CCSDS 508.0-R-1, Conjunction Data Message (Red Book, Issue 1 ...

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DRAFT CCSDS RECOMMENDED STANDARD FOR CONJUNCTION DATA MESSAGESThis Recommended Standard is applicable only to the message format and content, but not toits transmission nor to the algorithms used to produce the data within. The method oftransmitting the message between exchange partners is beyond the scope of this documentand could be specified in an ICD.The methods used to predict conjunctions and calculate the probability of collision, and thedefinition of the conjunction assessment accuracy underlying a particular CDM, are alsooutside the scope of this Recommended Standard.1.3 DOCUMENT STRUCTURESection 2 provides a brief overview of the CCSDS-proposed CDM.Section 3 provides details about the structure and content of the CDM in ‘Keyword = ValueNotation’ (KVN).Section 4 provides details about the structure and content of the CDM in eXtensible MarkupLanguage (XML).Section 5 addresses the CDM data in general.Section 6 discusses the syntax considerations of the CDM.Annex A is a list of abbreviations and acronyms applicable to the CDM.Annex B provides rationale and requirements for the CDM Recommended Standard.Annex C provides a description of the CA information contained in the CDM.Annex D provides informative references.Annex E provides information on security, the Space Assigned Numbers Authority (SANA),and patent-related information.Annex F provides an example CDM XML schema definition.Annex G provides a CDM XML-to-KVN translator.1.4 CONVENTIONS AND DEFINITIONS1.4.1 NOTATION1.4.1.1 GeneralThe following notational conventions are used in this document:a) multiplication of units is denoted with a single asterisk ‘*’ (e.g., ‘[kg*s]’);CCSDS 508.0-R-1 Page 1-2 March 2012
DRAFT CCSDS RECOMMENDED STANDARD FOR CONJUNCTION DATA MESSAGESb) exponents of units are denoted with a double asterisk (i.e., ‘**’, for example, m/s 2 =m/s**2).1.4.1.2 Unit NotationsThe following conventions for unit notations apply throughout this Recommended Standard.Insofar as possible, an effort has been made to use units that are part of the InternationalSystem of Units (SI); units are either SI base units, SI derived units, or units outside the SIthat are accepted for use with the SI (see reference [1]). There is one specific case, that of thenotation for degrees of plane angle, where the notation that is more widely used in thenavigation community is specified (‘deg’ instead of ‘°’), but every effort has been made tominimize these departures from the SI. The units used within this document are as follows:– deg: degrees of plane angle;– km: kilometers;– m: meters;– m/s: meters per second;– m**2/s: square meters per second;– m**2/s**2: square meters per second squared;– d: days, 86400 SI seconds;– h: hours, 3600 SI seconds;– s: SI seconds;– kg: kilograms;– W/kg: watt per kilogram.1.4.2 NOMENCLATURE1.4.2.1 GeneralThe CDM contains information about a conjunction between two space objects (hereafterreferred to as ‘Object1’ and ‘Object2’).1.4.2.2 Normative TextThe following conventions apply for the normative specifications in this RecommendedStandard:a) the words ‘shall’ and ‘must’ imply a binding and verifiable specification;CCSDS 508.0-R-1 Page 1-3 March 2012
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