1、BSI Standards PublicationBS ISO 22642:2015Space data and informationtransfer systems TCsynchronization and channelcodingBS ISO 22642:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 22642:2015. It supersedes BS ISO 22642:2005 which is withdrawn.The UK parti
2、cipation 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 request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are r
3、esponsible for its correct application. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 89745 0 ICS 49.140 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Stan
4、dards Policy and Strategy Committee on 31 December 2015.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dBS ISO 22642:2015Reference numberISO 22642:2015(E)ISO 2015INTERNATIONAL STANDARD ISO22642Second edition2015-11-15Space data and information transfer systems TC synchroniz
5、ation and channel coding Systmes de transfert des donnes et informations spatiales Synchronisation TC et codage de canal BS ISO 22642:2015ISO 22642:2015(E) COPYRIGHT PROTECTED DOCUMENT ISO 2015 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized
6、 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. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright o
7、ffice Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2015 All rights reservedBS ISO 22642:2015ISO 22642:2015(E) ISO 2015 All rights reserved iiiForeword ISO (the International Organization for Sta
8、ndardization) is a worldwide federation of national 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 righ
9、t to be represented on that committee. International 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. International
10、Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an
11、 International Standard requires approval by at least 75 % of the member bodies casting a vote. 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. This
12、International Standard cancels and replaces ISO 22642:2005 which has been technically revised. It also incorporates ISO 22642:2005/Cor.1:1997. ISO 22642 was prepared by the Consultative Committee for Space Data Systems (CCSDS) (as CCSDS 231.0-B-2, September 2010) and was adopted (without modificatio
13、ns except those stated in clause 2 of this International Standard) by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee SC 13, Space data and information transfer systems. BS ISO 22642:2015BS ISO 22642:2015Recommendation for Space Data System Standards TC SYNCHRONIZATION AND C
14、HANNEL CODING RECOMMENDED STANDARD CCSDS 231.0-B-2 BLUE BOOK September 2010 BS ISO 22642:2015AUTHORITY Issue: Recommended Standard, Issue 2 Date: September 2010 Location: This document has been approved for publication by the Management Council of the Consultative Committee for Space Data Systems (C
15、CSDS) and represents the consensus technical agreement of the participating CCSDS Member Agencies. The procedure for review and authorization of CCSDS documents is detailed in the Procedures Manual for the Consultative Committee for Space Data Systems, and the record of Agency participation in the a
16、uthorization of this document can be obtained from the CCSDS Secretariat at the address below. This document is published and maintained by: CCSDS Secretariat Space Communications and Navigation Office, 7L70 Space Operations Mission Directorate NASA Headquarters Washington, DC 20546-0001, USA ISO 22
17、642:2015(E) ISO 2015 All rights reservedBS ISO 22642:2015STATEMENT OF INTENT The Consultative Committee for Space Data Systems (CCSDS) is an organization officially established by the management of its members. The Committee meets periodically to address data systems problems that are common to all
18、participants, and to formulate sound technical solutions to these problems. Inasmuch as participation in the CCSDS is completely voluntary, the results of Committee actions are termed Recommended Standards and are not considered binding on any Agency. This Recommended Standard is issued by, and repr
19、esents the consensus of, the CCSDS members. Endorsement of this Recommendation is entirely voluntary. Endorsement, however, indicates the following understandings: o Whenever a member establishes a CCSDS-related standard, this standard will be in accord with the relevant Recommended Standard. Establ
20、ishing such a standard does not preclude other provisions which a member may develop. o Whenever a member establishes a CCSDS-related standard, that member will provide other CCSDS members with the following information: - The standard itself. - The anticipated date of initial operational capability
21、. - The anticipated duration of operational service. o Specific service arrangements shall be made via memoranda of agreement. Neither this Recommended Standard nor any ensuing standard is a substitute for a memorandum of agreement. No later than five years from its date of issuance, this Recommende
22、d Standard will be reviewed by the CCSDS to determine whether it should: (1) remain in effect without change; (2) be changed to reflect the impact of new technologies, new requirements, or new directions; or (3) be retired or canceled. In those instances when a new version of a Recommended Standard
23、is issued, existing CCSDS-related member standards and implementations are not negated or deemed to be non-CCSDS compatible. It is the responsibility of each member to determine when such standards or implementations are to be modified. Each member is, however, strongly encouraged to direct planning
24、 for its new standards and implementations towards the later version of the Recommended Standard. ISO 22642:2015(E) ISO 2015 All rights reservedBS ISO 22642:2015FOREWORD This document is a technical Recommended Standard for use in developing synchronization and channel coding systems and has been pr
25、epared by the Consultative Committee for Space Data Systems (CCSDS). The synchronization and channel coding concept described herein is intended for missions that are cross-supported between Agencies of the CCSDS. This Recommended Standard establishes a common framework and provides a common basis f
26、or the synchronization and channel coding schemes to be used by space missions with the TC Space Data Link Protocol (reference 1) over ground-to-space and space-to-space communications links. This Recommended Standard was developed from an older CCSDS Recommended Standard (reference C2), which defin
27、es essentially the same schemes but in a slightly different context. This Recommended Standard does not change the major technical content defined in reference C2, but the presentation of the specification has been changed so that: a) these schemes can be used to transfer any data over any space lin
28、k in either direction; b) all CCSDS space link protocols are specified in a unified manner; c) the layered model matches the Open Systems Interconnection (OSI) Basic Reference Model (reference 2). Together with the change in presentation, a few technical specifications in reference C2 have been chan
29、ged in order to define all Space Data Link Protocols in a unified way. Also, some technical terms in reference C2 have been changed in order to unify the terminology used in all the CCSDS Recommended Standards that define space link protocols and to define these schemes as general communications sch
30、emes. These changes are listed in annex D of this Recommended Standard. Through the process of normal evolution, it is expected that expansion, deletion, or modification of this document may occur. This Recommended Standard is therefore subject to CCSDS document management and change control procedu
31、res, which are defined in the Procedures Manual for the Consultative Committee for Space Data Systems. Current versions of CCSDS documents are maintained at the CCSDS Web site: http:/www.ccsds.org/ Questions relating to the contents or status of this document should be addressed to the CCSDS Secreta
32、riat at the address indicated on page i. ISO 22642:2015(E) ISO 2015 All rights reservedBS ISO 22642:2015At time of publication, the active Member and Observer Agencies of the CCSDS were: Member Agencies Agenzia Spaziale Italiana (ASI)/Italy. Canadian Space Agency (CSA)/Canada. Centre National dEtude
33、s Spatiales (CNES)/France. China National Space Administration (CNSA)/Peoples Republic of China. Deutsches Zentrum fr Luft- und Raumfahrt e.V. (DLR)/Germany. European Space Agency (ESA)/Europe. Instituto Nacional de Pesquisas Espaciais (INPE)/Brazil. Japan Aerospace Exploration Agency (JAXA)/Japan.
34、National Aeronautics and Space Administration (NASA)/USA. Russian Federal Space Agency (RFSA)/Russian Federation. UK Space Agency/United Kingdom. Observer Agencies Austrian Space Agency (ASA)/Austria. Belgian Federal Science Policy Office (BFSPO)/Belgium. Central Research Institute of Machine Buildi
35、ng (TsNIIMash)/Russian Federation. China Satellite Launch and Tracking Control General, Beijing Institute of Tracking and Telecommunications Technology (CLTC/BITTT)/China. Chinese Academy of Sciences (CAS)/China. Chinese Academy of Space Technology (CAST)/China. Commonwealth Scientific and Industria
36、l Research Organization (CSIRO)/Australia. CSIR Satellite Applications Centre (CSIR)/Republic of South Africa. Danish National Space Center (DNSC)/Denmark. Departamento de Cincia e Tecnologia Aeroespacial (DCTA)/Brazil. European Organization for the Exploitation of Meteorological Satellites (EUMETSA
37、T)/Europe. European Telecommunications Satellite Organization (EUTELSAT)/Europe. Geo-Informatics and Space Technology Development Agency (GISTDA)/Thailand. Hellenic National Space Committee (HNSC)/Greece. Indian Space Research Organization (ISRO)/India. Institute of Space Research (IKI)/Russian Fede
38、ration. KFKI Research Institute for Particle b) data formats; and c)It does not specify: a) individual implementations or products; b) the methods or technologies required to perform the procedures; or c) the management activities required to configure and control the system. 1.3 APPLICABILITY This
39、Recommended Standard applies to the creation of Agency standards and to the future data communications over space links between CCSDS Agencies in cross-support situations. This Recommended Standard includes comprehensive specification of the data formats and procedures for inter-Agency cross support
40、. It is neither a specification of, nor a design for, real systems that may be implemented for existing or future missions. The Recommended Standard specified in this document is to be invoked through the normal standards programs of each CCSDS Agency, and is applicable to those missions for which c
41、ross support, based on capabilities described in this Recommended Standard, is anticipated. Where mandatory capabilities are clearly indicated in sections of this Recommended Standard, they must be implemented when this document is used as a basis for cross support. Where options are allowed or impl
42、ied, implementation of these options is subject to specific bilateral cross support agreements between the Agencies involved. ISO 22642:2015(E) ISO 2015 All rights reservedBS ISO 22642:20151.4 RATIONALE The CCSDS believes it is important to document the rationale underlying the recommendations chose
43、n, so that future evaluations of proposed changes or improvements will not lose sight of previous decisions. 1.5 DOCUMENT STRUCTURE This document is divided into seven numbered sections and four annexes: a) section 1 presents the purpose, scope, applicability and rationale of this Recommended Standa
44、rd and lists the conventions, definitions, and references used throughout the Recommended Standard; b) section 2 provides an overview of synchronization and channel coding; c) section 3 specifies the Bose-Chaudhuri-Hocquenghem (BCH) coding; d) section 4 specifies the Communications Link Transmission
45、 Unit (CLTU); e) section 5 specifies the randomizer; f) section 6 specifies the Physical Layer Operations Procedures (PLOPs); g) section 7 lists the managed parameters associated with synchronization and channel coding; h) annex A defines the service provided to the users; i) annex B lists acronyms
46、and terms used within this document; j) annex C provides a list of informative references; k) D lists the changes from the older CCSDS Recommended Standard (reference C2). 1.6 CONVENTIONS AND DEFINITIONS 1.6.1 DEFINITIONS 1.6.1.1 Definitions from the Open Systems Interconnection (OSI) Basic Referenc
47、e Model This Recommended Standard makes use of a number of terms defined in reference 2. The use of those terms in this Recommended Standard shall be understood in a generic sense; i.e., in the sense that those terms are generally applicable to any of a variety of technologies that provide for the e
48、xchange of information between real systems. Those terms are as follows: a) Data Link Layer; ISO 22642:2015(E) ISO 2015 All rights reservedBS ISO 22642:2015b) Physical Layer; c) service; d) service data unit. 1.6.1.2 Definitions from OSI Service Definition Conventions This Recommended Standard makes
49、 use of a number of terms defined in reference 3. The use of those terms in this Recommended Standard shall be understood in a generic sense; i.e., in the sense that those terms are generally applicable to any of a variety of technologies that provide for the exchange of information between real systems. Those terms are as follows: a) indication; b) primitive; c) request; d) service provider; e) service user. 1.6.1.3 Terms Defined in This Recommended Standard For the purpos
