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Principle. When a traditional RACON receives a radar pulse, it responds with a signal which on a radar screen takes the form of a short line of dashes and dots forming a Morse character radiating away from the location of the beacon. Typically, the Morse character starts with a dash – a long, continuous signal.
The High-frequency Active Auroral Research Program ( HAARP) is a University of Alaska Fairbanks program which researches the ionosphere – the highest, ionized part of Earth's atmosphere . The most prominent instrument at HAARP is the Ionospheric Research Instrument (IRI), a high-power radio frequency transmitter facility operating in the high ...
Lidar ( / ˈlaɪdɑːr /, also LIDAR, LiDAR or LADAR, an acronym of "light detection and ranging" [1] or "laser imaging, detection, and ranging" [2]) is a method for determining ranges by targeting an object or a surface with a laser and measuring the time for the reflected light to return to the receiver.
Felix Mallard, executive producer/author John Green and Isabela Merced attend the Los Angeles Advanced Screening of Max’s ‘Turtles All The Way Down.’ Eric Charbonneau/Getty Images for Max ...
Katy Perry left "American Idol" as a judge following the Season 22 finale on ABC on May 19. Here are some musicians who've been suggested to replace her.
School board members in Virginia’s Shenandoah County voted early Friday to restore the names of two schools that previously honored Confederate leaders – four years after those names had been ...
Provides the warfighter with more secure, actionable and predictive information to enhance situational awareness. Enables new modernized signals (L1C, L2C, and L5) and has M-code capability, which the legacy system is unable to do.
The F-35's mission systems are among the most complex aspects of the aircraft. The avionics and sensor fusion are designed to improve the pilot's situational awareness and command-and-control capabilities and facilitate network-centric warfare.
A photon (from Ancient Greek φῶς, φωτός (phôs, phōtós) 'light') is an elementary particle that is a quantum of the electromagnetic field, including electromagnetic radiation such as light and radio waves, and the force carrier for the electromagnetic force.
Enrico Fermi (1901–1954) The Fermi paradox is a conflict between the argument that scale and probability seem to favor intelligent life being common in the universe, and the total lack of evidence of intelligent life having ever arisen anywhere other than on Earth. The first aspect of the Fermi paradox is a function of the scale or the large ...