Abstract
The Quasi-Zenith Satellite System (QZSS) service area covers the Asia-Pacific region and there are four quasi-zenith satellites (QZS) in orbit with three QZS in operation until March 2018. The QZSS is not required to work in a stand-alone mode, but the system can be used to enhance the Global Positioning System (GPS) or Beidou Satellite Navigation System (BDS). The availability, position dilution of precision (PDOP), ambiguity dilution of precision (ADOP), and success rate of GPS/QZSS and BDS/QZSS under different cut-off elevation angles were compared based on a simulation. Two sets of actual QZSS data were processed and analyzed for single-frequency single-epoch (SFSE) positioning together with GPS/BDS data in this paper. Different combination forms were executed to evaluate the positioning performance of GPS/QZSS and BDS/QZSS for two baseline cases. The results indicate that QZSS is able to increase the SFSE PDOP, ADOP, and success rate of the baseline resolution and decrease the position error for GPS or BDS, especially for longer GPS baseline data. The more QZS are used, the better the enhancement effect.
Highlights
The four global satellite navigation systems, Global Positioning System (GPS), Global Navigation Satellite System (GLONASS), Galileo Satellite Navigation System (Galileo), and Beidou Satellite Navigation System (BDS) have enabled a wide range of applications for positioning, navigation and timing [1]
In [13], the positioning performance of GPS aided by Quasi-Zenith Satellite System (QZSS) was improved by more than 30% for high elevation mask angles and positioning availability, which is more stable than the single GPS
A week of simulation on availability, position dilution of precision (PDOP), ambiguity dilution of precision (ADOP), and the bootstrapped success rate (Bsrt) simulation was carried out for GPS/QZSS and BDS/QZSS based in the HKLT station
Summary
The four global satellite navigation systems, Global Positioning System (GPS), Global Navigation Satellite System (GLONASS), Galileo Satellite Navigation System (Galileo), and Beidou Satellite Navigation System (BDS) have enabled a wide range of applications for positioning, navigation and timing [1]. An early assessment of the newly available signal’s quality of the multi-GNSS (GPS + GLONASS + BDS + QZSS) was provided by computing zero-baseline double-differenced carrier phase residuals and it was found that all the available constellations can improve the precision and accuracy in both the horizontal and vertical components [14]. These results could not comprehensively reflect the current features of the QZSS constellation and its enhancement effect on GPS. The performance of the SFSE carrier phase DD baseline resolution for the integrated GPS/QZSS and BDS/QZSS in the Asia-Pacific region needs more attention.
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