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Magazine

 

Detecting Drones with Doppler-Based Radar

Tech Briefs: October 2018

Eddie Hughes
  • Magazine Article
  • 18AERP10_01
Published 2018-10-01 by SAE International in United States

As drones become more commonplace, the need to secure facilities from the high-definition cameras and potential dangerous payloads has caused a rapid growth of counter-drone technologies.

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Spatial Resolution and Contrast of a Focused Diffractive Plenoptic Camera

Tech Briefs: September 2018

Carlos D. Diaz
  • Magazine Article
  • 18AERP09_09
Published 2018-09-01 by SAE International in United States

New technology captures spectral and spatial information of a scene in one snapshot while raising pixel counts and improving image quality.

The concept of an imaging system that captures both spatial and spectral information has existed for a while. An example of one such imaging system that encodes both location and wavelength into an image is a Fourier Transform Spectrometer (FTS).

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Enhanced SATCOMs for Unmanned Aerial Systems

Tech Briefs: September 2018

Marlin McFate
  • Magazine Article
  • 18AERP09_01
Published 2018-09-01 by SAE International in United States

Satellites launched with the purpose of relaying communications have been enabling around-the-globe transmissions of information for half a century. And in this current era of hybrid warfare, that means this decades-old hardware needs to be able to manage the command and control of unmanned aircraft.

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Combating Infrared Threats on the Battlefield

Tech Briefs: September 2018

Shawn Cullens
  • Magazine Article
  • 18AERP09_03
Published 2018-09-01 by SAE International in United States

There have been several news headlines lately about offenders pointing commercial lasers at helicopters or police personnel, temporarily blinding and distracting them. An increasing number of “laser assault” incidents have led to tougher penalties with fines and jail time in various countries. The lasers typically used in these attacks operate in the visible light spectrum; therefore, these lasers can be blocked by special absorbing optical dyes contained in special laser defense eyewear.

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Ultracompact, High-Speed Field-Effect Optical Modulators

Tech Briefs: September 2018

Karl Hirschman
  • Magazine Article
  • 18AERP09_10
Published 2018-09-01 by SAE International in United States

Conductive oxides-based modulator devices could provide promising candidates for ultra-compact and ultra-fast optical interconnects in future integrated photonic circuits.

The major goals of this research project included two parts. First, an ultracompact plasmonic electrooptical (EO) modulator was to be developed and investigated for efficient intensity modulation. Second, an ultracompact and high-speed EO modulator based on a dielectric platform was to be developed for straightforward integration with existing CMOS technology. Both modulators were targeted to facilitate next-generation interconnects for integrated photonic circuits.

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Integrated Magneto-Optical Devices for On-Chip Photonic Systems

Tech Briefs: September 2018

Caroline Ross, Juejun Hu
  • Magazine Article
  • 18AERP09_07
Published 2018-09-01 by SAE International in United States

Development of magneto-optical (MO) materials could lead to a range of nonreciprocal optical devices for emerging standardized photonic integrated circuit (PIC) fabrication processes.

The magneto-optical (MO) oxide layer consists of (Bi,Y)3Fe5O12 or BiYIG, bismuth garnet. This material was selected because it has a better figure of merit than the CeYIG previously used, especially at lower wavelengths (1310 nm vs. 1550 nm). A top-down deposition process was developed in which BiYIG/YIG stacks are grown on the Si waveguide with YIG on top. The stack is annealed at 800°C/5 min to crystallize both layers, with the YIG templating the BiYIG leading to garnet phases rather than other oxides, and the BiYIG is directly on the Si waveguide. Initial attempts led to a film with Bi oxide phases, because the Bi was in excess and could not escape during the anneal as occurs in Si/YIG/BiYIG stacks. Hence the composition was adjusted to include slightly more Fe, which yielded films with only garnet peaks.

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The Bus TOO TOUGH to Die

Tech Briefs: September 2018

Mark Hearn
  • Magazine Article
  • 18AERP09_02
Published 2018-09-01 by SAE International in United States

The venerable MIL-STD-1553B bus has survived remarkably well even as other more advanced solutions gained wide acceptance in the last few years. However, the fact remains that its maximum data rate of 1 Mb/s is orders of magnitude too slow for today's data-intensive systems, so logic dictates that it will soon fade away. That may be a logical assumption, but it's likely to prove wrong, for several reasons.

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High-Performance Computing for the Next-Generation Combat Vehicle

Tech Briefs: September 2018

Brian J. Henz, Dale Shires
  • Magazine Article
  • 18AERP09_05
Published 2018-09-01 by SAE International in United States

The development of the Next-Generation Combat Vehicle (NGCV) will require technological advancements in many areas, including lethality, protection, autonomy, human-agent teaming, and electromagnetic capabilities. What ties all of these future capabilities together is the need for vast computational resources to support the artificial intelligence (AI) implicit in bringing these advancements to the battlefield. The operating environment of the NGCV will be such that communications will be severely limited, if available at all; systems will be under constant cyber-attack; and adversarial AI may be actively attempting to deceive all sensors - all occurring under severe size, weight, power, and time-available constraints. These factors, and more, are the motivation for developing a strategy of mobile High-Performance Computing (HPC) for the NGCV.

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Merging Antenna and Electronics Boosts Energy and Spectrum Efficiency

Tech Briefs: September 2018

John Toon
  • Magazine Article
  • 18AERP09_06
Published 2018-09-01 by SAE International in United States

By integrating the design of antennas and electronics, researchers from the Georgia Institute of Technology have boosted the energy and spectrum efficiency for a new class of millimeter-wave transmitters, allowing improved modulation and reduced generation of waste heat.

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Low Power Optical Phase Array Using Graphene on Silicon Photonics

Tech Briefs: September 2018

Ipshita Datta, Brian Lee, Michael Lipson
  • Magazine Article
  • 18AERP09_08
Published 2018-09-01 by SAE International in United States

Electrostatic doping of 2D materials embedded in waveguides could enable ultrafast devices with unprecedented power.

Despite enormous advances in integrated photonics over the last decade, an efficient integrated phase delay remains to be demonstrated. This problem is fundamental - most monolithic thin film deposition relies on centro symmetric materials (such as silicon, silicon dioxide, silicon nitride), which by definition do not have an electro-optic effect. Such materials have been shown to be excellent transparent materials, however they are either optically passive, or rely on very small plasma dispersion effect or power-hungry thermo-optic effect for tunability. These phase change materials have losses associated due to heating or carrier injection in the waveguides. This research shows that graphene can be used to provide electro-optic properties to traditionally passive optical materials.

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