Pseudolite

Pseudolite is a contraction of the term `pseudo-satellite,` used to refer to something that is not a satellite which performs a function commonly in the domain of satellites. Pseudolites are most often small transceivers that are used to create a local, ground-based GPS alternative. The range of each transceiver`s signal is dependent on the pow......
Found on http://en.wikipedia.org/wiki/Pseudolite

Pseudolite

A ground-based differential GPS receiver which transmits a signal like that of an actual GPS satellite, and can be used for ranging. Originally intended as an augmentation for Local Area Augmentation Systems to aid aircraft landings. However, pseudolites may also be used where signal obstructions are such that insufficient GPS satellites can be tra...
Found on http://www.gmat.unsw.edu.au/snap/gps/glossary_i-q.htm
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