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

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DRAFT CCSDS RECOMMENDED STANDARD FOR CONJUNCTION DATA MESSAGESKeywordNUMBER_SENSORSTRACKING_DATA_TYPESADDITIONAL_TRACKINGCOVARIANCE_METHODMANEUVERABLEMAN_INCLUDEDORBIT_CENTERREF_FRAMEGRAVITY_MODELATMOSPHERIC_MODELN_BODY_PERTURBATIONSSOLAR_RAD_PRESSUREEARTH_TIDESINTRACK_THRUSTDescriptionThe number of sensors thatwere used to provide theobservations used in the OrbitDetermination (OD) of theobject.Describes the type(s) of trackingdata used in the OD of theobject.Has additional sensor trackingbeen applied to the OD of theobject (see annex C fordefinition)?Describes if the covariance wascalculated during the OD thatproduced the state vector or a ifdefault value was used.The maneuver capacity of theobject.In the event that an externalephemeris was used to calculatethe CA, this indicates that amaneuver was included in theexternally provided ephemeris.Defines the central body aboutwhich Object1 and Object2 orbit.If not specified, the center isassumed to be Earth.Name of the reference frame inwhich the state vector data aregiven (value must be selectedfrom the list of values to the right(see reference [D1]) and beconsistent between Object1 andObject2).The gravity model used for theOD of the object (see annex Cunder GRAVITY_MODEL fordefinition).The atmospheric drag modelused for the OD of the object.The N-body gravitationalperturbations that were used forthe OD of the object.Are solar radiation pressureperturbations used for the OD ofthe object?Are solid earth and ocean tidesused for the OD of the object?Is in-track thrust modeling usedfor the OD of the object?Normative Values/Examples N/E Obligatory1,2,3 E NoRADAR, OPTICAL,GPS, DOPPLERENoYES, NO N NoCALCULATED,DEFAULTNYesYES, NO,N YesUNKNOWNYES, NO N NoEARTH, SUN,MOON, MARS,GCRFEME2000ITRFEGM-96: 36D 36O,WGS-84_GEOID:24D 24O,JGM-2 : 41D 41OJACCHIA 70, MSIS,JACCHIA 70 DCA,NONEMOON, SUN,MARS, JUPITERENEEENoYesNoNoNoYES, NO N NoYES, NO N NoYES, NO N NoCCSDS 508.0-R-1 Page 3-6 March 2012
DRAFT CCSDS RECOMMENDED STANDARD FOR CONJUNCTION DATA MESSAGES3.5 CDM DATA3.5.1 The CDM Data section shall be formed as logical blocks:– OD Parameters;– Additional Parameters;– State Vector; and– Covariance.3.5.2 The logical blocks of the CDM Data section shall consist of KVN elements asdefined in table 3-4, which specifies for each data item:a) the keyword to be used;b) a short description of the item;c) the units to be used; andd) whether the item is obligatory or optional.Table 3-4: CDM KVN DataKeyword Description Units ObligatoryCOMMENT (See 6.2.4 for formatting rules.) n/a NoOD ParametersCOMMENT (See 6.2.4 for formatting rules.) n/a NoTIME_LASTOBThe time in UTC of the last accepted observationused in the OD of the object. This can be enteredas the exact time (see 6.2.2.11 for formattingrules) or an elapsed time, from the messagecreation time, that includes the time of the lastaccepted observation used in the OD of theobject. The rules for the latter case are as follows(see 6.2.2.12 for formatting rules):n/a or hNoFor all Near Earth (NE) objects:- Less than 6 hours from message creation time- 6 to 12 hours from message creation time- Greater than 12 hours from message creationtimeFor all Far From Earth (FE) objects (see annex Cunder TIME_LASTOB for definition of FE):- Less than 24 hours from message creation time- 24 to 48 hours from message creation time- Greater than 48 hours from message creationtimeRECOMMENDED_OD_SPANThe recommended OD time span calculated forthe object (see annex C for definition).dNoCCSDS 508.0-R-1 Page 3-7 March 2012
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