Designs And Researches On The Servo Loop Of Inertial Platform

The inertial navigation system is needed in the development of navigation and aviation, the stabilized platform is one of the most important part in the navigation system which determines the precision.The servo loop is a position stabilization loop of the platform. Revise loop help it to command the platform into alignment with the local present coordinate system. Generally speaking, a gyro is used to measure the error between the platform and the local present coordinate system, the error signal then go through the AC enlargement, mode sensitive demodulation, DC enlargement and adjustment, PWM and power amplification. Then final signal drives the electrical machinery to force the platform to turn to the local present coordinate system. The paper at the first set up the control model of the close-loop through the experiment testing, and then designs and realizes a lead-lag controller. The solution combines classical PID law with analogue electronic system is now a mature technology, this paper analysis this technology in theory and experimentation, the result argues that this technology is feasible.But analog control system has some shortcomings: complexity, unhandy, and so on. The digital control system based on Digital Signal Processor (DSP) can overcomes these shortcomings effectively. The paper displayed the application of DSP in the servo loop in the end.