i,
|i I ill Ijll !S!!I :|!n!l|! H'l
Aorde
the error PSD into geoid errors or gravity anomaly errors, in order to investigate
whether or not the mission goals are met. For instance, figure 1 3 shows how the
error from the previous figure propagates into geoid heights.
error PSD (case 330)
,D"l1i mm1 i i i i liiii nmii i inn1 i i mul
ID* IDJ ID*4 ID-" ID* ID
Frequency [Hz]
Figure 12: Error PSD from closed-loop simulations for different gradients. The smooth
curves are the target PSD's (the curve for zzocoincides with the curve for xxj.
10*'
300
Figure 13: Propagation of the measurement error (figure 12) into potential coefficient
errorsgravity anomaly errors and geoid height errors.
Similar calculations are currently being done for many other errors of the sensors,
the control units, the actuators, and other subsystems. This allows to identify
weaknesses and limitations of the mission and system design already prior to the
mission, and to adapt the design to the mission goals.
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