Characteristics and applications of precise GPS clock solutions every 30 seconds

Using carrier phase and pseudorange data from a small network of globally distributed GPS receivers with precise time references, we are able to estimate GPS clock parameters every 30 s, with subdecimeter accuracy, in a computationally efficient manner. The accuracy obtained is a factor of 100 to 1000 times better than that of clocks in the broadcast navigation message, and allows postprocessing of high-rate single-receiver kinematic GPS data with few-centimeter-level precision when used in conjunction with precise GPS orbits. The amplitude of the daily clock variability is typically 24 m for satellites affected by selective availability. (Author)