VRS technology based on multi-base station network and its error analysis

The existing problems of conventional RTK in actual applications specifically indicate that the difference technology can only eliminate the public error between base station and subscriber station under certain conditions. With the increases of baseline length (more than 20 km), the correlation of errors between tropospheric and ionospheric weakens or even disappears such that, the differential GPS technology loses its theoretical foundation. The experimental analysis shows that in network RTK, the Virtual Reference Station RTK technology enables VRS technology to extend the effective distance from 15 km to 50 km or more, and thus, to greatly enhance the relative positioning accuracy in medium-baseline and long-baseline (20∼50km).