Research on High Precision Permanent Magnet Servo Control System of Airborne Stable Platform

At present, airborne optoelectronic pod system develops rapidly and is widely used in military and civil fields. The stable platform control system is the key part of the photoelectric pod, which is used to isolate the disturbance of the body and the external environment, maintain the stability of the LOS and ensure the clear imaging of the sensor. In general, the model of airborne electro-optical stabilization platform can not be obtained accurately, and the characteristics of the system itself are affected by the external environment. At the same time, the noise interference such as torque and sensor actuator is also uncertain. In order to solve the above-mentioned uncertainty and improve the stability accuracy of the system, this paper takes the servo system of a two axis airborne photoelectric stability platform as the research object, uses SVPWM technology to complete the hardware and software design with DSP + FPGA as the control core, uses FOG and POS as speed and position sensors. And it aims at mechanical resonance, to design a digital notch filter to restrain it. Finally, the experiment shows that when the swing amplitude is 8.5°, frequency is 0.3Hz, the stability accuracy reaches 0.005° ( $3\sigma$ ). The experiment shows that the stable platform control system has the advantages of fast response speed and high stability accuracy.