Keyword: Telecommunications

Briefs: Electronics & Computers

A data-communication and -processing network of compact, laptop-computer-based portable stations communicating via the World Wide Web (WWW) has been proposed as a relatively...

Briefs: Software
Application Specific Integrated Circuit Physical Layout for the RSDL ASIC

An integrated circuit physical layout has been developed for the RSDL ASIC™ — an integrated circuit that encodes telemetry data and transfers the data (which are grouped together in transfer frames) to a radio transmitter. The RSDL ASIC is described in "ASIC for...

Briefs: Photonics/Optics

As currently practiced, packaging of individual optoelectronic components accounts for 40-50 percent of product cost. The development of higher-volume, lower-cost optoelectronic...

Briefs: Electronics & Computers

Due to their low density and exceptionally high strength and modulus, graphite fiber composites are being used increasingly for the fabrication of aircraft and spacecraft. Because of their...

Briefs: Photonics/Optics

External-cavity diode lasers (ECDLs) have been commercially available for several years. Since their introduction, they have found applications ranging from telecommunications to...

Briefs: Electronics & Computers

The Reed-Solomon downlink application-specific integrated circuit (RSDL ASIC) performs Reed-Solomon encoding of telemetry data, internally generates all timing and control signals necessary...

Briefs: Electronics & Computers
Control System for Steerable, Rooftop-Mounted Antenna

An excerpt from JPL Document D-12104 presents additional information on the control system of a steerable microwave antenna that is mounted on the roof of a land vehicle and used to communicate with a geostationary satellite. The antenna and control system were described previously in...

Briefs: Electronics & Computers

Stimulated Brillouin Scattering (SBS) in optical fibers can be exploited to obtain frequency conversion with amplification and frequency-selective amplification in photonic...

Briefs: Electronics & Computers

An oscillator circuit that contains superconductive and ferroelectric resonator elements is undergoing development. This circuit is designed to serve as a frequency-locked...

Briefs: Electronics & Computers

During the development and testing of signal processing systems, it is useful to generate test signals in the laboratory in order to quantify system parameters such as dynamic range,...

Briefs: Information Technology

An improved method of analysis and design offers the potential to enhance the performances of adaptive feedforward tracking systems. The method can, in principle, make it possible to...

Briefs: Photonics/Optics

A great increase in the effectiveness of fiber optic systems is possible with a device that allows for simultaneous two-way signalling of multiple data streams on a single optical...

Briefs: Motion Control

The tunable external cavity diode laser is an important new tool used to evaluate and test the latest fiber-optic components and building blocks of modern telecommunications systems. A key factor...

Briefs: Electronics & Computers
Signaling-and-Detection Scheme for Beacon Monitoring

A signaling-and-detection scheme has been proposed for use in conjunction with the remote-monitoring concept described in "Beacon Monitoring Would Reduce Interactions With Remote Systems" (NPO-19706), NASA Tech Briefs, Vol. 21, No. 5 (May 1997), page 54. To recapitulate: A remote system (a...

Briefs: Photonics/Optics

Pulse shepherding is a nonlinear signal-propagation phenomenon that can occur when several pulses of light at different wavelengths are launched simultaneously or nearly simultaneously along the...

Briefs: Electronics & Computers

An algorithm estimates the Doppler frequency shift in a received radio signal with square-wave-pulse binary differential-phase-shift-keyed (DPSK) modulation. [With little...

Briefs: Software
Web-Based Software for Coordinating Work

WWWorkflow is a language-driven, data-base-mediated, web-based process mediation system. WWWorkflow leverages on intranet applications and existing information infrastructure services, making it possible to add workflow management features to preexisting information management systems, without the need...

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