BS ISO 12208-2015 Space systems Space environment (natural and artificial) Observed proton fluences over long duration at GEO and guidelines for selection of confidence level in st.pdf
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1、BSI Standards PublicationBS ISO 12208:2015Space systems Spaceenvironment (natural andartificial) Observed protonfluences over long durationat GEO and guidelines forselection of confidence levelin statistical model of solarproton fluencesBS ISO 12208:2015 BRITISH STANDARDNational forewordThis British
2、 Standard is the UK implementation of ISO 12208:2015. It supersedes DD ISO/TS 12208:2011 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee ACE/68, Space systems and operations.A list of organizations represented on this committee can be obtained on reque
3、st to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 89355 1 ICS 49.140 Compliance with a British St
4、andard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 December 2015.Amendments/issued since publicationDate T e x t a f f e c t e dBS ISO 12208:2015 ISO 2015Space systems Space environment (na
5、tural and artificial) Observed proton fluences over long duration at GEO and guidelines for selection of confidence level in statistical model of solar proton fluencesSystmes spatiaux Environnement spatial (naturel et artificiel) Fluences de protons observes sur une longue dure au GEO et lignes dire
6、ctrices pour la slection du niveau de confiance dans le modle statistique des fluences de protons solairesINTERNATIONAL STANDARDISO12208First edition2015-10-01Reference numberISO 12208:2015(E)BS ISO 12208:2015ISO 12208:2015(E)ii ISO 2015 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2015, Publ
7、ished in SwitzerlandAll rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permiss
8、ion can be requested from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 12208:2015ISO 12208:2015(E)Forewo
9、rd ivIntroduction v1 Scope . 12 Terms and definitions . 13 Symbols and abbreviated terms . 24 Principles of the method (see Reference 3) 24.1 Cumulative fluence 24.2 Confidence level . 34.3 Archives of observed energetic protons in GEO . 34.4 Remarks 35 Guidelines for selection of a confidence level
10、 in a statistical model of solar proton fluences 4Annex A (informative) Example of estimation and selection 5Bibliography 9 ISO 2015 All rights reserved iiiContents PageBS ISO 12208:2015ISO 12208:2015(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of nat
11、ional standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. Interna
12、tional organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. The procedures used to develop this document and those inten
13、ded for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.
14、iso.org/directives). Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document w
15、ill be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents). Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement. For an explanation on the meaning of ISO specific terms and expr
16、essions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 20, Aircraft and space vehicles, Subco
17、mmittee SC 14, Space systems and operations.This first edition of ISO 12208 cancels and replaces ISO/TS 12208:2011.iv ISO 2015 All rights reservedBS ISO 12208:2015ISO 12208:2015(E)IntroductionThis International Standard is intended for use in the engineering community.It is well known that solar ene
18、rgetic protons (SEPs) damage spacecraft systems, i.e. electronics and solar cells, through ionization and/or atomic displacement processes. This results in single-event upsets and latch-ups in electronics, and output degradation of solar cells.Solar cells of spacecraft are obviously one of the key c
19、omponents of spacecraft systems. Degradation of solar cells by energetic protons is unavoidable and causes power loss in spacecraft systems. Estimation of cell degradation is crucial to the spacecrafts long mission life in geosynchronous earth orbit (GEO). Therefore, an estimation of SEP fluences in
20、 GEO is needed when designing solar cell panels.Solar cell engineers use a statistical model, the jet propulsion laboratory (JPL) fluence model for example, for estimating solar cell degradation. However, with regard to solar cell degradation, a statistical model predicts higher SEP fluences than th
21、e values actually experienced by spacecraft in GEO, especially seven years after the launch. Nowadays, spacecraft manufacturers are very conscious of minimum cost design of spacecraft because the lifetime of spacecraft is becoming longer (15 years to 18 years) and the cost of manufacturing spacecraf
22、t is increasing. Therefore, the aerospace industry requires a more accurate SEP fluence model for a more realistic design of solar cells. ISO 2015 All rights reserved vBS ISO 12208:2015BS ISO 12208:2015Space systems Space environment (natural and artificial) Observed proton fluences over long durati
23、on at GEO and guidelines for selection of confidence level in statistical model of solar proton fluences1 ScopeThis International Standard describes a method to estimate energetic proton fluences in geosynchronous earth orbit (GEO) over a long duration (beyond the 11-year solar cycle), and presents
24、guidelines for the selection of a confidence level in a model of solar proton fluences to estimate solar cell degradation.Many of the proton data observed in GEO are archived, for example from GMS (Japan), METEOSAT (ESA) and GOES (USA). This method is a direct integration of these fluence data (or t
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