Communications

Coming Soon - Technical Webinar Series from the Editors of SAE: Connected Vehicles & Jobsites

In Conjunction with SAEFleet owners have been deploying telematic solutions for some time, but connectivity is still just beginning to move from early adopters to mass market. Connectivity is providing more owners and operators a broad range of benefits, prompting a surge of developments by OEMs and suppliers. Chief among those benefits are safer, more efficient, and productive vehicles and worksites, both on- and off-highway. Yet technical challenges remain with development and testing of V2X communication, cybersecurity, and how to best utilize Big Data.

Posted in: Upcoming Webinars, Communications, Wireless

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Polarization-Dependent Whispering Gallery Modes (WGMs) in Microspheres

WGMs can benefit sensors used in aerospace vehicle control, health and performance monitoring, optical communications, and biological applications.Dielectric microspheres are optical structures that exhibit resonant properties, meaning they can be used to select very narrow wavelengths of an incoming light beam's spectrum for further manipulation and processing. The optical resonances of a microsphere are frequently called morphology dependent resonances (MDRs) or whispering gallery modes (WGMs). Innovators at NASA's Glenn Research Center have developed a method of separating low-level modes propagating in an optical fiber through the use of WGMs in spherical resonators. The unusually high quality factors (Q-factors) that can be achieved by side coupling of light into the dielectric spheres allow for measurement sensitivities that may far exceed those of more conventional sensors. Whispering gallery modes’ high sensitivity to environmental conditions and their small size make them good candidates for a wide range of sensors.

Posted in: Briefs, Communications

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Cellular Reflectarray Antenna and Method of Making Same

A simple-to-install design for satellite and communications applications solves the problems associated with traditional parabolic reflectors.NASA's Glenn Research Center invites companies to license a new concept design for terrestrial satellite dishes and communications systems. The Cellular Reflectarray Antenna (CRA) has been developed and tested for use with next-generation Ka-band satellites, although it can be used with all bands of satellite communication. The design's flat, planar configuration all but eliminates the wind-loading problems associated with larger parabolic reflectors for dish systems. The technology also offers unique features that provide ease of installation and improved signal reception, while deterring piracy and theft of subscription satellite services.

Posted in: Briefs, Communications

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9-Meter Slaving System

The objective of the 9-Meter Slaving System is to transmit Launch Trajectory Acquisition System (LTAS) data from one of multiple incoming data streams to the 9-Meter antenna control unit using a synchronous serial modem. The data stream is determined by a 9-Meter telemetry operator's selection via a graphical user interface (GUI).

Posted in: Briefs, Communications

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Ad Hoc Selection of Voice Over Internet Streams

This flexible system is applicable to a wide variety of systems, including office communications and telemedicine.NASA seeks interested parties to license the Ad Hoc Selection for Voice Over Internet (VoIP) Streams technology developed by engineers at Johnson Space Center. This technology features the ability to select specific audio streams from one or more sources and then convert them into a multicast to the user's audio player. This selection ability benefits the user by allowing a wide range of information and/or data to be monitored from a remote location using existing network technologies in near real time. For example, a user with a personal computer equipped with special-purpose audio player software first needs to launch the program and provide an identification and a password. Once both access control checks are completed, the audio software graphic is displayed, including audio stream and volume control buttons. The user can now select up to 21 streams to monitor simultaneously.

Posted in: Briefs, Communications

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Deep-Space Positioning System

NASA's Jet Propulsion Laboratory (JPL) has developed a compact, low-power, self-contained instrument that provides the equivalent of GPS throughout the solar system without the aid of an artificially provided infrastructure. The state-of-the-art X-ray navigation instrument is also able to determine the position of a spacecraft anywhere in the solar system, but it cannot provide this information relative to the Earth, the Sun, or any other remote target body (the equivalent of GPS providing a user's position relative to a vehicle, a second user, or any other moving target). JPL's uniquely capable deep-space positioning system determines the position and the target-relative position of a spacecraft anywhere in the solar system using optical navigation, which makes it ideally suited for any spacecraft requiring deep-space navigation services.

Posted in: Briefs, Communications

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GPS Satellite Geometry Analysis Tool (GPSGEM)

The purpose of the GPS Satellite Geometry Analysis Tool (GPSGEM) is to evaluate GPS satellite geometry for a given Earth-fixed location or for a provided trajectory. The tool will generate a listing of all satellites in view, the best satellite combination defined by the most optimum Geometric Dilution of Precision (GDOP), the GDOP profile expected if all satellites are available, and the worst-case GDOP profile when one or two satellites are removed from the available constellation. The tool will provide the navigation controller with insight into the expected performance of the GPS constellation, and allow an assessment of the implications to onboard navigation performance for the ascent, orbit, abort, and entry phases of flight.

Posted in: Briefs, Communications

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The Path to V2X Using Digital Short Range Communication (DSRC)

In Conjunction with SAEIn December 2016 NHTSA published a notice of proposed rule-making requiring automakers to equip their vehicle fleets with Digital Short Range Communication (DSRC) technology starting in 2019. This Tech Talk discusses key use cases for implementing the DSRC, as well as relevant information on standards, technology, and testing. It also provides the opportunity for the audience to ask questions.

Posted in: Tech Talks, Communications

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Q&A: Photonics Breakthrough 'Tunes' Wireless Communications

A chip-scale optical device, developed by a team from the University of Sydney’s Australian Institute for Nanoscale Science and Technology, achieves radio frequency signal control at sub-nanosecond time scales. The photonics breakthrough has the potential to provide broader bandwidth instantaneously to more users.

Posted in: News, Communications, Optical Components, Optics, Photonics

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Darmindra Arumugam, Senior Research Technologist, Jet Propulsion Laboratory, Pasadena, CA

In outdoor locations, firefighters and emergency responders can use GPS technology to track one another. Indoor environments like high-rises and steel-reinforced structures, however, frequently block radio signals. With the development of POINTER (Precision Outdoor and Indoor Navigation and Tracking for Emergency Responders), Darmindra Arumugam has addressed the sensing challenge, and provided a potentially game-changing tool for search and rescue teams.

Posted in: Who's Who, Communications

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