Base station
In surveying, it is a GPS receiver at a known position, while in wireless communications it is a transceiver connecting a number of other devices to one another and/or to a wider area.
This correction data allows propagation and other effects to be corrected out of the position data obtained by the mobile stations, which gives greatly increased location precision and accuracy over the results obtained by uncorrected GPS receivers.
[6] Examples of base station uses in two-way radio include the dispatch of tow trucks and taxicabs.
Each base station appears as a single channel on the dispatch center control console.
For example, a taxi company dispatch center may have one base station on a high-rise building in Boston and another on a different channel in Providence.
Dispatching personnel can tell which channel a message is being received on by a combination of local protocol, unit identifiers, volume settings, and busy indicator lights.
Remote control base stations can be operated over tone- or DC-remote circuits.
Some system configurations require duplex, or four wire, audio paths from the base station to the console.
An Australian UHF CB base station is another example of part of a system used for hobby or family communications.
While low levels of radio-frequency power are usually considered to have negligible effects on health, national and local regulations restrict the design of base stations to limit exposure to electromagnetic fields.
Technical measures to limit exposure include restricting the radio frequency power emitted by the station, elevating the antenna above ground level, changes to the antenna pattern, and barriers to foot or road traffic.
