The modernization of GPS will provide new signals: L5, L1C and L2C. These signals are expected to be effective forpositioning accuracy improvement. As for the positioning technique, the method called PPP (Precise Point Positioning) isrecently receiving attention. This paper first summarizes the result of the experiment in PPP utilizing orbit and clock dataof several accuracy grades, followed by some discussion on the effect of data accuracy to positioning accuracy. Thispaper also discusses the predicted advantage and possibility to the positioning accuracy improvement gained by themodernized GPS signals and LEX signal of QZSS (Quasi Zenith Satellite System).
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