During the MIO battery maintenance test, we found some problem in MEA1 and MEA2 HK telemetry.
All packets for HK telemetry were not sent in chronological order.
When downloading TM from antenna 167 (0xA7)
We found some time-tags backwards, and HK packets doesn’t have a regularly increasing sequence_number
For each HK packet, we compare current and latest sequence_number CCSDS field for a given APID.
We could find :
-
Some gaps : DELTA_SEQ > 1
-
Some backwards : DELTA_SEQ < 0
MEA1 HK : 151 records
MEA2 HK : 167 records
when downloading TM from antenna 162 (0xA2)
We didn’t see any sequence_number backward, but still some gaps
MEA1 HK : 129 records
MEA2 HK : 151 records
