Application of State-Variable and Conditional Feedback Methods Toward Reducing the Pointing Error of a Two-Axis Beam Deflector

摘要

The base motion disturbance error and dynamic tracking error of a two-gimbal planar-mirror optical tracking system are reduced by application of modified conditional feedback compensation and by conventional state-variable feedback. A general procedure is developed for application of state-variable feedback to other tracking systems having base motion disturbance, such as gimbaled airborne-radar control systems. The procedure provides a direct mathematical relationship between the base motion disturbance transfer function, the control ratio, and the system type. A Type 4 system is achieved by application of the method to the optical tracking system. A simple graphical approximation procedure is developed for evaluating rms error from mean-square integrals involving high order power spectral densities. (Author)