Briefs: Software
Distributing Data to Hand-Held Devices in a Wireless Network

ADROIT is a developmental computer program for real-time distribution of complex data streams for display on Web-enabled, portable terminals held by members of an operational team of a spacecraft-command- and-control center who may be located away from the center. Examples of such...

Briefs: Information Technology

A method of incorporating information, acquired by a multibeam laser or radar altimeter system, pertaining to the distance and direction between the system and a nearby target...

Briefs: Information Technology
MODIS Atmospheric Data Handler

A number of science data sets are derived from the observations of the Moderate Resolution Imaging Spectroradiometer (MODIS) instrument onboard NASA’s Terra and Aqua satellites. These data typically contain information on retrieval techniques, quality-control flags, and geo-referencing information. These...

Briefs: Information Technology
Reducing Surface Clutter in Cloud Profiling Radar Data

An algorithm has been devised to reduce ground clutter in the data products of the CloudSat Cloud Profiling Radar (CPR), which is a nadir-looking radar instrument, in orbit around the Earth, that measures power backscattered by clouds as a function of distance from the instrument. Ground...

Briefs: Semiconductors & ICs

Prototype logic gates made of n-channel junction field-effect transistors (JFETs) and epitaxial resistors have been demonstrated, with a view toward eventual implementation of...

Briefs: Electronics & Computers
Spaceborne Hybrid-FPGA System for Processing FTIR Data

Progress has been made in a continuing effort to develop a spaceborne computer system for processing readout data from a Fourier-transform infrared (FTIR) spectrometer to reduce the volume of data transmitted to Earth. The approach followed in this effort, oriented toward reducing design...

Briefs: Electronics & Computers
FPGA Coprocessor for Accelerated Classification of Images

An effort related to that described in the preceding article focuses on developing a spaceborne processing platform for fast and accurate onboard classification of image data, a critical part of modern satellite image processing. The approach again has been to exploit the versatility of...

Briefs: Electronics & Computers
SiC JFET Transistor Circuit Model for Extreme Temperature Range

A technique for simulating extreme-temperature operation of integrated circuits that incorporate silicon carbide (SiC) junction field-effect transistors (JFETs) has been developed. The technique involves modification of NGSPICE, which is an open-source version of the popular...

Briefs: Electronics & Computers

In an alternative to a prior technique of time-domain- reflectometry (TDR) in which very short excitation pulses are used, the pulses have very short rise and fall times and the pulse...

Articles: Electronics & Computers

Companies are constantly looking for ways to monitor and track the critical device information that resides in their remote assets. They also need to understand the environments in which their devices...

Briefs: Electronics & Computers
Update on Development of SiC Multi-Chip Power Modules

Progress has been made in a continuing effort to develop multi-chip power modules (SiC MCPMs). This effort at an earlier stage was reported in “SiC Multi-Chip Power Modules as Power-System Building Blocks” (LEW-18008-1), NASA Tech Briefs, Vol. 31, No. 2 (February 2007), page 28.

Briefs: Electronics & Computers
Radio Ranging System for Guidance of Approaching Spacecraft

A radio communication and ranging system has been proposed for determining the relative position and orientations of two approaching spacecraft to provide guidance for docking maneuvers. On Earth, the system could be used similarly for guiding approaching aircraft and for automated...

Briefs: Electronics & Computers
Improved Short-Circuit Protection for Power Cells in Series

A scheme for protection against short circuits has been devised for series strings of lithium electrochemical cells that contain built-in short-circuit protection devices, which go into a high-resistance, current-limiting state when heated by excessive current. If cells are simply...

Briefs: Electronics & Computers
Communication Limits Due to Photon-Detector Jitter

A theoretical and experimental study was conducted of the limit imposed by photon-detector jitter on the capacity of a pulse-position- modulated optical communication system in which the receiver operates in a photon-counting (weak-signal) regime. Photon-detector jitter is a random delay between...

Briefs: Electronics & Computers
Electromagnetically Clean Solar Arrays

The term “electromagnetically clean solar array” (“EMCSA”) refers to a panel that contains a planar array of solar photovoltaic cells and that, in comparison with a functionally equivalent solar-array panel of a type heretofore used on spacecraft, (1) exhibits less electromagnetic interference to...

Briefs: Manufacturing & Prototyping

A method of (1) sealing a sample of material acquired in a possibly biologically contaminated (“dirty”) environment into a hermetic container, (2) sterilizing the outer surface of...

Briefs: Manufacturing & Prototyping
System for Removing Pollutants From Incinerator Exhaust

A system for removing pollutants — primarily sulfur dioxide and mixed oxides of nitrogen (NOx) — from incinerator exhaust has been demonstrated. The system is also designed secondarily to remove particles, hydrocarbons, and CO. The system is intended for use in an enclosed...

Application Briefs: Sensors/Data Acquisition
Coded optic mask foil
Dynamics Research Corp. (DRC)
Andover, MA

The High Energy Transient Explorer (HETE-2)...

Application Briefs: Communications
System Provides Critical Communications Among Stennis Rocket Test Team Members
Subsystem Multiplexer (Sub-MUX)
Quintron Systems
Santa Maria, CA

NASA has awarded Quintron Systems an Indefinite-Delivery- Indefinite-Quantity (IDIQ) contract, and the first task order is for a command and...

NASA Tech Needs

As NASA evolves its vision for space exploration and Earth science, greater demands are placed on advanced communications...


Keithley Instruments, Cleveland, OH, has introduced the Model 3390 50- MHz arbitrary waveform/function generator, a programmable signal generator with function, pulse, and arbitrary waveform capabilities. Features include 50-MHz...

Who's Who: Aerospace

In March 2008, astronaut Garrett Reisman flew aboard the Space Shuttle Endeavour to the International Space Station, where he spent 95 days living and working in space. After...

Briefs: Software
Converting EOS Data From HDF-EOS to netCDF

A C-language computer program accepts, as input, a set of scientific data and metadata from an Earth Observing System (EOS) satellite and converts the set from (1) the format in which it was created and delivered to (2) another format for processing and exchange of data on Earth. The first-mentioned...

Briefs: Software
HDF-EOS 2 and HDF-EOS 5 Compatibility Library

The HDF-EOS 2 and HDF-EOS 5 Compatibility Library contains C-language functions that provide uniform access to HDF-EOS 2 and HDF-EOS 5 files through one set of application programming interface (API) calls. (“HDF-EOS 2” and “HDF-EOS 5” are defined in the immediately preceding article.)...

Techs for License
Page-Rendering Software for eBooks and Manufacturers

Rapidly evolving eBook technology promises to deliver books, catalogs, newspapers, or magazines anywhere electronically on compact, easy-to-carry readers. eBooks face challenges that physical books do not: file security during transmission, speed of transmission, and the risk of piracy. The...

Techs for License
Anti-Reflective Coating for Films

Able to withstand abrasion even with steel wool, these antireflective coating formulations for display applications offer high durability and reflectivity that ranges from 1.2% down to 0.5%. Reducing ambient light reflectance significantly improves image clarity on LCD and PDP displays and rearprojection...

Briefs: Software
HDF-EOS Web Server

A shell script has been written as a means of automatically making HDF-EOS-formatted data sets available via the World Wide Web. (“HDF-EOS” and variants thereof are defined in the first of the two immediately preceding articles.) The shell script chains together some software tools developed by the Data Usability Group at...

Tech Needs
Masking of Bitter Ingredients

A company seeks technology to mask ingredient bitterness in its oral delivery system. Specifically, it seeks materials and/or methods to increase the ability of their oral delivery mechanism to carry a given ingredient, while removing any associated bitterness. Possible solution areas include masking bitter...

Briefs: Software
HDF-EOS 5 Validator

A computer program partly automates the task of determining whether an HDF-EOS 5 file is valid in that it conforms to specifications for such characteristics as attribute names, dimensionality of data products, and ranges of legal data values. [“HDF-EOS” and variants thereof are defined in “Converting EOS Data From...

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