pseudo-satellite, a ground-based transmitter that mimics a GPS satellite. Intended to improve geometric solutions in a local area. The data portion of the signal may also contain differential corrections that can be used by receivers to correct for GPS errors.

A ground-based differential GPS receiver which transmits a signal like that of an actual GPS satellite, and can be used for ranging.

A ground-based differential GPS receiver that simulates the signal of a GPS satellite and can be used for ranging. The data portion of the signal may also contain differential corrections that can be used by receivers to correct for GPS errors.

An Extra Satellites like device, installed on the ground in the local area. It is used to supply "illumination" and correction signals for DGPS systems.

Pseudo-satellite. Ground station emitting satellite-like signals.

Pseudolite is a contraction of the term "pseudo-satellite," used to refer to something that is not a satellite, 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. This is also known as a Local Area Augmentation System (LAAS).