Study of the calibration roll plan for the offset determination of the JUICE magnetometer

JUICE is a future ESA mission exploring Jupiter's system and in particular investigating Ganymede's environment. One of the most important instruments of the spacecraft is the magnetometer, which allows to study Ganymede's ocean. The magnetometer needs a precise calibration to provide accurate measurements, thus roll campaigns to determine its offset needs to be done during the mission. This thesis focuses on the analysis of the different versions of the trajectory of JUICE to verify whether the requirements reported in the calibration plan written by ESA are satisfied and to examine the variation of the direction of the magnetic field vector B along a single roll of the spacecraft. The roll campaigns for each trajectory characterized by the lowest variation of the direction of B have been identified as the optimum campaigns. Then they have been compared to determine the best trajectory version to choose concerning the calibration phase along the orbit. A modification of the calibration plan has been proposed in order to decrease significantly the variation of the direction of B: performing non-consecutive rolls. CReMA 3.0 is showed to be the best version both considering a roll rate of 0.05 deg/s and 0.07 deg/s and both executing consecutive and non-consecutive rolls.