Attitude Data Messages - CCSDS

CCSDS RECOMMENDED STANDARD FOR ATTITUDE DATA MESSAGES
ANNEX B
RATIONALE FOR ATTITUDE DATA MESSAGES
(INFORMATIVE)
B1
OVERVIEW
This annex presents the rationale behind the design of each message. It may help the
application engineer to select a suitable message. Corrections and/or additions to these
requirements are expected during future updates.
A specification of requirements agreed to by all parties is essential to focus design and to
ensure the product meets the needs of the Member Agencies. There are many ways of
organizing requirements, but the categorization of requirements is not as important as the
agreement to a sufficiently comprehensive set. In this annex the requirements are organized
into three categories:
a) Primary Requirements: These are the most elementary and necessary requirements.
They would exist no matter the context in which the CCSDS is operating, i.e.,
regardless of pre-existing conditions within the CCSDS or its Member Agencies.
b) Heritage Requirements: These are additional requirements that derive from preexisting
Member Agency requirements, conditions, or needs. Ultimately these carry
the same weight as the Primary Requirements. This Recommended Standard reflects
heritage requirements pertaining to some of the technical participants’ home
institutions collected during the preparation of the document; it does not speculate on
heritage requirements that could arise from other Member Agencies.
c) Desirable Characteristics: These are not requirements, but they are felt to be
important or useful features of the Recommended Standard.
CCSDS 504.0-B-1 Page B-1 May 2008