Institute for Telecommunication Sciences
the research laboratory of the National Telecommunications and Information Administration

Larry G. Hause

Abstract: This report describes the mathematical models used in the ARROWS programs. These programs, which run on a desktop computer, automate the calculations involved in the design of line–of–sight microwave radio relay links. The programs calculate, tabulate, and plot information about Earth geometry, terrain profiles, ray paths, repeater–reflector geometry, median basic transmission loss, variab1ility of loss, equipment effects, and link performance. Each model is selected on the basis of its acceptance within the communications industry and the size and type of data base supporting the model. The computer hardware and software configurations are designed to be convenient to operate and to give the design engineer immediate access to calculated results corresponding to changes in design parameters. The programs corresponding to these algorithms are designed to be used interactively by persons having no experience in programming. The algorithms are applicable over a wide range of link parameters. The frequency range is from 1 GHz to 20 GHz. Path lengths should be less than 150 km.

Keywords: computer software; digital radio; microwave radio; passive repeater; radio link performance; radio relay


To request a reprint of this report, contact:

Lilli Segre, Publications Officer
Institute for Telecommunication Sciences
(303) 497-3572
lsegre@ntia.doc.gov


Disclaimer: Certain commercial equipment, components, and software may be identified in this report to specify adequately the technical aspects of the reported results. In no case does such identification imply recommendation or endorsement by the National Telecommunications and Information Administration, nor does it imply that the equipment or software identified is necessarily the best available for the particular application or uses.

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