metop-sg mwi - emits invitation to tender...

Questo documento contiene informazioni di proprietà di CGS SpA, Airbus Defence and Space SAS e Space Engineering SpA. Tutti i diritti sono riservati All information contained in this document is property of CGS SpA, Airbus Defence and Space SAS and Space Engineering SpA. All rights reserved

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

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

pmalusardi

Casella di testo

x

MetOp-SG MWI N° Doc: Doc N°:

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LIST OF ACRONYMS AND ABBREVIATIONS Pagina Page

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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

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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.

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