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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]
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.
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.
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.
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 ...
Cellular lattice tower A cell tower in Peristeri, Greece. A cell site, cell phone tower, cell base tower, or cellular base station is a cellular-enabled mobile device site where antennas and electronic communications equipment are placed (typically on a radio mast, tower, or other raised structure) to create a cell, or adjacent cells, in a cellular network.
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The GPS puck is commonly used in the boating electronic industry. The reason the boating industry uses the GPS puck is because they give a true signal of direction so you can tell where you're at and where you're going on the water or land. Alternatively, a GPS puck is a full puck-sized GPS system (receiver and antenna).
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