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

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DRAFT CCSDS RECOMMENDED STANDARD FOR CONJUNCTION DATA MESSAGES6.2.1.10 Any white space immediately preceding or following the keyword shall not besignificant.6.2.1.11 Any white space immediately preceding or following the ‘equals’ sign shall not besignificant.6.2.1.12 Any white space immediately preceding the end of line shall not be significant.6.2.1.13 The order of occurrence of obligatory and optional KVN assignments shall be fixedas shown in the tables in section 3 that describe the CDM keywords.6.2.2 CDM VALUES IN KVN6.2.2.1 A nonempty value field must be specified for each obligatory keyword.6.2.2.2 Integer values shall consist of a sequence of decimal digits with an optional leadingsign (‘+’ or ‘-’). If the sign is omitted, ‘+’ shall be assumed. Leading zeroes may be used.The range of values that may be expressed as an integer is:-2,147,483,648
DRAFT CCSDS RECOMMENDED STANDARD FOR CONJUNCTION DATA MESSAGESd) The exponent must be an integer, and may have either a ‘+’ or ‘-’ sign (if the sign isomitted, then ‘+’ shall be assumed).e) The maximum positive floating point value is approximately 1.798E+308, with 16significant decimal digits precision. The minimum positive floating point value isapproximately 4.94E-324, with 16 significant decimal digits precision.6.2.2.6 Text value fields must be constructed using only all uppercase or all lowercase.6.2.2.7 Blanks shall not be used within numeric values.6.2.2.8 Time strings must follow the formats specified in 6.2.2.11.6.2.2.9 In value fields that are text, an underscore shall be equivalent to a single blank.Individual blanks shall be retained (shall be significant), but multiple contiguous blanks shallbe equivalent to a single blank.6.2.2.10 All time tags in the CDM shall be in UTC.6.2.2.11 In value fields that represent a time tag, times shall be given in one of the followingtwo formats:yyyy-mm-ddThh:mm:ss[.d→d]oryyyy-dddThh:mm:ss[.d→d]where ‘yyyy’ is the year, ‘mm’ is the two-digit month, ‘dd’ is the two-digit day-of-month and‘ddd’ is the three-digit day of the year, separated by hyphens, ‘T’ is a fixed separatorbetween the date and time portions of the string, and ‘hh:mm:ss[.d→d]’ is the time in hours,minutes, seconds and fractional seconds, separated by colons. As many ‘d’ characters to theright of the period as required may be used to obtain the required precision, up to themaximum allowed for a fixed-point number. Because all times in the CDM are UTC, the ‘Z’indicator allowed by the CCSDS Time Codes Recommended Standard should be omitted. Allfields require leading zeros. (See reference [5], ASCII Time Code A or B.)6.2.2.12 In the value fields that represent TIME_LASTOB, the data type shall be either theexact time (see 6.2.2.11 for formatting rules) or an elapsed time, from the message creationtime, since the last observation used in the OD of the object. When the elapsed time option ischosen, the notation ‘’ shall be used.NOTE – The ‘’ means ‘greaterthan’, as in ‘> 12’, meaning ‘greater than twelve hours’.CCSDS 508.0-R-1 Page 6-3 March 2012
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CCSDS 508.0-R-1, Conjunction Data Message (Red Book, Issue 1 ...

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