Design of digital 2DOF servo system of shipboard tracking radar

All-digital servo system of shipboard tracking radar based on 2DOF (two degrees of freedom) system theory is designed in the paper. The paper puts forward a method of obtaining the feedforward controller of the two degrees of freedom system based on the step response curve of one degree of freedom system. The mathematical model of the servo system is established using MATLAB/Simulink, the two degrees of freedom velocity loop is designed, and the simulation results show that two degrees of freedom controller structure has significant role of enhancing the dynamic performance of the velocity loop, sensitivity function analysis verifies the robustness of the velocity loop. The hardware and software design of the servo system are Completed based on TMS320F28335 DSP, FOG (Fiber Optic Gyroscope) serves as inertial angular rate sensor of the velocity loop, the digital current loop is realized. Isolation experiment and tracking simulated moving target experiment are carried out, the experimental results show that the servo system has good dynamic performance and good disturbance attenuation capability.