Pointing control design for a high precision flight telescope using quantitative feedback theory

Quantitative Feedback Theory and Its Application in UAV’s Flight Control

Quantitative feedback theory (hereafter referred as QFT), developed by Isaac Horowitz (Horowitz, 1963; Horowitz and Sidi, 1972), is a frequency domain technique utilizing the Nichols chart in order to achieve a desired robust design over a specified region of plant uncertainty. Desired time-domain responses are transformed into frequency domain tolerances, which lead to bounds (or constraints) ...

On High Bandwidth Output Pressure Control Design of Hydraulic Actuators Using Quantitative Feedback Theory

Although high bandwidth for the pressure tracking of hydraulic actuators is highly desirable in many industrial applications, it has been a challenge to achieve, mainly due to the natural velocity feedback path in these actuators. In this paper, we investigate the extent to which a fixed-gain linear controller designed based on quantitative feedback theory (QFT) can improve the pressure trackin...

Unmanned Research Vehicle (urv): Development, Implementation, & Flight Test of a Mimo Digital Flight Control System Designed Using Quantitative Feedback Theory

The Quantitative Feedback Theory (QFT) design technique, which has the ability to bridge the gap between theory and the real-world control design problem, is utilized in the design of a MIMO digital flight control system for an unmanned research vehicle (URV) that is presented in this paper. The design illustrates how the “real-world” knowledge of the plant to be controlled and the desired perf...

Adaptive Pointing – Design and Evaluation of a Precision Enhancing Technique for Absolute Pointing DevicesAdaptive Pointing – Design and Evaluation of a Precision Enhancing Technique for Absolute Pointing Devices

We present Adaptive Pointing, a novel approach to addressing the common problem of accuracy when using absolute pointing devices for distant interaction. First, we discuss extensively some related work concerning the problem-domain of pointing accuracy when using absolute or relative pointing devices. As a result, we introduce a novel classification scheme to more clearly discriminate between d...

Effect of magnification on the precision of indoor telescope pointing.