Accession Number : ADP006188

Title :   TROPO: A Technique for Predicting Propagation and Modem Performance of Digital Troposcatter Systems,

Corporate Author : SIGNATRON INC LEXINGTON MA

Personal Author(s) : Parl, Steen A.

Report Date : SEP 1989

Pagination or Media Count : 9

Abstract : In this paper we present the capabilities of a PC-based decision aid for digital troposcatter link engineering. The program includes propagation effects such as multipath and spatial diversity, as well as adaptive modem performance, transmitter emission control filtering, etc. The model uses the existing NBS method for predicting long term effects and for short-term effect below 1 GHz. Above 1 GHz it uses a turbulent volume scattering model. It uses numerical integration whenever possible to avoid coarse analytical approximations. A key function is its ability to evaluate advanced diversity receiver and modem techniques. A predecessor of this program has been used by the USAF to evaluate and engineer current and planned digital troposcatter links. The objective of this software program is to provide a tool for troposcatter link design, diversity design, and for analysis of existing links. The program is intended to be as precise as possible in the link and modem characterization as well as in the numerical algorithms used. It is felt that this will reduce a significant part of the uncertainty in link prediction. There is some evidence that the model provides reliable predictions with less margin for prediction errors.

Descriptors :   *COMPUTER PROGRAMS, *DECISION AIDS, *ELECTROMAGNETIC SCATTERING, *PREDICTIONS, MODEMS, DIGITAL SYSTEMS.

Subject Categories : Computer Programming and Software
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE