Flexible Structures Identification for Mobile Satcom Antenna Servo Systems

With the requirements of antenna pointing accuracy increasing, the high frequency flexible characteristics have become the important factor of limiting the control performance for antenna servo systems. In this paper, an identification method is given to identify the mobile satcom antenna (MSCA) servo system with flexible structure. Using PRBS as the input signal, the impulse response is acquired based on correlation analysis; the state space model is derived from the impulse response through singular value decomposition; and a frequency domain model with explicit flexible parameters is obtained by parameters fitting. This method can intuitively determine the system order, is feasible to be applied to MIMO system. In addition, compared with some traditional identification methods, the experimental results show that this method is able to achieve higher accuracy in flexible structure identification work for electromechanical systems.