The Spectral Analysis Tool (SAT) computer program assists in analysis of interference between radio signals in Earth/spacecraft communications. SAT provides an easy-to-use interactive graphical interface with a menu for selecting among the following utility subprograms: an editor for modulated signal and interference sources of various spectral widths, an editor for inserting an interfering sine wave into the spectrum, a filter editor for simulating effects of a band-limited channel, and a graphics editor for viewing and textual editing of power spectra and spectral-density plots. Also provided are calculators for signal and interference bandwidth and power, plus communication-link-budget tables and interference-analysis tables with choices of antennas, amplifiers, and receivers. The main output of SAT comprises data on interference-to-signal power ratios and system losses with respect to interference-free baseline systems. Optionally, SAT generates color or gray-scale spectral plots or information in textual (including tabular) form on results of power calculations, link-budget parameters, or any other parameter(s) of interest. SAT has been written for execution on a desktop computer running the 3.1, NT, or 95 version of the Windows operating system. The complete SAT software package fits on a standard 3.5-in. (8.89-cm) diskette.

This program was written by K. Oudrihiri, K. Angkasa, Leon Truong, E. Kidd, Victor Lo, Mazen Shihabi, F. Chen, J. Rucker, John Gevargiz, and K. Widyono of Caltech for NASA's Jet Propulsion Laboratory. For further information, access the Technical Support Package (TSP) free on-line at  under the Software category.

This software is available for commercial licensing. Please contact Don Hart of the California Institute of Technology at (818) 393-3425. Refer to NPO-20422.

This Brief includes a Technical Support Package (TSP).
Software for Analyzing Earth/Spacecraft Radio Interference

(reference NPO-20422) is currently available for download from the TSP library.

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