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  2. Choke ring antenna - Wikipedia

    en.wikipedia.org/wiki/Choke_ring_antenna

    A choke ring antenna is a directional antenna designed for reception of GNSS signals from satellites. It consists of a number of concentric conductive cylinders around a central antenna. The first choke ring antennas were invented at JPL; [2] since 1989 they have been improved and extended by many companies. [citation needed]

  3. Global Positioning System - Wikipedia

    en.wikipedia.org/wiki/Global_Positioning_System

    This antenna is mounted on the roof of a hut containing a scientific experiment needing precise timing. Many civilian applications use one or more of GPS's three basic components: absolute location, relative movement, and time transfer.

  4. Antenna types - Wikipedia

    en.wikipedia.org/wiki/Antenna_types

    the upper half of a vertical full-wavelength loop antenna mounted on the ground (not to be confused with the visually similar but electrically different half-square antenna described below, under array antennas, [r] nor to be confused with the halo antenna, described next). The full loop is cut at two opposite points along its perimeter, and ...

  5. Transient Array Radio Telescope - Wikipedia

    en.wikipedia.org/wiki/Transient_Array_Radio...

    The antenna array consists of 24 antennas arranged on four identical 'tiles' with 6 antennas each. Each tile is a 1x1 meter square. The antennas used are low-cost, widely available commercial GPS active antennas. More recent installations use multi-arm antenna arrays in either a three-arm 'Y' configuration, or a five-arm star configuration.

  6. GPS in the earthmoving industry - Wikipedia

    en.wikipedia.org/wiki/GPS_in_the_Earthmoving...

    GPS satellite signals can only be received in a non obstructed view of the sky with the exception of clouds. If a contractor wanted to perform grade work in preparation for a concrete floor within a building, for example, the roof would block the view to the GPS satellites, preventing the system from working.

  7. Indoor positioning system - Wikipedia

    en.wikipedia.org/wiki/Indoor_positioning_system

    A large variety of techniques and devices are used to provide indoor positioning ranging from reconfigured devices already deployed such as smartphones, WiFi and Bluetooth antennas, digital cameras, and clocks; to purpose built installations with relays and beacons strategically placed throughout a defined space. Lights, radio waves, magnetic ...

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