Steve Gibson, Tsu-Chin Tsao, Dan Herrick, Christopher Beairsto, Ronnie Grimes, Todd Harper, Jeff Radtke, Benito Roybal, Jay Spray, Stephen Squires, Dave Tellez, Michael Thurston
KEYWORDS: Adaptive control, Digital signal processing, Telescopes, Digital filtering, Electroluminescence, Cameras, Line of sight stabilization, Missiles, Feedback control, Optical filters
A field test experiment on a range tracking telescope at the U. S. Army's White Sands Missile Range is exploring
the use of recently developed adaptive control methods to minimize track loop jitter. Gimbal and platform
vibration are the main sources of jitter in the experiments, although atmospheric turbulence also is a factor. In
initial experiments, the adaptive controller reduced the track loop jitter significantly in frequency ranges beyond
the bandwidth of the existing track loop. This paper presents some of the initial experimental results along with
analysis of the performance of the adaptive control loop. The paper also describes the adaptive control scheme,
its implementation on the WSMR telescope and the system identification required for adaptive control.
This paper presents a new approach to closed-loop control of optical jitter with a new liquid crystal beam steering
device. In contrast to conventional fast steering mirrors, where the laser beam is reflected of the controlled mirror
surface, the transmissive liquid crystal beam steering device optically redirects the laser beam. The new device
has no moving parts and requires low operating power. This research suggest the new device can replace the fast
steering mirrors in a variety of electro-optic systems. The functionality of the transmissive liquid crystal beam
steering device along with the analysis of real-time adaptive control experiments are described in this paper. The
experimental results show that the new liquid crystal beam steering device can reject disturbances with an LTI
feedback controller, and that the disturbance rejection capability can be improved significantly with feedforward
adaptive control.
Conference Committee Involvement (2)
Acquisition, Tracking, Pointing, and Laser Systems Technologies XXVI
23 April 2012 | Baltimore, Maryland, United States
Acquisition, Tracking, Pointing, and Laser Systems Technologies XXV
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