[Sls-slp] SLS-SLP Presentation to SLS area Plenary

Takahiro Yamada tyamada at pub.isas.jaxa.jp
Mon Jun 16 15:27:54 UTC 2008

Gian Paolo,

> We would really appreciate knowing some details on the NASA/JPL (Ed? 
> Greg?) and JAXA (Takahiro?) implementations of this feature also to 
> understand how much those implementations are within the line of the 
> current standards.

For deep space missions, we send each command frame (actually, it is a 
CLTU) multiple times in order to decrease the probability of 
retransmission. For example, if we are to send command frames #1, #2, 
#3, and #4, we send #1, #1, #2, #2, #3, #3, #4, and #4. This is a case 
in which we send the same command twice and this is what we use for our 
asteroid mission, but we can send the same command any number of times.

For doing retransmission, we use COP-1 as specified by CCSDS.

I'm not sure if this violates the specification of COP-1 but I will 
check it when I have time.

Best regards,
Takahiro Yamada.

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