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  2. Radar beacon - Wikipedia

    en.wikipedia.org/wiki/Radar_beacon

    Radar beacon. Racon signal as seen on a radar screen. This beacon receives using sidelobe suppression and transmits the letter "Q" in Morse code near Boston Harbor (Nahant) 17 January 1985. Radar beacon (short: racon) is – according to article 1.103 of the International Telecommunication Union's (ITU) ITU Radio Regulations (RR) [1 ...

  3. Ronald Reagan Ballistic Missile Defense Test Site - Wikipedia

    en.wikipedia.org/wiki/Ronald_Reagan_Ballistic...

    An exoatmospheric kill vehicle ( kinetic penetrator, mid-phase) is launched from Meck Island on 3 December 2001. The Ronald Reagan Ballistic Missile Defense Test Site, commonly referred to as the Reagan Test Site (formerly Kwajalein Missile Range ), is a missile test range in Marshall Islands ( Pacific Ocean ).

  4. Radioactive tracer - Wikipedia

    en.wikipedia.org/wiki/Radioactive_tracer

    A radioactive tracer can also be used to track the distribution of a substance within a natural system such as a cell or tissue, [1] or as a flow tracer to track fluid flow. Radioactive tracers are also used to determine the location of fractures created by hydraulic fracturing in natural gas production. [2] Radioactive tracers form the basis ...

  5. Startups look beyond lidar for autonomous vehicle perception

    techcrunch.com/2021/01/16/startups-look-beyond...

    autonomous vehicles, Lidar. Last CES was a time of reckoning for lidar companies, many of which were cratering due to a lack of demand from a (still) nonexistent autonomous vehicle.

  6. Look-down/shoot-down - Wikipedia

    en.wikipedia.org/wiki/Look-down/shoot-down

    Look-down/shoot-down. A radar system has look-down/shoot-down capability if it can detect, track and guide a weapon to an air target that (as seen by the radar) is silhouetted against the ground.

  7. Admiralty code - Wikipedia

    en.wikipedia.org/wiki/Admiralty_code

    The Admiralty System or NATO System is a method for evaluating collected items of intelligence. The system comprises a two-character notation assessing the reliability of the source and the assessed level of confidence on the information.

  8. Cone tracing - Wikipedia

    en.wikipedia.org/wiki/Cone_tracing

    The second treats an accurate pyramidal beam through the pixel and along a complex path, but it only works for polyhedrical shapes. Cone tracing solves certain problems related to sampling and aliasing, which can plague conventional ray tracing. However, cone tracing creates a host of problems of its own. For example, just intersecting a cone ...

  9. R-S-T system - Wikipedia

    en.wikipedia.org/wiki/R-S-T_system

    The R-S-T system is used by amateur radio operators, shortwave listeners, and other radio hobbyists to exchange information about the quality of a radio signal being received. The code is a three digit number, with one digit each for conveying an assessment of the signal's readability, strength, and tone.

  10. Universal Product Code - Wikipedia

    en.wikipedia.org/wiki/Universal_Product_Code

    The Universal Product Code (UPC or UPC code) is a barcode symbology that is used worldwide for tracking trade items in stores.

  11. Ray tracing (physics) - Wikipedia

    en.wikipedia.org/wiki/Ray_tracing_(physics)

    Ray tracing (physics) In physics, ray tracing is a method for calculating the path of waves or particles through a system with regions of varying propagation velocity, absorption characteristics, and reflecting surfaces. Under these circumstances, wavefronts may bend, change direction, or reflect off surfaces, complicating analysis.