Design Document for Differential GPS (Global Positioning System) Ground Reference Station Pseudorange Correction Generation Algorithm

摘要

The pseudorange correction generation algorithm takes the satellite measurements and processes them through a filter to remove the receiver-unique error sources, which tend to be higher frequency than locally common error sources. An estimate of clock error is computed and then removed equally from all filter outputs. The clock-corrected filter outputs are coefficients of a quadratic function in time estimating pseudorange error. A best-fit linear approximation to this function over the applicable interval is generated; the coefficients of this linear time function are the elements to be broadcast as a pseudorange correction.