北斗三号全球导航卫星系统服务性能评估:定位导航授时、星基增强、精密单点定位、短报文通信与国际搜救
摘要
With algorithm and methods provided, performance of BDS-3 services including PNT (positioning, navigation and timing), SBAS (satellite-based augmentation system), PPP (precise point positioning), SMC (short message communication) and SAR (search and rescue) is evaluated using different measurement data. Results show that signal in space(SIS) accuracy is 0.23 m(RMS), SIS availability is 99.44%, SIS continuity is 99.99%, PDOP availability is 100%, positioning accuracy is 1.3 m in horizontal and 2.09 m in vertical direction, positioning availability is 99.93% and timing accuracy is 14.7 ns(95%) for PNT service. For SBAS, positioning accuracy in horizontal direction is 1.03 m and in vertical direction is 2.60 m (95%), APV-I availability is 100%. For PPP service, positioning accuracy is 0.17 m(95%) in horizontal direction and 0.22 m(95%) in vertical direction, the average convergence time is 9 min. For regional short message communication, the communication success rate is 99.6%, the communication capacity is 15.3 million times per hour(uplink), 9.35 million times per hour(downlink); while for global short message communication, communication success rate is 96.46%, communication capacity is 0.4 million times per hour (uplink), 0.21 million times per hour (downlink). For search and rescue service, the receiving success rate is 98.3%(with sending power 37 dBm).