2009 Volume 55 Issue 1 Pages 65-85
The precision of three kinematic GPS softwares, GIPSY/OASIS II, IT, and GrafNav, was evaluated for seafloor geodetic observation. Positions of a rover station moving on a precise slider were determined from several reference stations located at different baseline lengths of 10 m, 30 km, 60 km, 90 km, 110 km, and 150 km. Reference solution was obtained from the shortest baseline (10 m) using each software, and then other solutions from longer baselines were compared with the reference one. The result showed that the precision (root-mean-square) of the positioning by the three softwares was ∼2 cm horizontally and ∼5 cm vertically. Moreover, even with the larger baseline lengths, there was no apparent decrease in positioning precision. However, it was observed that the precision was affected more by the spatio-temporal variation of atmospheric environment rather than by the variation of baseline length.
