A laboratory simulation of a single-axis dual-level precision pointing system
National Aeronautics and Space Administration, 1973 - Nature - 34 pages
The laboratory simulation of a scaled single-axis dual-level control system for a large space telescope is demonstrated. The dual-level control system consists of a coarse-body-pointing system and a fine-pointing system, which uses an image motion compensator, an image dissector tube, and digital electronics. The results of the simulation indicate that the dual-level system can be used to provide tracking capability within one-tenth of a diffraction-limited image diameter of a 3-meter f/100 telescope for stars up to a 12.3 visual magnitude.
What people are saying - Write a review
We haven't found any reviews in the usual places.
12.3 magnitude 13.35 magnitude star 80:1 gear head amplitude and frequency arc sec arc second beam splitter coarse system control moment gyro diameter of 107 digital computer disturbance torque driven sinusoidally dual-level control system dual-level system electron image electronic window error scaling technique error signal field of view Figure 18 fine-pointing control system Fine-pointing sensor fine-pointing system focal plane gyro damping gyro gimbals image diameter image dissector image motion compensator Image position error Image stability IMC mirror position indicated amplitude laboratory simulation Langley Research Center logic gates momentum storage capability NASA TN noise Ostroff output peak to peak photomultiplier tubes radian runs Schmitt trigger sec Figure servomotor shown in figure shows the results Simplified block diagram sinusoidally at indicated star position star sensor star with image system being driven system pointing Telescope position threshold level trace U.S. Customary Units unscaled Vehicle inertia simulator visual magnitude