Spaceborne novel high-precision high-stability two-dimensional pointing mechanism

Abstract

The invention relates to a novel spaceborne high-precision high-stability two-dimensional pointing mechanism. The mechanism comprises an azimuth movement mechanism and a pitching direction movement mechanism. The azimuth direction movement mechanism comprises a pointing mirror, a pointing mirror frame, a press plate, a flexible pivot assembly, a support frame and a slider-crank mechanism. The pitching direction movement mechanism comprises a pivot assembly, a fixed seat machine, and a slider-crank mechanism. The rotation of pointing mirrors around rotation shafts in the azimuth direction movement mechanism and the pitching direction movement mechanism is swinging of cranks in the slider-crank mechanisms. Rotation shafts in the azimuth direction movement mechanism and the pitching direction movement mechanism are orthogonal rotation shafts of each other and axes of the two rotation shafts are on the mirror face of the pointing mirrors. The two-dimensional pointing mechanism is characterized by high pointing precision and high system stability, a disadvantage is overcome that the pointing precision and the system stability cannot be considered simultaneously in a two-dimensional pointing mechanism in the former spaceflight optical remote sensing device, and improving of pointing and tracking precision of the spaceborne optical remote sensor is facilitated.

Description

technical field [0001] The invention relates to the technical field of aerospace optical remote sensors, in particular to a novel spaceborne two-dimensional pointing mechanism with high precision and high stability. Background technique [0002] With the gradual expansion of the application field of aerospace optical remote sensors, the functional requirements for aerospace optical remote sensors are becoming more and more diversified, and the performance requirements of its components are becoming more and more refined. For the step staring imaging optical remote sensor, it is necessary to set up a two-dimensional pointing mechanism to realize the capture or tracking of the object through the multi-degree-of-freedom movement of the load. [0003] At present, the two-dimensional pointing mechanism on the space optical remote sensor decomposes the two-dimensional motion of the pointing mirror into one-dimensional motion of two orthogonal rotation axes, and uses the drive of t...

AI Technical Summary

Problems solved by technology

[0003] At present, the two-dimensional pointing mechanism on the space optical remote sensor decomposes the two-dimensional motion of the pointing mirror into one-dimensional motion of two orthogonal rotation axes, and uses the drive of torque motor to realize the rotation motion of each rotation axis, and adopts resolver or induction synchronization The sensor is used as a goniometric element to measure the rotation angle of the rotating shaft as a position feedback signal for closed-loop control. The torque motor needs to adjust the angular position of the pointing mirror in real time according to the feedback signal of the goniometric element, so that the pointing mirror is in the measuring position during the real-time adjustment process The fast swing state within the measurement accuracy range of the angular element, so the stability of the pointing mirror is relatively low

Often in order to eliminate the instability of the pointing mirror, the control system is set to adjust the angle of the torque motor for a limited number of times in real time, which causes the problem of low pointing accuracy

This type of pointing mechanism is difficult to meet the index requirements of high pointing accuracy and high stability

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