Rotation control method and device for coarse pointing device for space optical communication

Abstract

The invention discloses a rotation control method and device for a rough pointing device used in space optical communication. The method includes: S1, obtaining the path curve of the coarse pointing device from the current position angle to the target position angle; S2, discretizing the path curve with the control period as the sampling period, decomposing to obtain the target angle corresponding to each control period; S3 Control the coarse pointing device to rotate to the target position angle until the actual position angle of the coarse pointing device is equal to the target position angle, and control the coarse pointing device to rotate to the target angle corresponding to the control cycle in each control cycle during the rotation process. Make the coarse pointing device stably follow the planned path curve to rotate to the target position angle, and constrain the angular velocity and angular acceleration, which can greatly reduce the jitter and power fluctuations generated when the laser communication coarse pointing device is working, so as to ensure the control of the entire star Stability and reduce the impact on the power supply, reducing the power consumption of the satellite.

Description

technical field [0001] The invention relates to the field of space laser communication, in particular to a rotation control method and device for a coarse pointing device used for space optical communication. Background technique [0002] The key to whether the optical link of space optical communication can be successfully established and maintained lies in the stability and accuracy of the coarse pointing device. At the beginning of the establishment of the optical link, the main control unit should control the device to point to the target according to the space position of the target satellite. This process is called pre-pointing; due to the limited accuracy of satellite automatic control, there will be a certain error in the pre-pointing. In order to compensate for the pre-pointing error, it is necessary to Helical scanning in the uncertainty field with a coarse pointing device to quickly capture the target satellite. [0003] At present, the control of the coarse poin...

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Problems solved by technology

[0003] At present, the control of the coarse pointing device uses three closed-loop control of the motor, including the current loop, the speed loop, and the position loop. In the process of pre-pointing and helical scanning, if the target pointing or the target node angle of the helical scanning is directly used for calculation and control command, the controller will quickly respond to the target position, but the response path curve is out of control. If the gap between the target pointing angle and the current angle of the actuator is too large, the angle will change sharply in a short period of time, resulting in acceleration peaks, Unstable factors such as current peak

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