QZSS导航系统在亚太地区的初步性能评估

摘要

The Quasi-Zenith Satellite System (QZSS) is developed by JAXA of Japan.It is a regional satellite navigation and augmentation system.The service performance of QZSS in Asia-Pacific region was evaluated and analysed from the aspects of visibility,location service and augmentation service based on measured data.The results show that:QZSS improves Japan's usability of GNSS most significantly among Asia-Pacific region.The performance of positioning accuracy,availability and reliability of GPS aided with QZSS is better than that of GPS-only mode,and this advantage is more obvious under a high cut-off elevation angle condition.The augmentation service provided by L1-SAIF signal of QZSS can significantly improve the accuracy of real-time navigation of GPS system.%QZSS系统是由日本宇宙航空研究开发机构研发和实施的区域性卫星导航及增强系统.利用实测数据分别从系统可见性、定位服务和增强服务三个方面就QZSS系统在亚太地区的服务性能展开评估分析.结果显示:QZSS系统对日本测区的可用性提升最为显著;有QZSS系统协同配合的GPS系统的定位精度、可用性和可靠性较单一GPS系统均有提升,尤其在高截止高度角情况下这种改善更为显著;QZSS系统提供的L1-SAIF增强信号能显著提升GPS系统实时导航的精度.