Tech Briefs

libSPRITE

Marshall Space Flight Center, Alabama libSPRITE is a set of software libraries used in the development of software applications. The libraries provide components for encoding engineering units, math functions, a task scheduler built on top of pthreads, a publish/subscribe data distribution system, and a Lua scripting language interface.

Posted in: Briefs, Software

Read More >>

Tool for Rapid Analysis of Monte Carlo (TRAM) Simulation Data

This tool can be used in any engineering industry that uses Monte Carlo simulations as part of a design and analysis process. Lyndon B. Johnson Space Center, Houston, Texas Spacecraft design is inherently difficult due to the complexity of the systems involved and the expense of testing hardware in a realistic environment. The number and cost of flight tests can be reduced by performing extensive simulation and analysis studies to understand vehicle operating limits and identify circumstances that lead to mission failure. A Monte Carlo simulation approach that varies a wide range of parameters is typically used to generate a large set of test scenarios. The results of these analyses bound the vehicle performance and eventually help certify a spacecraft for flight.

Posted in: Briefs, Software

Read More >>

Object-Oriented FITS File Interface for MATLAB

Goddard Space Flight Center, Greenbelt, Maryland The ability to read complicated Flexible Image Transport System (FITS) files in MATLAB was required for analyzing data from the Integrated Science Instrument Module (ISIM) cryovac test campaign for the James Webb Space Telescope (JWST) project. This software was written to fill that specific need, but is more generally applicable.

Posted in: Briefs, Software

Read More >>

Space Station Research Explorer

This program presents experiments, facilities, and research results from the International Space Station in formats that could be easily understood by a wide audience. Lyndon B. Johnson Space Center, Houston, Texas The Space Station Research Explorer provides current information on International Space Station (ISS) experiments, facilities, and research results through video, photos, interactive media, and in-depth descriptions on iOS and Android devices.

Posted in: Briefs, Software

Read More >>

Integrated Circuit for Radio Astronomy Correlators Supporting Large Arrays of Antennas

NASA’s Jet Propulsion Laboratory, Pasadena, California Radio telescopes that employ arrays of many antennas are in operation, and ever-larger ones are being designed and proposed. Signals from the antennas are combined by cross-correlation. While the cost of most components of the telescope is proportional to the number of antennas, N, the cost and power consumption of cross-correlation are proportional to N2, and dominate at sufficiently large N. As radio telescopes get larger, there is a need to provide digital-signal-processing electronics that are smaller and less power-hungry than would be implied by the extrapolation of existing designs.

Posted in: Briefs, Electronics & Computers, Software

Read More >>

Fabrication of Silicon-Leg Isolated Bi-Cr Thermopiles

Goddard Space Flight Center, Greenbelt, Maryland The objective of this innovation was to develop a methodology of fabricating thermopile detectors using standard semiconductor fabrication techniques. The goal was to develop a fabrication process that minimized the roughening of the Si legs during patterning of the metallic couples, and to enable delineation of the Si legs without the use of highly toxic or carcinogenic chemicals. Another key requirement was at least 50% optical absorbance across the spectral band.

Posted in: Briefs, Electronics & Computers

Read More >>

Current Source Logic Gate

John H. Glenn Research Center, Cleveland, Ohio High-temperature electronic integrated circuits have been demonstrated in silicon carbide (SiC) depletion mode MESFETs. This process is only capable of producing depletion mode n-channel MESFET transistors. With only this type of transistor, designing a logic gate is a challenge. A previous logic gate design that can be constructed in the current process has performed well. This invention improves upon the previous design by increasing output voltage range and decreasing the physical layout size of a logic gate. This logic gate circuit consists of depletion mode MESFET/JFET transistors and resistors that can be constructed with SiC depletion mode n-channel MESFETs.

Posted in: Briefs, Electronics & Computers

Read More >>

The U.S. Government does not endorse any commercial product, process, or activity identified on this web site.