基線長別移動体測位実験によるキネマティックGPSソフトウエアの評価

摘要

The precision of three kinematic GPS softwares, GIPSY/OASIS II, IT, and GrafNav, wasevaluated for seafloor geodetic observation. Positions of a rover station moving on a precise sliderwere determined from several reference stations located at different baseline lengths of 10 m, 30km, 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 withthe reference one. The result showed that the precision (root-mean-square) of the positioning bythe three softwares was –2 cm horizontally and –5 cm vertically. Moreover, even with the largerbaseline lengths, there was no apparent decrease in positioning precision. However, it was observedthat the precision was affected more by the spatio-temporal variation of atmospheric environmentrather than by the variation of baseline length.