QZSS增强GPS亚太地区服务性能评估

Performance Evaluation of GPS Service Combined with QZSS in Asia-Pacific Region

准天顶系统（QZSS）是由日本研制的区域性多任务卫星系统，主要用于增强亚太地区卫星导航的服务能力。本文从理论上分析了卫星导航系统服务性能的评估指标，分别给出精度、连续性和可用性三个服务性能指标的定义及计算方法，并利用MGEX站的实测数据，对QZSS在增强GPS在亚太地区服务性能的情况进行了较为全面的评估。结果表明，QZSS和GPS组合系统的服务性能较单GPS系统，在定位精度、连续性和可用性方面均有增强，当截止高度角较大时，Qzss对GPS服务性能的增强更明显。

Quasi-Zenith Satellite System （QZSS） is a regional multi-task satellite system developed by Japan, mainly used to enhance the service performance of satellite navigation in the Asia-Pacific region. The assessment parameters of service performance are analyzed in theory, the definition and calculation method of accuracy, continuity and availability are presented in this paper. Furthermore, the measured data of MGEX station are used to evaluate the performance of GPS service with QZSS enhancement. Results show that the service performance of GPS ＋ QZSS combination is better than that of GPS stand-alone in terms of positioning accuracy, continuity and availability, and the performance enhancement becomes more obvious when the elevation angle is greater.