Repeatable The accuracy with which a user can return to a position whose coordinates have been measured at a previous time with the same navigation system. The accuracy with which a user can measure position relative to that of another user of the same navigation system at the same time. Pseudorange A distance measurement, based on the correlation of a satellite-transmitted code and the local receiver's reference code, that has not been corrected for errors in synchronization between the transmitter's clock and the receiver's clock. The rate of change between the satellite and receiver. The range to a satellite changes due to satellite and observer motions.
Range rate is determined by measuring the doppler shift of the satellite beacon carrier.
A set of standard definitions and formats that permits interchangeable use of GPS data from dissimilar GPS receiver models or post-processing software. The format includes definitions for time, phase and range. The radius of a sphere within which there is a 50 percent probability of locating a point or being located. A GPS receiver channel that multiplies the received signal by itself to obtain a second harmonic of the carriers that does not contain the code modulation. A measure of the dispersion of random error about the mean value.