a measurement and a true value of the measurement. Radiometric Sensitivity (NEΔT): Smallest change in input brightness temperature or radiance that can be detected in the system output for an integration time that is compliant with the sampling distance. The sensitivity requirement applies to calibrated radiances 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 (including 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 of calibration cycles averaged. Scene Temperature Earth Scene temperature of 280 K shall be used, assuming earth is a perfect blackbody. Spatial Sampling Distance (SSD) Distance between the centre of 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 of the instrument channel (from the antenna aperture to the instrument output). Vertical Polarisation (V) Electric field is parallel to the plane of 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 of 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 of broad-band noise such as thermal radiation.
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4.2 TERMS AND DEFINITIONS RELATED TO MWI RELIABILITY REQUIREMENTS
Failed Channel MWI channel is considered failed if any of the following requirements fall below requirement [R] value of the requirement: R-MWI-0130, R-MWI-0140, R-MWI-0150, RMWI-0220, R-MWI-0230, R-MWI-0240, R-MWI-0270, R-MWI-0280, R-MWI-0290, RMWI-0300, R-MWI-0320, R-MWI-0330, R-MWI-0350 AND R-MWI-1420. 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 of a single polarisation is considered as a loss of channel. Failed Instrument The complete MWI instrument is considered failed if one of below occurs: • Loss of more than one of channels among MWI-1, MWI-2 or MWI-3, • Loss of more than one of the channels among MWI-8 or MWI-14.
4.3 TERMS AND DEFINITIONS RELATED TO THE EPS-SG SYSTEM AND ITS DECOMPOSITION INTO LOWER LEVELS
The overall EPS-SG System is composed of the following levels of 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 of interdependent segments and/or elements constituted to achieve a given objective by performing together a specified function. In this document, System is used to indicate the highest level [Level 1] of logical decomposition, i.e. the overall EPS-SG System. Segments [Level 2] The physical or logical parts of the first level decomposition of the EPS-SG System, namely: the Space, Launcher, Ground and the Users and Services Segments. The EPS-SG Space Segment is composed of the MetOp-SG Satellite(s). Satellite or Spacecraft [Level 2 Space Segment] The terms satellite and spacecraft are used indifferently to refer to each of the independently flying Elements of the space segment. It comprises all hardware to be placed into low earth orbit with the exception of the launch vehicle. In turn, the satellite is composed of 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 understanding of how they work is necessary for the proper design of the functions to be fulfilled by the EPS-SG System, especially of its interfaces. Elements [Level 3] The physical or logical parts of the second level decomposition of the EPS-SG Segments [Level 2]. The Level 3 Elements of the Level 2 Space Segment are:
The platform of each satellite,
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The payload Instruments accommodated on each Satellite. Sub-Systems [Level 4] The physical or logical parts of the next level of decomposition of 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 of management or responsibility. Unit or Equipment [Level 5] The physical or logical parts of a Level 4 sub-system. User [part of 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 of 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, including the satellite data chain and the downlink transmission Ancillary data Data acquired on-board in support of the observation data, related to both payload and platform, such as calibration and timing data Consistency The quality that ensures that a given series of data has the same level of quality and it has all been processed according to the same set of standards. Consistency is important to ensure the long term coherence of quality needed by Climate Science Data level definitions The following CEOS compliant definitions of data level and products are used:
Observation Data Level 0 Raw observation data after restoration of 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 of all communication artefacts (e.g., synchronization frames, communications headers, duplicated data). Level 0 data are timetagged. The precision and accuracy of 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 of the chronological data sequence for the instrument(s) operating in calibration mode.
Observation Data Level 1a Level 0 data with corresponding radiometric and spectral correction and calibration computed and appended, but not applied, and possibly with preliminary geometric correction not altering the radiometry (i.e. integer shift).
Observation Data Level 1b Level 1a data not re-sampled, quality-controlled and radiometrically 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).
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Data driven This is the mode where the payload data processing, archiving and disseminating occurs as the data are received without requiring operators for checking that events are progressing according 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 of their own operational status. Mission The expression “mission” or “space mission” is used to cover the operations of 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 of generation of level-2 data for operational purposes. Mode A mode is defined as an operationally significant and stable configuration. A distinction may be made between platform modes and payload modes. Depending of 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 of availability Outage The period of time during which the service is not available with service recovered at the end of 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, including the satellite data chain and downlink transmission Satellite in-orbit lifetime Period of time between the beginning of the in-orbit commissioning and the end of the delivery of data by the satellite. Single-point failure A single failure, which causes the service to be permanently discontinued. This can be a hardware failure or an irrecoverable software error Subscription Request for the long term routine and automatic delivery of specific data. Subscription definition could be by product type, data range, geographical region and additional constrains, e.g. NRT or STC services Systematic acquisition Continuous and uniform operation of the instrumentation to allow carpet like uninterrupted acquisition Timeliness For information only. Timeliness is the temporal span between data acquisition and availability of the relevant level 2 products by the users.
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4.5 TERMS AND DEFINITIONS RELATED TO METOP-SG POINTING, VIEWING, REVISIT AND COVERAGE REQUIREMENTS
Across-track direction Direction perpendicular to the sub-satellite track and tangent to the geoid. Along-track direction Direction along the sub-satellite track. Coverage The (geometrical) coverage is the geographical area systematically acquired, disregarding cloud cover, sun glint and OZA conditions. Effective Accessibility time The effective accessibility time represents the temporal frequency of potential (non systematic) acquisition of a given area with cloud cover (excluding thin cirrus if thin cirrus clouds can be detected and their effect corrected) and sun-glint below a specified threshold and possibly under different observation conditions (in particular varying OZA or SZA). Effective Coverage time The effective coverage time represents the temporal frequency of systematic acquisition of a given area with cloud cover (excluding thin cirrus if thin cirrus clouds can be detected and their effect corrected) below a specified threshold and possibly under different observation conditions (in particular varying OZA or SZA). Effective Revisit time The effective revisit time represents the temporal frequency of systematic acquisition of a given area with cloud cover (excluding thin cirrus if thin cirrus clouds can be detected and their effect corrected) below a specified threshold and under the same observation conditions (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 of the Earth. Geo-location knowledge Difference between the estimated position of any spatial sample and its true position on the reference Earth geoid (TBC). Geometrical Accessibility time The geometrical accessibility time represents the temporal frequency of potential (non systematic) acquisition of a given area disregarding cloud cover and possibly under different observation conditions (in particular varying OZA or SZA). Geometrical Revisit time The geometrical revisit time represents the temporal frequency of systematic acquisition of a given area disregarding cloud cover and under the same observation conditions (in particular same OZA). Instrument co-registration knowledge Uncertainty on the difference between the positions of closest spatial samples of two instruments on the same METOP-SG spacecraft. Nadir Geocentric nadir is defined as the line from the centre of the satellite to the centre of the Earth. Geodetic nadir is defined as the line from the centre of the satellite to the perpendicular of the reference ellipsoid tangent. When not specifically identified, nadir will refer to the geodetic nadir.
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Observation Zenith Angle (OZA) Angle between the satellite viewing direction and the local zenith defined in the target reference frame (i.e., zenith – target – satellite). Phase Angle Angle between the sun direction and the satellite viewing direction in the target reference frame (i.e., sun – target – satellite). (Satellite) Pointing accuracy The deviation of the actual pointing vector from the commanded pointing vector. Pointing knowledge Pointing knowledge is the difference 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 direction. Repeat Cycle The Repeat Cycle represents the time interval of acquisition of a given area disregarding cloud cover and possibly under different observation conditions (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 nadir. Sub-Satellite Track (SST) Intersection of the orbital plane with earth’s geoid surface. Sun Zenith Angle (SZA) Angle between the sun direction 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 direction to compensate the image distortion and mis-registrations generated by the velocity of the ground induced by the rotation of the Earth.