The FPGA implementation of IP core of PD attitude controller for small satellites

In the sight of the higher requirement about operation speed and control accuracy in satellite attitude control system, this paper analyzed the feasibility of PD attitude controller by using FPGA, and proposed a method using the input enable and the output control symbol to dominate the internal calculation module to figure out the problem of data synchronization. The paper used hardware description language to achieve the function of each module, and finally instantiated the IP core of PD controller. The result shows that the design is able to accomplish the calculation of attitude control torque by only using 34 clock pulses and the accuracy of control can reach 10^-5 magnitude. The speed and accuracy meet the needs of the modern small satellite control system and lay the foundation for using FPGA implementation in small satellite attitude control system.