BS ISO 20205:2015 pdf download – Space data and information transfer systems — Spacecraft Onboard Interface Systems — Low Data-Rate Wireless Communications for Spacecraft Monitoring and Control
1.1 PURPOSE This document presents the recommended practices for the utilization of low data-rate wireless communication technologies in support of spacecraft ground testing and flight monitoring and control applications. Relevant technical background information can be found in reference [3]. The recommended practices contained in this document enable member agencies to select the best option(s) available for interoperable wireless communications in the support of spacecraft monitoring and control applications. The specification of a Recommended Practice facilitates interoperable communications and forms the foundation for cross-support of communication systems between separate member space agencies.
1.2 SCOPE This Recommended
Practice is targeted towards monitoring and control systems, typically low data-rate and low-power wireless-based applications.
This Recommended Practice specifies protocols (including at least the Physical [PHY] layer and Medium Access Control [MAC] sublayer of the Open Systems Interconnection [OSI] Model—see reference [F1]) that enable a basic interoperable wireless communication system to support low data-rate spacecraft monitoring and control applications.
From an engineering standpoint, mission managers, along with engineers and developers, are faced with a plethora of wireless communication choices, both standards-based and proprietary. This Recommended Practice provides guidance in the selection of systems necessary to achieve interoperable communications in support of wireless, low data-rate monitoring and control. 1.5 DOCUMENT STRUCTURE This document is composed from a top-down (technology) perspective, first defining the technology as a recommended practice, then providing informative material supporting specific application profiles. (For more information on space mission use cases addressed by wireless technologies, see reference [3]). Section 2 provides an informational overview of the rationale and benefits of spacecraft onboard wireless technologies for use in spacecraft monitoring and control operations.
Section 3 provides recommended practices and applicable standards relating to low data-rate wireless communication systems.
Annex A justifies the choice of an alternative, scheduled medium access scheme.
Annex B discusses security considerations related to the specifications in this document.
Annex C provides an informative description of the recommended practices, through an overview of the technologies, and a set of application profiles where the recommendations
are applicable.
Annex D provides justification for selection of the 2.4 GHz band.
Annex E lists abbreviations used in this document along with their expanded forms.
Annex F provides a list of informative references.
low data-rate: 250 kbps or less.
NOTE – In general the definition of low data-rate is somewhat ambiguous; for this Recommended Practice it is specified as 250 kbps.
low power: 10 mW or less (typical).
quality of service, QoS: The ability to provide different priority to different applications,users, or data flows, or to guarantee a certain level of performance to a data flow.
The following conventions apply for the normative specifications in this Recommended Practice:
a) the words ‘shall’ and ‘must’ imply a binding and verifiable specification;
b) the word ‘should’ implies an optional, but desirable, specification;
c) the word ‘may’ implies an optional specification;
d) the words ‘is’, ‘are’, and ‘will’ imply statements of fact.
NOTE – These conventions do not imply constraints on diction in text that is clearly informative in nature.
In the normative section of this document, informative text is set off from the normative specifications either in notes or under one of the following subsection headings:
– Overview;
– Background;
– Rationale;
– Discussion.
The following publications contain provisions, which through reference in this text, constitute provisions of this document. At the time of publication, the editions indicated were valid. All publications are subject to revision, and users of this document are encouraged to investigate the possibility of applying the most recent editions of the publications indicated below. The CCSDS Secretariat maintains a register of currently valid CCSDS publications.