Accession Number : ADA258863


Title :   Image Stabilization Performance Optimization Using an Optical Reference Gyroscope


Descriptive Note : Master's thesis


Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE


Personal Author(s) : Hammann, Jefferey T


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a258863.pdf


Report Date : May 1992


Pagination or Media Count : 81


Abstract : An optical reference gyroscope (ORG) provides an inertially stabilized collimated optical 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.


Descriptors :   *OPTIMIZATION , *OPTICAL IMAGES , *GYROSCOPES , *STABILIZATION SYSTEMS , TEST AND EVALUATION , STABILIZATION , MIRRORS , TRANSFER FUNCTIONS , DEGRADATION , THESES , QUALITY , EQUATIONS , TRANSFER , NOISE , POWER , ATTENUATION , YIELD , ERRORS , IMAGES , FEEDBACK , COLLIMATORS , COMPENSATORS , COUPLINGS , CLOSED LOOP SYSTEMS , SPECTRUM ANALYSIS , DISTORTION , LOOPS , ROTORS , FOCAL PLANES , SPECTRA , POWER SPECTRA , MOTION , DETECTORS , CONTROL , FUNCTIONS , STEERING


Subject Categories : Numerical Mathematics
      Optics


Distribution Statement : APPROVED FOR PUBLIC RELEASE