抄録
The sub meter class positioning accuracy is required in marine observations around Toyama Bay, and GPS positioning observation has been carried out at a fixed point in Toyama National College of Technology in order to investigate the positioning accuracy. The DGPS positioning accuracy by QZSS L1-SAIF signal was investigated in comparison with the DGPS accuracy by the MSAS signal in this paper. As results, they became clear that there is about 0.4 meter difference between DGPS mean positions by QZSS L1-SAIF signal and MSAS signal in Toyama, RMS errors were same in DGPS positions determined by QZSS L1-SAIF signal and MSAS signal, but there was an inclination to increase position error occasionally in DGPS positioning by QZSS L1-SAIF signal. These results confirm that the DGPS positioning accuracy by QZSS L1-SAIF signal is unstable as compared with DGPS positioning accuracy by MSAS signal. The reason is that QZSS is in test operating mode.
