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Briefs: Information Technology
Capacity Maximizing Constellations

Some non-traditional signal constellations have been proposed for transmission of data over the Additive White Gaussian Noise (AWGN) channel using such    channel-capacity-approaching codes as low-density...

Briefs: Information Technology
Processing Images of Craters for Spacecraft Navigation

A crater-detection algorithm has been conceived to enable automation of what, heretofore, have been manual processes for utilizing images of craters on a celestial body as landmarks for...

Briefs: Information Technology
Software Tool Integrating Data Flow Diagrams and Petri Nets

Data Flow Diagram – Petri Net (DFPN) is a software tool for analyzing other software to be developed. The full name of this program reflects its design, which combines the benefit of...

Briefs: Information Technology
Reducing the Volume of NASA Earth-Science Data

A computer program reduces data generated by NASA Earth-science missions into representative clusters characterized by centroids and membership information, thereby reducing the large volume of data...

Briefs: Information Technology
AutoGen Version 5.0

Version 5.0 of the AutoGen software has been released. Previous versions, variously denoted “Autogen” and “autogen,” were reported in two articles: “Automated Sequence Generation Process and Software” (NPO-30746),...

Briefs: Information Technology
Time-Tag Generation Script

Time-Tag Generation Script (TTaGS) is an application program, written in the AWK scripting language, for generating commands for aiming one Ku-band antenna and two S-band antennas for communicating with spacecraft....

Briefs: Information Technology
Tropospheric Emission Spectrometer Product File Readers

TES Product File Reader software extracts data from publicly available Tropospheric Emission Spectrometer (TES) HDF (Hierarchical Data Format) product data files using publicly available...

Briefs: Information Technology
Reporting Differences Between Spacecraft Sequence Files

A suite of computer programs, called “seq diff suite,” reports differences between the products of other computer programs involved in the generation of sequences of commands for...

Briefs: Information Technology
Performance Bounds on Two Concatenated, Interleaved Codes

A method has been developed of computing bounds on the performance of a code comprised of two linear binary codes generated by two encoders serially concatenated through an interleaver....

Briefs: Information Technology
Mission Reliability Estimation for Repairable Robot Teams

A mission reliability estimation method has been designed to translate mission requirements into choices of robot modules in order to configure a multi-robot team to have high reliability...

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