Communications

Briefs : Communications
Sound Inaudible to Humans Can Be Recorded by Microphones

Microphones, from those in smartphones to hearing aids, are built specifically to hear the human voice — humans can’t hear at levels higher than 20 kHz, and microphones max out at...

Briefs : Communications
Handheld Tracking and Communications Device

Leaders of teams such as first responders must maintain situational awareness to effectively react, coordinate, and respond to circumstances that can often become hazardous. Effective communications and positional information of assets, including personnel, are critical to decision-makers in...

Briefs : Communications
Cup Cylindrical Waveguide Antenna

NASA Glenn’s cup cylindrical waveguide antenna (CCWA) is a short backfire microwave antenna capable of simultaneously supporting the transmission or reception of two distinct signals having opposite...

Briefs : Communications
Secure Optical Quantum Communications

NASA’s Glenn Research Center has developed a method of using entangled-photon pairs to produce highly secure mobile communications that require mere milliwatts of power. Conventional gas Argon-ion laser sources are too large, expensive, and power-intensive to use in portable applications. By contrast,...

Briefs : Test & Measurement
Chemical Identification by Magneto-Elastic Sensing (ChIMES)

A low-cost sensor technology, called Chemical Identification by Magneto-Elastic Sensing (ChIMES), uses target response materials (TRMs) as actuators in magneto-elastic (M-E) sensors...

Briefs : Automotive
MorphoHawk Mathematic Morphology Software for Image and Data Analysis

Computers and automated systems have accelerated productivity and improved quality and reliability for nearly everything, and are destined to take on increasing roles as time moves on. One major limiting factor for automated systems is their inability to categorize and...

Briefs : Communications
Zero-Power Radio Receiver

There are several different types of wireless radio frequency identification (RFID) tags that are truly zero-power radios. Currently, most unpowered wireless RFID tags only have a range of a few meters. There are longrange, low-powered tags that draw energy either from a battery or some other form of localized power. A...

Briefs : Communications
System Integrates High-Speed Data and Wireless Power Transfer

Sources of wireless power — such as wireless cellphone charging pads — require near-physical contact with the pad, limiting the usefulness of a truly wireless power source. Recent work has extended wireless power to mid-range, which can supply power at inches to feet of...

Briefs : Communications
Tunable, High-Isolation RF/Microwave Circulator

A new high-isolation RF circulator provides enhanced detection ranges (radar) and improved reception (communications) by reducing signal leakage and undesirable internal reflections between...

Briefs : Communications
Autonomous Positioning and Navigation Network

Engineers at NASA’s Marshall Space Flight Center have developed a machine-to-machine (M2M) network navigation protocol to enable spacecraft to perform autonomous navigation and positioning,...

Briefs : Communications
Paper-Thin Device Acts as a Loudspeaker and Microphone

A paper-thin, flexible device was created that can generate energy from human motion, and can act as a loudspeaker and microphone. The transducer is ultrathin, flexible, scalable, and...

Briefs : Communications
Personal Annunciation Device (PAD)

Many industrial and commercial plants, government and private research facilities, and industrial facilities perform potentially dangerous processes. Automated warning and alarm systems alert personnel to...

Briefs : Communications
Mobile Underwater Acoustic Communications

Reliable, long-range acoustic communications (LRAC) is an enabling technology for numerous applications of manned and unmanned underwater systems. For example, with the capability of communicating at...

Briefs : Communications
A Smooth-Walled Feedhorn with Sub-30-dB Cross-Polarization Over a 30-Percent Bandwidth

The focus of this research was the design, optimization, and measurement of a monotonically profiled, smooth-walled scalar feedhorn with a diffraction-limited ~14° FWHM (full width at half maximum). It is an easier-to-manufacture, smooth-walled feed that...

Briefs : Communications
Wireless Virtual Reality Headset

One of the limits of today's virtual reality (VR) headsets is that they must be tethered to computers in order to process data well enough to deliver high-resolution visuals. Wearing an HDMI cable reduces...

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