It is an effective method to broadcast the augmentation information of satellite navigation system using GEO technology.However,it becomes difficult to receive GEO signal in some special situation,for example in citie...It is an effective method to broadcast the augmentation information of satellite navigation system using GEO technology.However,it becomes difficult to receive GEO signal in some special situation,for example in cities or canyons,in which the signal will be sheltered by big buildings or mountains.In order to solve this problem,an Internet-based broadcast network has been proposed to utilize the infrastructure of the Internet to broadcast the augmentation information of satellite navigation system,which is based on application-layer multicast protocols.In this paper,a topology and position aware overlay network construction protocol is proposed to build the network for augmentation information of satellite navigation system.Simulation results show that the new algorithm is able to achieve better performance in terms of delay,depth and degree utilization.展开更多
星基增强系统(SBAS,satellite based augmentation system)的出现可有效提升全球卫星导航系统核心星座的各项性能,因其能够产生较高精度的定位信息以提供更加安全的导航服务,被广泛应用于民航领域中。利用SBAS服务区域内不同监测站接收...星基增强系统(SBAS,satellite based augmentation system)的出现可有效提升全球卫星导航系统核心星座的各项性能,因其能够产生较高精度的定位信息以提供更加安全的导航服务,被广泛应用于民航领域中。利用SBAS服务区域内不同监测站接收的导航和增强报文等实测数据,研究了定位精度和完好性报文处理过程以及可见星质量、定位误差、保护级和告警门限等完好性参数指标。针对完好性监测所要求的故障检测能力,分析不同故障函数时卫星的完好性服务能力,最后完成SBAS故障卫星的检测与排除。结果表明:根据报文解码及各项参数提取算法能够得到较好的精度和完好性结果,各地面站精度都符合LPV-200进近时的要求;美国本土中部地区完全满足LPV-200进近的完好性服务要求,边缘地区监测站除个别时刻外均满足LPV进近的完好性服务要求;排除故障卫星后,服务性能基本与未发生故障时性能相近。展开更多
基金supported by National High Technical Research and Development Program of China (863 Program) under Grant No. 2009AA12Z322
文摘It is an effective method to broadcast the augmentation information of satellite navigation system using GEO technology.However,it becomes difficult to receive GEO signal in some special situation,for example in cities or canyons,in which the signal will be sheltered by big buildings or mountains.In order to solve this problem,an Internet-based broadcast network has been proposed to utilize the infrastructure of the Internet to broadcast the augmentation information of satellite navigation system,which is based on application-layer multicast protocols.In this paper,a topology and position aware overlay network construction protocol is proposed to build the network for augmentation information of satellite navigation system.Simulation results show that the new algorithm is able to achieve better performance in terms of delay,depth and degree utilization.
文摘星基增强系统(SBAS,satellite based augmentation system)的出现可有效提升全球卫星导航系统核心星座的各项性能,因其能够产生较高精度的定位信息以提供更加安全的导航服务,被广泛应用于民航领域中。利用SBAS服务区域内不同监测站接收的导航和增强报文等实测数据,研究了定位精度和完好性报文处理过程以及可见星质量、定位误差、保护级和告警门限等完好性参数指标。针对完好性监测所要求的故障检测能力,分析不同故障函数时卫星的完好性服务能力,最后完成SBAS故障卫星的检测与排除。结果表明:根据报文解码及各项参数提取算法能够得到较好的精度和完好性结果,各地面站精度都符合LPV-200进近时的要求;美国本土中部地区完全满足LPV-200进近的完好性服务要求,边缘地区监测站除个别时刻外均满足LPV进近的完好性服务要求;排除故障卫星后,服务性能基本与未发生故障时性能相近。
