No. 22 - New Avionics On-board Software Activated
26 July 2004 13:26Report for week 16 to 23 July 2004
In the reporting period the uplink and activation of the new avionics on-board software (version 7) has been carried out, probably the most critical operation since launch. The work of this week successfully concluded a four-months period of intense system testing at ESOC, which had followed the development and test activities carried out at Industry since autumn 2003.
The activation of the new software involved commanding a re-boot of the on-board Data Management and Attitude and Orbit Control processors on 22 July, which automatically switched the spacecraft into Safe Mode. It was the first time that Rosetta entered Safe Mode in flight and everything worked very smoothly, from the automatic on-board reconfiguration activities to the six hours of manual recovery controlled from ground.
Since the beginning of the week daily passes were taken, in order to carry out the critical software uplink and activation procedures. Daily passes are foreseen over the next week to monitor the behaviour of the spacecraft with the new on-board software and carry out some in-flight confidence tests.
The table below shows a chronology of the main activities in the reporting period
At the end of the last New Norcia pass in the reporting period (DOY 205) Rosetta was at 69.7 million kilometres from the Earth. The one-way signal travel time was 3 minutes 52 seconds.