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Japanese Quasi-Zenith Satellite-1 (QZS1) named MICHIBIKI was launched in September, 2010. This paper shows a preliminary\udestimation of positioning accuracy of the QZS1. The mission of QZS1 is to raise the positioning accuracy of GPS. The QZS1 has 3\udpositioning signals named LEX, L1-SAIF and L1-CA. LEX and L1-SAIF are auxiliary signals based RTK and differential\udmeasurement using revised information derived from the electronic reference points managed by the Geographic Survey Institute of\udJapan respectively. QZS1 L1-SAIF signal is expected the accuracy less than 1 m. In order to estimate the positioning accuracy of\udQZS1 L1-SAIF, the positioning accuracy of QZS1 were compared with the accuracy of GPS single measurement. As the results, for\udan example, GPS accuracy is 3.17 m in latitude and 3.90 m in longitude, and L1-SAIF accuracy is 1.68 m and 1.80 m respectively.\udThis result indicates L1-SAIF provides high accuracy than GPS. But others result showed, GPS accuracy is 1.57 m in latitude and\ud1.26 m in longitude and L1-SAIF accuracy is 4.03 m and 0.92 m respectively. Conclusions are; (1) L1-SAIF signal were obtain submeter\udaccuracy. (2) Almost L1-SAIF signal were obtained high accuracy better than GPS. (3) In worst case, L1-SAIF signal were\udobtained worse accuracy than GPS. The reason is assumed the influence of the East Japan tremendous earthquake. As the electronic\udreference points were moved by the earthquake, the reinforcement value derived from the electronic reference points might be\udincorrect

the international archives of the photogrammetry, remote sensing and spatial information sciences/international archives of the photogrammetry, remote sensing and spatial information sciences

PRELIMINARY ESTIMATION ON POINTING ACCURACY OF JAPANESE QUASI-ZENITH SATELLITE-1 (MICHIBIKI) L1-SAIF