1、 Reference number ISO 11104:2011(E) ISO 2011INTERNATIONAL STANDARD ISO 11104 Third edition 2011-12-15Space data and information transfer systems Time code formats Systmes de transfert des informations et donnes spatiales Formats des codes horaires ISO 11104:2011(E) COPYRIGHT PROTECTED DOCUMENT ISO 2
2、011 All rights 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 co
3、untry of the 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 reservedISO 11104:2011(E) ISO 2011 All rights reserved iiiForeword ISO (the Internationa
4、l 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 been es
5、tablished 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 standardi
6、zation. 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 vot
7、ing. 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 suc
8、h patent rights. ISO 11104 was prepared by the Consultative Committee for Space Data Systems (CCSDS) (as CCSDS 301.0-B-4, November 2010) and was adopted (without modifications except those stated in Clause 2 of this International Standard) by Technical Committee ISO/TC 20, Aircraft and space vehicle
9、s, Subcommittee SC 13, Space data and information transfer systems. This third edition cancels and replaces the second edition (ISO 11104:2003), which has been technically revised. INTERNATIONAL STANDARD ISO 11104:2011(E) ISO 2011 All rights reserved 1Space data and information transfer systems Time
10、 code formats 1 Scope This International Standard establishes a small number of standardized recommended time code formats for use in data interchange applications between agencies of the CCSDS. This International Standard does not address timing performance issues such as stability, precision, accu
11、racy, etc. Time codes are digital representations of time information. This International Standard describes four standard recommended time codes (one “unsegmented“ and three “segmented“ codes) which use the international standard second as the fundamental unit of time. An unsegmented time code is a
12、 pure binary count of time units and fractional time units from a starting time called the “epoch“. A segmented time code is one in which the count of time units and fractional time units is accumulated in two or more cascaded counters which count modulo of various bases and start from the epoch. Th
13、e scope and field of application are furthermore detailed in subclauses 1.2 to 1.4 of the enclosed CCSDS publication. 2 Requirements Requirements are the technical recommendations made in the following publication (reproduced on the following pages), which is adopted as an International Standard: CC
14、SDS 301.0-B-4, November 2010, Time code formats. For the purposes of international standardization, the modifications outlined below shall apply to the specific clauses and paragraphs of publication CCSDS 301.0-B-4. Pages i to v This part is information which is relevant to the CCSDS publication onl
15、y. 3 Revision of publication CCSDS 301.0-B-4 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 301.0-B-4. To this end, NASA will act as a liaison body between CC
16、SDS and ISO. ISO 11104:2011(E) 2 ISO 2011 All rights reserved(Blank page) Recommendation for Space Data System Standards TIME CODE FORMATS RECOMMENDED STANDARD CCSDS 301.0-B-4 BLUE BOOK November 2010 ISO 11104:2011(E) ISO 2011 All rights reserved 3ISO 11104:2011(E) 4 ISO 2011 All rights reserved (Bl
17、ank page)CCSDS RECOMMENDATION FOR TIME CODE FORMATS CCSDS 301.0-B-4 Page i November 2010 AUTHORITY Issue: Recommended Standard, Issue 4 Date: November 2010 Location: Washington, DC, USA This document has been approved for publication by the Management Council of the Consultative Committee for Space
18、Data Systems (CCSDS) 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 partici
19、pation in the authorization 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 20546-0
20、001, USA ISO 11104:2011(E) ISO 2011 All rights reserved 5CCSDS RECOMMENDATION FOR TIME CODE FORMATS CCSDS 301.0-B-4 Page ii November 2010 STATEMENT OF INTENT The Consultative Committee for Space Data Systems (CCSDS) is an organization officially established by the management of its members. The Comm
21、ittee meets periodically to address data systems problems that are common to all 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 c
22、onsidered binding on any Agency. This Recommended Standard is issued by, and represents 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 standar
23、d, this standard will be in accord with the relevant Recommended Standard. Establishing 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
24、: - The standard itself. - The anticipated date of initial operational capability. - 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
25、of agreement. No later than five years from its date of issuance, this Recommended 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 reti
26、red or canceled. In those instances when a new version of a Recommended Standard 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 a
27、re to be modified. Each member is, however, strongly encouraged to direct planning for its new standards and implementations towards the later version of the Recommended Standard. ISO 11104:2011(E) 6 ISO 2011 All rights reservedCCSDS RECOMMENDATION FOR TIME CODE FORMATS CCSDS 301.0-B-4 Page iii Nove
28、mber 2010 FOREWORD This document is a technical Recommended Standard for time code formats and has been prepared by the Consultative Committee for Space Data Systems (CCSDS). The set of time code formats described in this Recommended Standard is the baseline concept for time representation in data i
29、nterchange applications that are cross-supported between Agencies of the CCSDS. This Recommended Standard establishes a common framework and provides a common basis for the formats of time code data. It allows implementing organizations within each agency to proceed coherently with the development o
30、f compatible derived Standards for the flight and ground systems that are within their cognizance. Derived Agency Standards may implement only a subset of the optional features allowed by the Recommended Standard and may incorporate features not addressed by this Recommended Standard. Through the pr
31、ocess of normal evolution, it is expected that expansion, deletion or modification to this document may occur. This Recommended Standard is therefore subject to CCSDS document management and change control procedures which are defined in reference 1. Current versions of CCSDS documents are maintaine
32、d 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 Secretariat at the address indicated on page i. ISO 11104:2011(E) ISO 2011 All rights reserved 7CCSDS RECOMMENDATION FOR TIME CODE FORMATS CCSDS 301.0-B-4 Page
33、 iv November 2010 At time of publication, the active Member and Observer Agencies of the CCSDS were: Agenzia Spaziale Italiana (ASI)/Italy. Member Agencies Canadian Space Agency (CSA)/Canada. Centre National dEtudes Spatiales (CNES)/France. China National Space Administration (CNSA)/Peoples Republic
34、 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. National Aeronautics and Space Administration (NASA)/USA. Federal Space Agency (FSA)/R
35、ussian Federation. UK Space Agency/United Kingdom. Austrian Space Agency (ASA)/Austria. Observer Agencies Belgian Federal Science Policy Office (BFSPO)/Belgium. Central Research Institute of Machine Building (TsNIIMash)/Russian Federation. China Satellite Launch and Tracking Control General, Beijing
36、 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 Industrial Research Organization (CSIRO)/Australia. CSIR Satellite Applications Centre (CSIR)/Republic o
37、f South 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-Informatic
38、s 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 Federation. KFKI Research Institute for Particle & Nuclear Physics (KFKI)/Hungary. Korea Aerospace
39、Research Institute (KARI)/Korea. Ministry of Communications (MOC)/Israel. National Institute of Information and Communications Technology (NICT)/Japan. National Oceanic and Atmospheric Administration (NOAA)/USA. National Space Agency of the Republic of Kazakhstan (NSARK)/Kazakhstan. National Space O
40、rganization (NSPO)/Chinese Taipei. Naval Center for Space Technology (NCST)/USA. Scientific and Technological Research Council of Turkey (TUBITAK)/Turkey. Space and Upper Atmosphere Research Commission (SUPARCO)/Pakistan. Swedish Space Corporation (SSC)/Sweden. ISO 11104:2011(E) 8 ISO 2011 All right
41、s reservedCCSDS RECOMMENDATION FOR TIME CODE FORMATS CCSDS 301.0-B-4 Page v November 2010 United States Geological Survey (USGS)/USA. ISO 11104:2011(E) ISO 2011 All rights reserved 9CCSDS RECOMMENDATION FOR TIME CODE FORMATS CCSDS 301.0-B-4 Page vi November 2010 DOCUMENT CONTROL Document Title Date
42、Status CCSDS 301.0-B-1 Time Code Formats, Issue 1 January 1987 Original issue, superseded CCSDS 301.0-B-2 Time Code Formats, Issue 2 April 1990 Issue 2, superseded CCSDS 301.0-B-3 Time Code Formats, Issue 3 January 2002 Issue 3, superseded CCSDS 301.0-B-4 Time Code Formats, Recommended Standard, Iss
43、ue 4 October 2008 Current issue: defines a second P-Field octet for the CCSDS Unsegmented Time Code (CUC) adds a new section on security updates some editorial elements NOTE Substantive changes from the previous issue are identified by change bars in the inside margin. ISO 11104:2011(E) 10 ISO 2011
44、All rights reservedCCSDS RECOMMENDATION FOR TIME CODE FORMATS CCSDS 301.0-B-4 Page vii November 2010 CONTENTS Section Page 1 INTRODUCTION 1-1 1.1 PURPOSE AND OVERVIEW . 1-1 1.2 SCOPE 1-1 1.3 CATEGORIZING OF CCSDS TIME CODE FORMATS . 1-1 1.4 APPLICABILITY . 1-2 1.5 BIT NUMBERING CONVENTION AND NOMENC
45、LATURE 1-2 2 SECURITY . 2-1 2.1 SECURITY BACKGROUND 2-1 2.2 SECURITY CONCERNS . 2-1 2.3 POTENTIAL THREATS AND ATTACK SCENARIOS 2-2 2.4 CONSEQUENCES OF NOT APPLYING SECURITY 2-2 3 TIME CODE FORMATS . 3-1 3.1 TIME CODE FIELDS 3-1 3.2 CCSDS UNSEGMENTED TIME CODE (CUC) 3-2 3.3 CCSDS DAY SEGMENTED TIME C
46、ODE (CDS) . 3-3 3.4 CCSDS CALENDAR SEGMENTED TIME CODE (CCS) 3-4 3.5 CCSDS ASCII CALENDAR SEGMENTED TIME CODE (ASCII) 3-6 3.6 AGENCY-DEFINED CODES . 3-9 ANNEX A RANGE OF SEGMENT COUNTERS FOR SEGMENTED TIME CODES (Normative) . A-1 ANNEX B RATIONALE FOR TIME CODES (Informative) .B-1 ANNEX C GLOSSARY O
47、F SELECTED TIME TERMS (Informative). C-1 ANNEX D CONVERSION BETWEEN TAI AND UTC (Informative) . D-1 ANNEX E EXAMPLE OF ACCOMMODATION OF AGENCY-DEFINED CODES (PB-5J) (Informative)E-1 ANNEX F INFORMATIVE REFERENCES (Informative) F-1 Table B-1 Applicability of the Criteria B-2 B-2 Time Code Services B-
48、3 B-3 Service Categories of Time Codes B-4 ISO 11104:2011(E) ISO 2011 All rights reserved 11ISO 11104:2011(E) 12 ISO 2011 All rights reserved (Blank page)CCSDS RECOMMENDATION FOR TIME CODE FORMATS CCSDS 301.0-B-4 Page 1-1 November 2010 1 INTRODUCTION 1.1 PURPOSE AND OVERVIEW The purpose of this Reco
49、mmended Standard is to establish a small number of standardized recommended time code formats for use in data interchange applications between Agencies of the CCSDS. This Recommended Standard does not address timing performance issues such as stability, precision, accuracy, etc. 1.2 SCOPE Time codes are digital representations of time informati
