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  2. Instrument landing system - Wikipedia

    en.wikipedia.org/wiki/Instrument_landing_system

    ILS planes. An instrument landing system operates as a ground-based instrument approach system that provides precision lateral and vertical guidance to an aircraft approaching and landing on a runway, using a combination of radio signals and, in many cases, high-intensity lighting arrays to enable a safe landing during instrument meteorological conditions (IMC), such as low ceilings or reduced ...

  3. Low-frequency radio range - Wikipedia

    en.wikipedia.org/wiki/Low-frequency_radio_range

    Low-frequency radio range audio signals: N stream, A stream and combined uniform tone (simulated sounds) The low-frequency radio range, also known as the four-course radio range, LF/MF four-course radio range, A-N radio range, Adcock radio range, or commonly "the range", was the main navigation system used by aircraft for instrument flying in the 1930s and 1940s, until the advent of the VHF ...

  4. Instrument landing system localizer - Wikipedia

    en.wikipedia.org/wiki/Instrument_landing_system...

    Localizer as component of an ILS (KMEZ runway 27, Mena, Arkansas) Emission patterns of the localizer and glide path signals. An instrument landing system localizer, or simply localizer (LOC, [1] or LLZ prior to 2007 [2]), is a system of horizontal guidance in the instrument landing system, which is used to guide aircraft along the axis of the runway.

  5. Glide path - Wikipedia

    en.wikipedia.org/wiki/Glide_path

    Emission patterns of the localizer and glide slope signals Glide slope station for runway 09R at Hannover Airport in Germany. In aviation, instrument landing system glide path, commonly referred to as a glide path (G/P) or glide slope (G/S), is "a system of vertical guidance embodied in the instrument landing system which indicates the vertical deviation of the aircraft from its optimum path ...

  6. Transponder landing system - Wikipedia

    en.wikipedia.org/wiki/Transponder_Landing_System

    For an aircraft conducting an instrument approach, the TLS will transmit horizontal and vertical guidance signals to the ILS receiver and cockpit avionics that are identical to those of an ILS. The signals will thus appear to emanate from fixed locations where ILS antennas are typically installed.

  7. Marker beacon - Wikipedia

    en.wikipedia.org/wiki/Marker_beacon

    An LOM is a navigation aid used as part of an instrument landing system (ILS) instrument approach for aircraft. Aircraft can navigate directly to the location using the NDB as well as be alerted when they fly over it by the beacon. The LOM is becoming less important now that GPS navigation is well established in the aviation community. [4]

  8. Difference in the depth of modulation - Wikipedia

    en.wikipedia.org/wiki/Difference_in_the_Depth_of...

    When an aircraft follows the course line, the difference in the depths of the modulation between the two frequencies is zero. This difference is conventionally displayed by the deflection of a moving coil indicator or needle on an instrument known as a horizontal situation indicator (HSI).

  9. Space modulation - Wikipedia

    en.wikipedia.org/wiki/Space_modulation

    Space modulation is a radio amplitude modulation technique used in instrument landing systems (ILS) that incorporates the use of multiple antennas fed with various radio frequency powers and phases to create different depths of modulation within various volumes of three-dimensional airspace. This modulation method differs from internal ...