Experimental differential GPS reference station evaluation

Differential GPS operation (DGPS) uses a reference station at a known location to calculate and broadcast pseudorange corrections to local users, resulting in improved user position accuracy. DGPS accuracy is limited by the ability of the reference station to remove the effects of receiver measurement noise and multipath errors from the broadcast corrections. The article presents two new algorithms for DGPS reference station design. The article also presents an experimental analysis of the accuracy of the algorithms. The single and two frequency reference station algorithms, respectively, achieve 6 dB and >20 dB improvement relative to the raw corrections.