[Moims-sc] SM&C WG Action 141111-09: ESA XTCE Strategy

Mario.Merri at esa.int Mario.Merri at esa.int
Wed Dec 17 15:26:54 UTC 2014

Dear all,

during the last CCSDS meeting, NASA stated that they would like to make 
GovSat (the NASA tailoring of XTCE) a CCSDS standard (not yet clear what 
book colour). They asked if we (ESA, Europe or both) would like to do the 
same with XTCE-CC and I took an action on this. This email aims at 
answering to this action.

Action 141111-09        MM to check if the EGC-CC ICD based on XTCE could 
be published as it may be done for NASA/GovSat (i.e. directly in SANA). 
Due 31Dec14.

The ESA strategy on XTCE is to develop a tailoring of XTCE as the exchange 
format for the TM/TC information of the EGS-CC, the next generation 
European monitoring and control infrastructure. The scope of the EGS-CC 
XTCE exchange format, XTCE-CC, has been restricted to the XTCE native 
scope (TM/TC general concepts without EGS-CC specific aspects) with a 
minimum set of extensions to ensure consistency of the mapping and data 
exchange, without changing the semantics of the XTCE standard. In 
addition, the compatibility of XTCE-CC with the ISIS XTCE (XTCE tailoring 
by CNES)  is being considered already for the production of the XTCE-CC. 
An ICD is being produced to define the XTCE-CC tailoring, with an annex 
listing the deviations with respect to ISIS ICD, and how to handle them 
for compatibility.

Response to Action
At the end of this exercise there will hopefully be a tailoring of XTCE, 
XTCE-CC, that is also compatible with the CNES ISIS. This tailoring could 
be a candidate for standardisation similarly as the one done by NASA with 
GovSat. This will be known approximately mid 2015. It may also make sense 
to wait for the publication of XTCE1.2.

Use Cases
A. European S/C and US MCS: Option 1: US MCS use XTCE-CC native; Option 2: 
European S/C generates GovSat; Option 3: A converter exists 
B. US S/C and European MCS: Option 1: European MCS use GovSat native; 
Option 2: US S/C generates XTCE-CC; Option 3: A converter exists 
C. Interoperability between ESA and CNES
D. Use either GovSat/XTCE-CC to exchange TM/TC info with other 
applications within the ground segment (e.g. MPS, SIM, FDS)



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