Fig 1.
SGCMG system structure diagram.
Fig 2.
Servo system two-mass model.
Fig 3.
Servo system two-mass model transfer function block diagram.
Fig 4.
Frequency characteristic curve including the mechanical resonance frequency.
Table 1.
Rotational inertia of the SGCMG gimbal servo system.
Fig 5.
Schematic diagram of the SGCMG rotating mechanism.
Fig 6.
Frequency nephogram of each order.
Table 2.
Natural frequency of each order.
Fig 7.
System identification flowchart.
Fig 8.
System identification principle diagram.
Fig 9.
System identification experiment.
Table 3.
The parameters of the sinusoidal frequency sweep signal.
Fig 10.
Single frequency input and output curves.
Fig 11.
Sinusoidal frequency sweep signal input and output curves.
Fig 12.
The frequency characteristic curve of the SGCMG servo system.
Fig 13.
Comparison of frequency characteristic curves obtained by orthogonal correlation analysis and Fourier transform method.
Fig 14.
Frequency characteristic curves of acquisition and identification.
Fig 15.
Identification errors.