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ISO 11104:2011

(Main)

Space data and information transfer systems — Time code formats

Space data and information transfer systems — Time code formats

ISO 11104:2011 establishes a small number of standardized recommended time code formats for use in data interchange applications between agencies of the CCSDS. ISO 11104:2011 does not address timing performance issues such as stability, precision, accuracy, etc. Time codes are digital representations of time information. ISO 11104:2011 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 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.

Systèmes de transfert des informations et données spatiales — Formats des codes horaires

General Information

Status
Published
Publication Date
04-Dec-2011
ICS
49.140 - Space systems and operations
Technical Committee
ISO/TC 20/SC 13 - Space data and information transfer systems
Drafting Committee
ISO/TC 20/SC 13 - Space data and information transfer systems
Current Stage
9093 - International Standard confirmed
Completion Date
14-Nov-2023
Ref Project

Relations

Revises
ISO 11104:2003 - Space data and information transfer systems — Time code formats
Effective Date
26-Feb-2011

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ISO 11104:2011 - Space data and information transfer systems -- Time code formatsISO 11104:2011 - Space data and information transfer systems -- Time code formats
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ISO 11104:2011 - Space data and information transfer systems -- Time code formats
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INTERNATIONAL ISO
STANDARD 11104
Third edition
2011-12-15


Space data and information transfer
systems — Time code formats
Systèmes de transfert des informations et données spatiales —
Formats des codes horaires




Reference number
ISO 11104:2011(E)
©
ISO 2011

---------------------- Page: 1 ----------------------
ISO 11104:2011(E)

COPYRIGHT PROTECTED DOCUMENT


©  ISO 2011
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
ISO's member body in the country 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 copyright@iso.org
Web www.iso.org
Published in Switzerland

ii © ISO 2011 – All rights reserved

---------------------- Page: 2 ----------------------
ISO 11104:2011(E)
Foreword
ISO (the International 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
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 standardization.
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 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 such 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 vehicles, 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.
© ISO 2011 – All rights reserved iii

---------------------- Page: 3 ----------------------
INTERNATIONAL STANDARD ISO 11104:2011(E)

Space data and information transfer systems — Time 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, accuracy, 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 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.
The 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:
CCSDS 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 only.
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 CCSDS and ISO.
© ISO 2011 – All rights reserved 1

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ISO 11104:2011(E)


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2 © ISO 2011 – All rights reserved

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