Influence Analysis of Differential Corrections Transmitting Cycle on Positioning Precision

The positioning error elements of GPS are described and the differential means are proposed in detail. The mathematics models of pseudo-range position and pseudo-range differential position are also introduced. The relationship between the corrected user pseudo-range residue and SA signal is analyzed. Based on the temporal correlation of SA signal, a suitable transmitting cycle of correction is then acquired in the local differential method. The correction contains pseudo-range correction and pseudo-range rate correction, which are included in the RTCM SC-104 telegraphese 1. In final, the practical conclusion is provided via many pseudo-range differential position experiments in a fixed point and many different correction-transmitting cycles.