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Figure 1
(Color online) Ground migration caused by micro vibration
Figure 2
(Color online) Overall layout of the satellite GF-4
Figure 3
(Color online) Test result of disturbing force spectrum of the momentum wheel
Figure 4
(Color online) Test result of disturbing force spectrum of a crycooler
Figure 5
The flowchart of the analysis process
Figure 6
(Color online) Schematic diagram of micro vibration in one period
Figure 7
(Color online) The finite element model of the GF-4 camera
Figure 8
(Color online) Damping bar assembly
Figure 9
(Color online) Damping beam to support secondary mirror
Figure 10
(Color online) Comparison of transmissibility curves of the main optical system in $X$ direction
Figure 11
(Color online) Comparison of transmissibility curves of the main optical system in $Y$ direction
Figure 12
(Color online) Comparison of transmissibility curves of the main optical system in $Z$ direction
Figure 13
(Color online) Example image to verify the MTF in orbit
| Specification of momentum wheel (Nm) | $X$ (N) | $Y$ (N) | $Z$ (N) |
| 0.5 | 5.763 | 4.987 | 10.343 |
| 0.1 | 2.955 | 3.214 | 2.560 |
| Power (W) | $X$ (N) | $Y$ (N) | $Z$ (N) |
| 50 | 2.797 | 1.837 | 5.442 |
| 80 | 3.463 | 2.375 | 6.567 |
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