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  2. Proportional navigation - Wikipedia

    en.wikipedia.org/wiki/Proportional_navigation

    It is based on the fact that two vehicles are on a collision course when their direct line-of-sight does not change direction as the range closes. PN dictates that the missile velocity vector should rotate at a rate proportional to the rotation rate of the line of sight (Line-Of-Sight rate or LOS-rate), and in the same direction.

  3. Line of sight - Wikipedia

    en.wikipedia.org/wiki/Line_of_sight

    The term "line" typically presumes that the light by which the observed object is seen travels as a straight ray, which is sometimes not the case as light can take a curved/angulated path when reflected from a mirror, [5] refracted by a lens or density changes in the traversed media, or deflected by a gravitational field. Fields of study ...

  4. Line-of-sight propagation - Wikipedia

    en.wikipedia.org/wiki/Line-of-sight_propagation

    Line of sight (LoS) propagation from an antenna. Line-of-sight propagation is a characteristic of electromagnetic radiation or acoustic wave propagation which means waves can only travel in a direct visual path from the source to the receiver without obstacles. [1] Electromagnetic transmission includes light emissions traveling in a straight line.

  5. AOL MyLifeProtected - Member Benefit FAQs - AOL Help

    help.aol.com/articles/mylifeprotected-member...

    AOL MyLifeProtected makes it easier for you to navigate the insurance buying process and understand the market-leading insurance plans that best meet your insurance needs. Go to the AOL MyLifeProtected webpage to get started. After answering a few questions about yourself and the type(s) of insurance you’re interested in, AOL MyLifeProtected ...

  6. Over-the-horizon radar - Wikipedia

    en.wikipedia.org/wiki/Over-the-horizon_radar

    The frequency of radio waves used by most radars, in the form of microwaves, propagate in straight lines.This generally limits the detection range of radar systems to objects on their horizon (generally referred to as "line of sight" since the aircraft must be at least theoretically visible to a person at the location and elevation of the radar transmitter) due to the curvature of the Earth.

  7. Non-line-of-sight propagation - Wikipedia

    en.wikipedia.org/wiki/Non-line-of-sight_propagation

    Non-line-of-sight (NLOS) radio propagation occurs outside of the typical line-of-sight (LOS) between the transmitter and receiver, such as in ground reflections. Near-line-of-sight (also NLOS ) conditions refer to partial obstruction by a physical object present in the innermost Fresnel zone .

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  9. Beam riding - Wikipedia

    en.wikipedia.org/wiki/Beam_riding

    Beam riding is one of the simplest methods of missile guidance using a radar. It was widely used for surface-to-air missiles in the post-World War II era for this reason. An early example was the British Brakemine, first tested in 1944, as was the first commercially available SAM, the Oerlikon Contraves RSA.