Staring Imaging Real-Time Optimal Control Based on Neural Network

Abstract

In this paper, a real-time optimal attitude controller is designed for staring imaging, and the output command is based on future prediction. First, the mathematical model of staring imaging is established. Then, the structure of the optimal attitude controller is designed. The controller consists of a preprocessing algorithm and a neural network. Constructing the neural network requires training samples generated by optimization. The objective function in the optimization method takes the future control effect into account. The neural network is trained after sample creation to achieve real-time optimal control. Compared with the PID (proportional-integral-derivative) controller with the best combination of parameters, the neural network controller achieves better attitude pointing accuracy and pointing stability.

Staring Imaging Attitude Tracking Control Laws for Video Satellites Based on Image Information by Hyperbolic Tangent Fuzzy Sliding Mode Control

“…Much research work has been done on the attitude tracking control for the satellites. Meanwhile, some controllers have been employed in satellites attitude control, such as sliding mode controller, robust controller, and intelligent controller [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34].…”

“…So far, compared with attitude tracking and control for spacecraft and satellites, several satellite staring attitude control methods have been introduced to achieve real-time tracking [24][25][26][27][28][29][30][31][32]. For instance, Lian et al [27] investigated the small satellite attitude problems for staring operation.…”

“…In Ref. [ 31 ], Li and Liang proposed a robust finite-time controller aiming at satellite attitude maneuvers to demonstrate the robustness of some typical perturbations such as disturbance torque, model uncertainty, and actuator error. Li et al [ 32 ] implemented the neural network controller for staring imaging, where the real-time performance can be achieved.…”

Spacecraft Staring Attitude Control for Ground Targets Using an Uncalibrated Camera

“…Ref. [11] realizes a similar real-time optimal control method with an emphasis on the pointing accuracy. However, the above studies have not considered the image feedback, though the image error directly and precisely reflects the controller's accuracy.…”