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Briefs: Software
Program for Conceptual Design of an Attitude-Control System

A report describes the ACS Design Tool - a Macintosh- and PC-based computer program for evaluating conceptual designs of a spacecraft attitude-control system (ACS) within a computation time of about 15 minutes. Services provided by the program include computation of ACS performance and...

A procedure for determining the location of an instrumentation platform on natural terrain is based on a concept of maximum-likelihood matching of two range maps: (1) a local range...

Briefs: Electronics & Computers
Development of Circuitry for Wristband Radio Transponders

A document proposes the development of several alternative types of electronic circuits for wristband transponders for the system described in "Person-Locator System Based on Wristband Radio Transponders" (NPO-19280) NASA Tech Briefs, Vol. 19, No. 12 (December 1995), page 40. To...

Briefs: Electronics & Computers
Active-Pixel Sensors With "Winner-Take-All" Mode

Circuits to generate the intensity reading and the coordinates of the brightest pixel in each image would be added to imaging photodetector arrays of the active-pixel-sensor (APS) type,...

A program to demonstrate the feasibility of GaAs-based Kₐ-band power amplifiers has generated a number of technological advances. The goals of the program included (1) capability of...

The figure shows a complementary metal oxide/semiconductor (CMOS) integrated circuit that contains all of the electronic circuitry of a programmable active-pixel-sensor digital camera....

Circuits to generate analog or digital representations of the coordinates of the centers of mass of images would be added to imaging photodetector arrays of the active-pixel-sensor...

The Production Support Flight Control Computers (PSFCCs) are flight-control computers that are being developed by NASA in conjunction with the United States Navy. These computers...

A developmental electronic system that includes Global Positioning System (GPS) receivers is designed to track the relative position and velocity to two airplanes in real time. In...

A concept for optimizing the designs of two-wavelength GaAs-based quantum-well infrared photodetectors (QWIPs) could make it practical to use focal-plane arrays of QWIPs as image sensors...

Modules of electronic circuitry that perform the amplitude- and phase-control and the status-monitoring functions for eight-element (2 ×4) subarrays of K-band phased-array antennas...

An information-reduced carrier-synchronization (IRCS) system has been proposed for use in a coded binary-phase-shift-keying (BPSK) radio-communication receiver...

Briefs: Electronics & Computers
Micromachined Magnetostatic Switches

Magnetostatic switches — switches that open or close in response to magnetic fields — are being developed and fabricated using micromachining (MEMS) technology. These switches operate similarly to...

Briefs: Software
Program Computes Equilibrium Compositions of Mixtures

The Chemical Equilibrium with Applications (CEA) computer program is used to obtain chemical-equilibrium compositions of complex mixtures. This program can be applied to a wide variety of problems in chemistry and chemical engineering. Specifically, CEA is applicable to the following kinds of...

Briefs: Information Technology
Robust Aeroservoelastic-Stability Margins

In aeroservoelastic (ASE)-stability analysis, one considers the coupling of the aerodynamic, inertial, structural, actuation, and control-system elements of the dynamics of an aircraft. The...

An algorithm effects rapid initialization of a convolutional decoder. This algorithm can be applied "on the fly"; that is while the decoder is receiving a stream of convolutionally...

An improved method of parallel computation of the electromagnetic-scattering characteristics of complexly shaped objects has been devised. This method belongs to a class of methods...

Briefs: Information Technology
Converting Particle-Fallout Data to Obscuration Levels

A worksheet has been constructed within the Microsoft Excel software system for converting raw particle-fallout data into percentages of obscuration; that is, percentages of areas obscured by particles on surfaces. These obscuration levels are needed for assessing contamination levels in...

The figure illustrates aspects of a proposed switching protocol for optical packet data communication that would serve as an alternative to the older store-and-forward and header-first...

Briefs: Electronics & Computers
Automated Cargo-Tracking Transponders

Credit-card-sized electronic transponders have been proposed for use in tracking cargo anywhere on Earth. A transponder would be carried on a cargo container, where it would act as a "smart tag." The...

The figure schematically illustrates an optoelectronic apparatus that generates both an optical output and an electronic output (typically at frequencies in the range from hundreds...

A process being developed for ultrathin packaging of multiple integrated-circuit chips and associated microelectromechanical components makes it possible to fabricate a minimally...

Focal-plane-array (FPA) hybrids of quantum-well infrared photodetectors (QWIPs) thinned to the membrane level are undergoing development. The developmental QWIPs in question are of...

An electronic engine-health-monitoring system is based on (1) computation of frequency-phase-normalized (FPN) spectra from the digitized outputs of vibration sensors and (2) the use of...

Briefs: Electronics & Computers
Embedded CMOS A/D Converters for High-Speed Operation

Sarnoff Corporation has announced the development of four new analog-to-digital (A/D) converter macro cells for embedding in CMOS designs in which high-precision, high-speed operation at low power is important. The 8-bit, 10-bit, 12-bit, and dual 6-bit designs are available for licensing by...

A proposed improved code-division multiple-access (CDMA) detector would achieve high resistance to jamming of weak ("far") received signals by strong ("near") ones. The problem of such...

Multiple-quantum-well AlxGa1 - xAs photodetectors that exploit transitions of electrons from quantum-well bound states to quasi-bound states are undergoing...

By combining patented digital Silver-in-Glass® and analog conductive plastic technologies in a single environmentally sealed unibody package, Spectrol Electronics' DigiSense™...

Briefs: Electronics & Computers
"Smart" Camera for Precise Mapping and Targeting

A "smart" video camera, called the "GI-Eye," generates digital image data that are automatically tagged with georegistration meta-data to indicate the precise position and attitude of the...

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