ISO 11104:2011

Space data and information transfer systems — Time code formats

Publication date:   Dec 5, 2011

General information

90.93 Standard confirmed   Nov 14, 2023

ISO

ISO/TC 20/SC 13 Space data and information transfer systems

International Standard

49.140   Space systems and operations

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Scope

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.

Life cycle

PREVIOUSLY

WITHDRAWN
ISO 11104:2003

NOW

PUBLISHED
ISO 11104:2011
90.93 Standard confirmed
Nov 14, 2023

Relations

Adopted from CCSDS 301.0-B-4