Pseudorange

Pseudorange refers to the first approximation of the distance between a transmitter and a receiver in the period of the radio signal. Pseudo (false, spurious ), because due to the large factor the speed of light already run (300 meters per microsecond) small clock error means that the pseudo-paths become unusable as a direct measure of the distance.

When pseudoranges are two transmitters, such as navigation satellites measured and the clock errors can be assigned to the receiver, because the stations have accurate clocks and synchronize with each other, then one measures effectively a distance difference at known positions of the transmitter, the position of the receiver determines a hyperbola, see hyperbolic.

The possibility to eliminate the clock error, see e.g. the article GPS technology. The manufacturer-independent exchange format for GPS pseudoranges called RINEX.