Abstract
The Quasi-Zenith Satellite System (QZSS) is a system capable of regional time transmission and satellite-based enhancement for Global Positioning System (GPS) receivable in the Asia-Oceania regions, and the main service focus is within Japan. QZSS has 4 on-orbit service satellites, including three quasi-zenith orbits (QZO) satellites and one geostationary earth orbit (GEO) satellite. This paper is to study the multipath performance of QZSS L1, L2 and L5 signals. Multipath performance has always been one of the research hotspots to assess GNSS signals. For all visible QZSS satellites, the data of six International GNSS Service (IGS) stations located at unequal latitudes in the regions of Asia-Oceania over three days is analyzed. The code multipath was estimated by using pseudorange multipath (MP) method. A time-frequency representation was performed to strictly account for the existence of multipath based on the use of continuous wavelet transform (CWT). The experimental results showed that the correlation coefficient of code multipath of two consecutive days of low-latitude stations is higher than that of high-latitude stations, and the correlation coefficient is over 80%. As for the suppression of code multipath, the L2 signal is significantly superior to other QZSS signals, and the GEO (now only J07) satellite is superior to the QZO satellite.
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