Spectral Analysis Tool 6.2 is the latest version of a computer program that assists in analysis of interference between radio signals of the types most commonly used in Earth/spacecraft radio communications. [An earlier version was reported in "Software for Analyzing Earth/ Spacecraft Radio Interference" (NPO-20422), NASA Tech Briefs, Vol. 25, No. 4 (April 2001), page 52.] SAT 6.2 calculates signal spectra, bandwidths, and interference effects for several families of modulation schemes. Several types of filters can be modeled, and the program calculates and displays signal spectra after filtering by any of the modeled filters. The program accommodates two simultaneous signals: a desired signal and an interferer. The interference-to-signal power ratio can be calculated for the filtered desired and interfering signals. Bandwidth- occupancy and link-budget calculators are included for the user's convenience. SAT 6.2 has a new software structure and provides a new user interface that is both intuitive and convenient. SAT 6.2 incorporates multi-tasking, multithreaded execution, virtual memory management, and a dynamic link library. SAT 6.2 is designed for use on 32-bit computers employing Microsoft Windows operating systems.
This program was written by Feiming Morgan, Miles Sue, Ted Peng, Harry Tan, and Robert Liang of Caltech and Peter Kinman of California State University, Fresno, for NASA's Jet Propulsion Laboratory. For further information, access the Technical Support Package (TSP) free on-line at www.techbriefs.com/tsp under the Software category.
This software is available for commercial licensing. Please contact Karina Edmonds of the California Institute of Technology at (626) 395-2322. Refer to NPO-43129.
This Brief includes a Technical Support Package (TSP).
Spectral Analysis Tool 6.2 for Windows
(reference NPO-43129) is currently available for download from the TSP library.
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Overview
The document provides a technical support package for the Spectral Analysis Tool (SAT) 6.2, a software application developed by NASA's Jet Propulsion Laboratory (JPL) for assessing radio frequency interference in satellite communication systems. The software is designed for use on 32-bit machines running Microsoft Windows and is aimed at professionals involved in spectrum management and satellite communications.
SAT 6.2 offers a range of unique features that enhance its utility. It includes an editor for both narrowband and wideband modulated signal and interference sources, which can be rendered through simulation or analytical equations. The software also provides bandpass filters and a graphical display of the signal's power spectral density, complete with zooming capabilities. Additionally, it incorporates interactive calculators for bandwidth, power, and link budgets, making it a comprehensive tool for spectrum managers. The software allows for detailed interference analysis, enabling users to select different antennas, amplifiers, and receivers.
Since its inception, SAT 6.2 has undergone significant improvements over previous versions. Notably, since 2000, enhancements have included the addition of analytical graphs for various modulation schemes, the introduction of GMSK modulation, and new filter types such as the Inverse Chebychev and Elliptic filters. These advancements aim to address the challenges of conducting radio frequency interference analysis effectively.
The program accommodates two simultaneous signals: a desired signal and an interferer, allowing users to calculate the interference-to-signal power ratio for both filtered signals. This feature is crucial for understanding the impact of interference on communication quality. The software's new structure and user interface are designed to be intuitive and user-friendly, incorporating multi-tasking, multithreaded execution, virtual memory management, and dynamic link libraries.
The document also emphasizes compliance with U.S. export regulations and includes a disclaimer regarding the proprietary nature of the information contained within. It encourages users to seek further assistance through the NASA Scientific and Technical Information (STI) Program Office and provides contact details for the STI Help Desk.
In summary, the Spectral Analysis Tool 6.2 is a sophisticated software solution that enhances the analysis of radio frequency interference in satellite communications, offering a variety of features and improvements that cater to the needs of spectrum management professionals.
