Akademik Veri Yönetim Sistemi
INTERNATIONAL JOURNAL OF SATELLITE COMMUNICATIONS AND NETWORKING, cilt.39, sa.3, ss.280-293, 2021 (SCI-Expanded)
We studied five multiconstellation systems (GPS, GLONASS, Galileo, BeiDou, and QZSS) signals by selecting 10 MGEX network stations over the Asia-Pacific region. A comparative analysis with the number of satellite visibilities (NSVs), signal-to-noise ratio (SNR), multipath combination (MPC), and precise point positioning (PPP) including the phase and code residuals (PCRs) of different constellations is carefully investigated to measure the individual performances. The SNR data were extracted on a map representing the elevation angle via wavelet analysis. The analysis indicated that the correlation coefficient of elevation angle with the SNR varies for different satellite orbits, although the number of wavelets corresponded to the visible frequency of satellites. We examined the MPC by using the power spectrum and verified the frequency component of the multipath signature. The results show that the BeiDou and QZSS constellations signals were significantly more affected compared with the GPS and GLONASS signals and less affected compared to the Galileo signal. We plotted PCR from different satellites systems relative to time and elevation angles. It was observed that the QZSS residuals exhibited the largest values, and the Galileo and BeiDou residual values were slightly smaller values compared with the GPS and GLONASS residuals.