Image Stabilization Performance Optimization Using an Optical Reference Gyroscope

摘要

An optical reference gyroscope (ORG) provides an inertially stabilized collimatedoptical reference beam, which, in conjunction with a fast steering mirror (FSM), allows for closed-loop control image stabilization. Feedback-control permits attenuation in the image space of base motion disturbances which would tend to distort and shift the image at the focal plane. Transfer function derivations for the components and system yield the detector and image error equations. A numerical parametric study of the compensator design seeks to minimize the image error, taking into account ORG noise, base motion power spectra and ORG base-to-rotor coupling effects. A Fourier spectrum analysis of the remaining image error helps to predict the contributions to scene shift and distortion at the focal plane and the resulting image quality degradation at the charged-coupled-device imager. Analytical results are compared with test results.