BS Z 19:2000 pdf free.Space data and information transfersystems — Data descriptionlanguage — EAST specification.
BS Z 19 The purpose of this document is to establish a common Recommendation for the specificationof a standard language for describing and expressing data in order to interchange them in amore uniform and automated fashion within and among Agencies participating in theConsultative Committee for Space Data Systems (CCSDS).
This Recommendation defines the EAST language used to create descriptions of data, calledData Description Records (DDRs). Such DDRs ensure a complete and exact understandingof the data and allow it to be interpreted in an automated fashion.This means that a softwaretool is able to analyze a DDR and interpret the format of the associated data. This allows thesoftware to extract values from the data on any host machine (i.e., on a different machine fromthe one that produced the data).
A first look at reference [E4], which is a tutorial for the EAST language, may aid the user inunderstanding this document.Reference [E4] describes the requirements, explains how to usethe EAST language to describe non-ambiguous data, and suggests practices and tools to theusers.
This Recommendation is registered under the CCSDS Authority and Description Identifier(ADID): CCSD0010.
The specifications in this document are applicable to all space-related science and engineeringdata exchanges where data descriptions are desired, and these descriptions need to provide anunambiguous description of the record structure of the data.
The Consultative Committee for Space Data Systems has defined the Standard FormattedData Unit(SFDU) concept for the implementation of standard data structures to be used forthe interchange of data within and among space agencies.
SFDU data products may be viewed as containing application data (that is the data which is ofprimary interest，e.g.，actual measurements) and data description information (that is theinformation telling how the application data are formatted).
The data description information shall be provided in a form that is understandable by theagencies involved in the data interchange. That is the reason why the CCSDS must providesome recommendations for the definition of standard description languages. EAST is one ofthe recommended languages.BS Z 19 pdf download.