1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 17214:2011Space data and informationtransfer systems Spacecraftonboard interface services Time access serviceBS ISO 17214:2011 BRITISH STANDARDNational forewordThis Britis
2、h Standard is the UK implementation of ISO 17214:2011.The UK participation in its preparation was entrusted to TechnicalCommittee ACE/68/-/7, Space systems and operations - Space dataand information transfer systems.A list of organizations represented on this committee can beobtained on request to i
3、ts secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2012ISBN 978 0 580 74857 8ICS 49.140Compliance with a British Standard cannot confer immunity fromlegal obligations
4、.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 January 2012.Amendments issued since publicationDate Text affectedBS ISO 17214:2011Reference numberISO 17214:2011(E)ISO 2011INTERNATIONAL STANDARD ISO17214First edition2011-12-15Space data an
5、d information transfer systems Spacecraft onboard interface services Time access service Systmes de transfert des informations et donnes spatiales Services dinterfaces bord des vhicules spatiaux Service daccs au temps BS ISO 17214:2011ISO 17214:2011(E) COPYRIGHT PROTECTED DOCUMENT ISO 2011 All right
6、s reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the
7、requester. ISO copyright office 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 2011 All rights reservedBS ISO 17214:2011ISO 17214:2011(E) ISO 2011 All rights reserved iiiForeword ISO (the Internat
8、ional Organization for Standardization) 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 bee
9、n established has the right 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 stand
10、ardization. International 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
11、 voting. Publication as an 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
12、 such patent rights. ISO 17214 was prepared by the Consultative Committee for Space Data Systems (CCSDS) (as CCSDS 872.0-M-1, January 2011) and was adopted (without modifications except those stated in Clause 2 of this International Standard) by Technical Committee ISO/TC 20, Aircraft and space vehi
13、cles, Subcommittee SC 13, Space data and information transfer systems. BS ISO 17214:2011BS ISO 17214:2011INTERNATIONAL STANDARD ISO 17214:2011(E) ISO 2011 All rights reserved 1Space data and information transfer systems Spacecraft onboard interface services Time access service 1 Scope This Internati
14、onal Standard defines services and service interfaces provided by the Spacecraft Onboard Interface Services (SOIS) time access service. It specifies only the service and not the methods of providing the service, although use of the SOIS subnetwork services is assumed. This International Standard con
15、forms to the principles set out in the SOIS Green Book (CCSDS 850.0-G-1; see Reference A6) and it is intended to be applied together with it. The scope and field of application are furthermore detailed in subclauses 1.1 and 1.2 of the enclosed CCSDS publication. 2 Requirements Requirements are the t
16、echnical recommendations made in the following publication (reproduced on the following pages), which is adopted as an International Standard: CCSDS 872.0-M-1, January 2011, Spacecraft onboard interface services Time access service. For the purposes of international standardization, the modification
17、s outlined below shall apply to the specific clauses and paragraphs of publication CCSDS 872.0-M-1. Pages i to v This part is information which is relevant to the CCSDS publication only. Page A-1 Add the following information to the reference indicated: A3 Document CCSDS 301.0-B-3, January 2002, is
18、equivalent to ISO 11104:2003. 3 Revision of publication CCSDS 872.0-M-1 It has been agreed with the Consultative Committee for Space Data Systems that Subcommittee ISO/TC 20/SC 13 will be consulted in the event of any revision or amendment of publication CCSDS 872.0-M-1. To this end, NASA will act a
19、s a liaison body between CCSDS and ISO. BS ISO 17214:2011ISO 17214:2011(E) 2 ISO 2011 All rights reserved(blank page) BS ISO 17214:2011Recommendation for Space Data System Practices SPACECRAFT ONBOARD INTERFACE SERVICESTIME ACCESS SERVICE RECOMMENDED PRACTICE CCSDS 872.0-M-1 MAGENTA BOOK January 201
20、1 ISO 17214:2011(E) ISO 2011 All rights reserved 3BS ISO 17214:2011ISO 17214:2011(E) (blank page) ISO 2011 All rights reserved4BS ISO 17214:2011CCSDS RECOMMENDED PRACTICE FOR SOIS TIME ACCESS SERVICE CCSDS 872.0-M-1 Page i January 2011 AUTHORITY Issue: Recommended Practice, Issue 1 Date: January 201
21、1 Location: Washington, DC, USA This document has been approved for publication by the Management Council of the Consultative Committee for Space Data Systems (CCSDS) and represents the consensus technical agreement of the participating CCSDS Member Agencies. The procedure for review and authorizati
22、on 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 authorization of this document can be obtained from the CCSDS Secretariat at the address below. This document is published and maintained by
23、: CCSDS Secretariat Space Communications and Navigation Office, 7L70 Space Operations Mission Directorate NASA Headquarters Washington, DC 20546-0001, USA ISO 17214:2011(E) ISO 2011 All rights reserved 5BS ISO 17214:2011CCSDS RECOMMENDED PRACTICE FOR SOIS TIME ACCESS SERVICE CCSDS 872.0-M-1 Page ii
24、January 2011 STATEMENT 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 participants, and to formulate sound technic
25、al solutions to these problems. Inasmuch as participation in the CCSDS is completely voluntary, the results of Committee actions are termed Recommendations and are not in themselves considered binding on any Agency. CCSDS Recommendations take two forms: Recommended Standards that are prescriptive an
26、d are the formal vehicles by which CCSDS Agencies create the standards that specify how elements of their space mission support infrastructure shall operate and interoperate with others; and Recommended Practices that are more descriptive in nature and are intended to provide general guidance about
27、how to approach a particular problem associated with space mission support. This Recommended Practice is issued by, and represents the consensus of, the CCSDS members. Endorsement of this Recommended Practice is entirely voluntary and does not imply a commitment by any Agency or organization to impl
28、ement its recommendations in a prescriptive sense. No later than five years from its date of issuance, this Recommended Practice 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 requiremen
29、ts, or new directions; or (3) be retired or canceled. In those instances when a new version of a Recommended Practice is issued, existing CCSDS-related member Practices and implementations are not negated or deemed to be non-CCSDS compatible. It is the responsibility of each member to determine when
30、 such Practices or implementations are to be modified. Each member is, however, strongly encouraged to direct planning for its new Practices and implementations towards the later version of the Recommended Practice. ISO 17214:2011(E) ISO 2011 All rights reserved6BS ISO 17214:2011CCSDS RECOMMENDED PR
31、ACTICE FOR SOIS TIME ACCESS SERVICE CCSDS 872.0-M-1 Page iii January 2011 FOREWORD This document is a technical Recommended Practice for use in developing flight and ground systems for space missions and has been prepared by the Consultative Committee for Space Data Systems (CCSDS). The Time Access
32、Service described herein is intended for missions that are cross-supported between Agencies of the CCSDS, in the framework of the Spacecraft Onboard Interface Services (SOIS) CCSDS area. This Recommended Practice specifies a set of related services to be used by space missions to obtain onboard time
33、. The SOIS Time Access Service provides provides a common service interface and quality of service regardless of the particular type of data link or protocol being used for communication. Through the process of normal evolution, it is expected that expansion, deletion, or modification of this docume
34、nt may occur. This Recommended Practice is therefore subject to CCSDS document management and change control procedures, 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:/w
35、ww.ccsds.org/ Questions relating to the contents or status of this document should be addressed to the CCSDS Secretariat at the address indicated on page i. ISO 17214:2011(E) ISO 2011 All rights reserved 7BS ISO 17214:2011CCSDS RECOMMENDED PRACTICE FOR SOIS TIME ACCESS SERVICE CCSDS 872.0-M-1 Page i
36、v January 2011 At 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 dEtudes Spatiales (CNES)/France. China National Space Administration (CNSA)/Peoples Republic of
37、 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. National Aeronautics and Space Administration (NASA)/USA. Federal Space Agency (FSA)/Russ
38、ian 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 Building (TsNIIMash)/Russian Federation. China Satellite Launch and Tracking Control General, Beijing In
39、stitute of Tracking and Telecommunications Technology (CLTC/BITTT)/China. Chinese Academy of Sciences (CAS)/China. Chinese Academy of Space Technology (CAST)/China. Commonwealth Scientific and Industrial Research Organization (CSIRO)/Australia. CSIR Satellite Applications Centre (CSIR)/Republic of S
40、outh Africa. Danish National Space Center (DNSC)/Denmark. Departamento de Cincia e Tecnologia Aeroespacial (DCTA)/Brazil. European Organization for the Exploitation of Meteorological Satellites (EUMETSAT)/Europe. European Telecommunications Satellite Organization (EUTELSAT)/Europe. Geo-Informatics a
41、nd Space Technology Development Agency (GISTDA)/Thailand. Hellenic National Space Committee (HNSC)/Greece. Indian Space Research Organization (ISRO)/India. Institute of Space Research (IKI)/Russian Federation. KFKI Research Institute for Particle section 2, describing general concepts and assumption
42、s, including security issues; section 3, containing the Time Access Service specification; section 4, containing the Management Information Base (MIB) for this service; section 5, comprising a Service Conformance Statement Proforma. In addition, four informative annexes are provided: annex A, contai
43、ning a list of informative references; annex B, describing how local time registers may be implemented and how the master onboard time value is usually distributed in current spacecraft; annex C, describing aspects of the POSIX API time functions which might be useful to implementers of the Time Acc
44、ess Service; annex D, describing how an implementation of the service may be characterised. ISO 17214:2011(E) ISO 2011 All rights reserved12BS ISO 17214:2011CCSDS RECOMMENDED PRACTICE FOR SOIS TIME ACCESS SERVICE CCSDS 872.0-M-1 Page 1-2 January 2011 1.5 CONVENTIONS AND DEFINITIONS 1.5.1 BIT NUMBERI
45、NG CONVENTION AND NOMENCLATURE In this document, the following convention is used to identify each bit in an N-bit field. The first bit in the field to be transmitted (i.e., the most left justified when drawing a figure) is defined to be Bit 0; the following bit is defined to be Bit 1 and so on up t
46、o Bit N1. When the field is used to express a binary value (such as a counter), the Most Significant Bit (MSB) shall be the first transmitted bit of the field, i.e., Bit 0 (see figure 1-1). Figure 1-1: Bit Numbering Convention In accordance with modern data communications practice, spacecraft data f
47、ields are often grouped into eight-bit words widely known as bytes. Throughout this Recommended Practice, such an eight-bit word is called an octet. The numbering for octets within a data structure starts with zero. By CCSDS convention, any spare bits shall be permanently set to 0. 1.5.2 DEFINITIONS
48、 1.5.2.1 General For the purpose of this document the following definitions apply. 1.5.2.2 Definitions from the Open Systems Interconnection (OSI) Basic Reference Model This document is defined using the style established by the Open Systems Interconnection (OSI) Basic Reference Model (reference A4)
49、. This model provides a common framework for the development of standards in the field of systems interconnection. The following terms used in this Recommended Practice are adapted from definitions given in reference A4: layer: subdivision of the architecture, constituted by subsystems of the same rank. protocol data unit (PDU): unit of data specified in a protocol and consisting of Protocol Control Information (PCI) and possi
