Stories
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Briefs: Electronics & Computers
A proposed system for simultaneous characterization of the instability of several precise, low-noise oscillators of nominally equal frequency would be built around a commercially...
Briefs: Electronics & Computers
A proposed digital carrier-signal-tracking loop in a radio transponder could be programmed to operate in either a perfect-integration or an imperfect-integration mode. Although originally...
Briefs: Electronics & Computers
An improved design for a conical log-spiral antenna (see Figure 1) simplifies construction and improves alignment. The radiating-element substructure of such an antenna must be properly...
Briefs: Electronics & Computers
A novel micromachined incandescent light source has been designed and fabricated to operate at temperatures exceeding 2,500 K. The high-temperature, tungsten filament-based source has a high-brightness,...
Briefs: Electronics & Computers
Automatic Bias Compensation in GPS Receivers
A technique of automatic bias compensation has been devised to correct errors caused by variations among electronic components in Global Positioning System (GPS) receivers that use the coarse/acquisition (C/A) GPS code. Even though there are large government and commercial markets for such GPS receivers,...
Briefs: Electronics & Computers
Theoretical calculations verified by experiments have shown that suitably designed ribbons made of alumina can serve as low-loss dielectric waveguides for electromagnetic radiation at...
Briefs: Electronics & Computers
Complementary metal oxide/semiconductor (CMOS) image sensors would be capable of operation in a time-delayed-integration (TDI) mode. Heretofore, the only semiconductor electronic image...
Briefs: Electronics & Computers
Acquisition, Tracking, and Pointing in Optical Communication
A document in the form of lecture slides outlines a program of development of capabilities for acquisition of signals, tracking of signal sources, and pointing of transmitters and receivers in deep-space optical communications. Topics addressed on the first few slides include the...
Briefs: Electronics & Computers
In a scheme to increase the overall data return from a phase-modulation, suppressed-carrier telemetry transmitter, the telemetry playback symbol rate is adjusted essentially...
Briefs: Electronics & Computers
An improved Global Positioning System (GPS) receiver, which processes an encrypted P-code signal without knowledge of the encryption code (denoted here as A-codeless mode), includes an auxiliary antenna...
Briefs: Electronics & Computers
Low-Power, Sparse-Sampling GPS Receiver
The term "microGPS" denotes a Global Positioning System (GPS) receiver design concept that combines relatively simple, lightweight, low-power-consumption hardware with portable, efficient software. The power demand of a microGPS receiver can be made low because it is designed to sample sparsely; that is, to...
Briefs: Electronics & Computers
Software for Analyzing Telecommunication Link Performance
The Telecom Forecaster Predictor (TFP) is a multi-mission computer program for analyzing deep space telecommunication links. Analysts use the TFP for link planning, performance prediction, and post-pass trending analysis. For each mission, multiple users access a controlled set of TFP...
Briefs: Electronics & Computers
The Autogenic Clinical/Lab System (ACLS) is a personal-computer-based instrumentation system for physiological training. This system can be used to implement a program of multiparameter...
Briefs: Electronics & Computers
Very-large-scale integrated (VLSI) circuits containing electronically reconfigurable arrays of transistors have been proposed as means to implement a forthcoming generation of a...
Briefs: Electronics & Computers
A proposed active tactile display device would present textual and graphical information to a blind person. The concept of this device is a byproduct of recent research on the use of...
Briefs: Electronics & Computers
System for Monitoring the Environment of a Spacecraft Launch
A system that includes sensors and computers that communicate via an intranet enables both real-time monitoring and subsequent analysis of acoustic, overpressure, and thermal aspects of a spacecraft-launch environment and the structural response (vibration and strain) to that...
Briefs: Electronics & Computers
A heterodyne optical interferometer of a type used to measure small displacements can be augmented to suppress a phenomenon, called "self-interference," that tends to limit the achievable...
Briefs: Electronics & Computers
Storage batteries based on intercalation of lithium and bromine in graphite have been proposed. Like other storage batteries, these could be recharged electrically. Optionally, these...
Briefs: Electronics & Computers
Signal Processor for Doppler Measurements in Icing Research
An advanced signal processor has been developed to enable high-resolution measurement of the frequency and phase shifts of noisy laser Doppler velocimeter (LDV) and phase Doppler particle analyzer (PDPA) signals. The purpose of the measurements is to exploit the phase Doppler principle to...
Briefs: Electronics & Computers
An experimental traveling-wave photomixing device generates narrow-band electromagnetic radiation at frequencies up to a few terahertz. The device is, potentially, a prototype of...
Briefs: Electronics & Computers
A proposed monolithic planar array of miniature dipole antennas, diodes, and associated input/output circuitry would serve as a prototype of image sensors for submillimeter-wavelength video cameras (see Figure...
Briefs: Electronics & Computers
A special-purpose communications subsystem provides a push-to-talk signal to a communication system as if the individual was directly wired to the system. The subsystem also permits...
Briefs: Electronics & Computers
A three-stage power amplifier has been developed, capable of operating without tuning, over a wide frequency band ranging well above 100 GHz. The original intended application of this...
Briefs: Electronics & Computers
A humidity interlock has been developed to prevent damage that could be caused by condensation of water on a delicate and expensive laser crystal that must be maintained at a temperature...
Briefs: Electronics & Computers
The Kennedy Space Center (KSC) Simulation System is a computing system capable of large-scale mathematical modeling for real-time simulation of the behavior of a complex system that could include many different...
Briefs: Electronics & Computers
Small electric power cells based on the direct conversion of kinetic energy of alpha particles into electricity have been proposed. These cells are expected to function continuously over...
Briefs: Electronics & Computers
"PR-2" denotes a proposed spaceborne radar system for measuring three-dimensional rainfall profiles and rainfall velocities. The PR-2 system would incorporate a number of...
Briefs: Electronics & Computers
A system for determining the locations of nearby lightning strikes from electric-field and acoustic measurements has been developed. This system evolved from the system described in...
Briefs: Electronics & Computers
High-Performance Photodetector Circuit for Doppler Lidar
A photodetector circuit has been built for use in the receiver portion of a continuous-wave infrared Doppler lidar system for atmospheric research. As in nearly all Doppler lidar systems, the detection of the return signal in this system involves heterodyning, in a photodetector, with a...
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