title: Two-axis manual positioning and tracking controls.
abstract: In this article, the author examines the characteristics of joysticks and trackballs, two of the more common controls used for positioning tasks, such as occur with radar or some computer displays, and for continuous tracking tasks such as vehicle steering or weapon aiming. Results are given of a number of tests with digital positioning controls, and the author discusses the prediction of operator performance on tracking tasks, also the use of 'aiding' circuits to increase control response.
authors.affiliation: Measurement Systems Inc, Norwalk, Connecticut, USA.
authors.forename: M H
authors.initials: MH
authors.lastname: Mehr