1988 Technical Papers

A Modular Positioner Control System

Author: William L. Tuttle
Publication: AMTA 1988
Copyright Owner: NSI-MI Technologies

A variety of positioner control systems are available for making antenna and RCS measurements, but few can be upgraded economically as test facilities are expanded. Positioner control system components may include a controller, positioner motor drive unit, and a position indicator. Integration of these functional components into a single modular unit to operate the desired number of axes provides the basis for a positioner control system. Other desired features may include programmability, remotability, operation outdoors, and expansion capability.

This paper will address the development of a modular positioner control system that provides users with a basic system that can economically be upgraded as changing test requirements dictate. Functional capabilities such as remotability will be highlighted. System configuration and integration will also be discussed.

A Serrated-Edge Virtual Vertex Compact Range Reflector

Author: Doren W. Hess
Publication: AMTA 1988
Copyright Owner: NSI-MI Technologies

In this presentation we consider the features and performance of a large serrated-edge compact range reflector. This is a straightforward innovation from earlier compact range reflectors. The virtual vertex reflector is a paraboloidal surface truncated to exclude the vertex. This layout provides the advantages of better use of reflector surface are, reduced feed blockage, and reduced feed backscatter. The design is made economical by the use of serrations.