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No. 23 - Monitoring New Avionics Software

No. 23 - Monitoring New Avionics Software

Report for week 23 July to 30 July 2004In the reporting period the spacecraft was monitored daily to ensure the correct behaviour of its avionics systems after the upload and activation of the new version 7 of the on-board software.

Taking the opportunity of this period of daily contact a number of tests were carried out, which in turn served as confidence checks of the functionality of the new software:

  • the two Navigation Cameras were checked out on 25 July and the first pictures received showed the Earth-Moon system from a distance of 70 million km
  • for the first time the new strategy for reaction wheel offloading in an optimized attitude was used on 27 July, to reduce fuel consumption in high disturbance torques conditions
  • the redundant Transfer Frame Generator (TFG) and Decoder were tested as part of the redundancy commissioning
  • a special Star Tracker test was carried out on 29 July to track stars which have been identified for elimination from the catalogue
  • a new thermal characterization exercise was carried out on 29 July, to observe the thermal behaviour of the spacecraft when the Sun is shining on the -Z side with an inclination of 50 degrees over the +X axis

The TC files containing the patch commands for the redundant avionics processors have been uplinked to the on-board mass memory. The patch of the redundant processors to the new software version 7 is planned for the beginning of August.

The table below shows a chronology of the main activities in the reporting period:

Mission Day



Main Activity



205/206 Monitoring pass, uplink weekly MTL



206/207 Monitoring pass



207/208 NAVCAM commissioning



208/209 Load PM2 v7 TC files to SSMM



209/210 Load PM3 v7 TC files to SSMM



210/211 TFG redundancy switching test



211/212 STR catalogue test, thermal characterization -50°
Decoder redundancy switching test

At the end of the last New Norcia pass in the reporting period (DOY 212) Rosetta was at 71.9 million kilometres from the Earth. The one-way signal travel time was 3 minutes 59 seconds.

Last Update: 1 September 2019
6-Feb-2023 10:03 UT

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