[MOIMS-NAV-EXEC] CCSDS 502.0-B-3: OMM Standard Clarifications

[irene.caracciolo at dlr.de]

Dear Navigation Working Group,

With the following email I would like to raise some questions regarding Chapter 4, sections 4.2.3 and 4.2.4 of the CCSDS 502.0-B-3 document. 
Specifically, in Table 4-2 the MEAN_ELEMENT_THEORY keyword has the following examples: SGP, SGP4, SGP4-XP, DSST and USM, but in Table 4-3 the section dedicated to TLE Related Parameters is only required if MEAN_ELEMENT_THEORY = SGP/SGP4, which is not included as example in Table 4-2. Moreover, this condition seems to be misleading when considering the BSTAR/BTERM and the MEAN_MOTION_DDOT/AGOM keywords, for which different conditions are defined in terms of MEAN_ELEMENT_THEORY. For instance:

 

*	BSTAR or BTERM are required for MEAN_ELEMENT_THEORY =SGP4 and MEAN_ELEMENT_THEORY = SGP4-XP respectively (which are not considered in the main condition);

*	MEAN_MOTION_DDOT or AGOM are requested only if MEAN_ELEMENT_THEORY=SGP or PPT3 and MEAN_ELEMENT_THEORY=SGP4-XP (which are not considered in the main condition).

 

These two cases raise the following doubts:

1.	Should the TLE Related Parameters section be considered also if MEAN_ELEMENT_THEORY= SGP, SGP4, SGP4-XP, PPT3 ? 
2.	A) If not, should the BSTAR/BTERM and the MEAN_MOTION_DDOT/AGOM keywords be excluded from the section?

B) If yes, if MEAN_ELEMENT_THEORY=SGP or PPT3 should the BSTAR/BTERM be excluded? Same question goes for MEAN_MOTION_DDOT/AGOM if MEAN_ELEMENT_THEORY= SGP4.

 

Thank you in advance for your assistance. 

 

Kind regards,

Irene Caracciolo

 

 

——————————————————————————

Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)

German Aerospace Center

Space Operations and Astronaut Training | Spaceflight Technology | Münchener Str. 20 | 82234 Weßling | Germany

 

Irene Caracciolo | Flight Dynamics Services  

Phone +49 8153 28 3017 | Mobile +39 392 6160389 |  <mailto:irene.caracciolo at dlr.de> irene.caracciolo at dlr.de

 <http://www.dlr.de/> DLR.de

 

DLR is represented by the Executive Board and employees authorised by it.
Head of DLR's legal department, Linder Hoehe, 51147 Cologne, can provide information ( <https://dlr.de/imprint> DLR.de/imprint).

 

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