基于互联网的混合组播导航系统设计与仿真

摘要

Study the problem how to increase the location accuracy of Wide Area Differential Global Navigation Satellite System (DGNSS). In cities with many high -rise buildings or inside rooms, the signals of geosynchronous orbit(GEO)are blocked seriously and can not realize high - precision locating, while the traditional methods use Internet to transmission the information of navigation. To solve the problem, the paper constructed a layered mix multicasting system to broadcast the enhanced navigation information. According to the characteristics of enhanced information, we combined with application layer and i3 multicast, node -based heterogeneity, enhanced navigation information broadcast constructed hierarchical hybrid multicast system, analyzed the network model and communication protocol, and finally carried jout the simulation. The results show that the system has good scalability and real -time, and can meet the increased demand for information on large - scale real - time broadcasting. It also increases the locating precision and provides technical supports to practical applications%研究提高广域差分全球卫星导航系统(DGNSS)定位精度问题.由于高层建筑物较多的城市或者室内对全球同步轨道卫星(GEO)信号遮挡严重不能实现导航系统的高精确定位,传统方法使用互联网传输导航增强信息,不能有效提高精度.为解决上述问题,提出一种播发导航增强信息的分层混合组播系统.根据增强信息的特点,结合应用层和i3组播的方式播发增强修正信息.仿真结果表明,系统具有实时性,能够满足增强信息的大规模实时播发需求,有效地提高了导航系统的定位精度,为实际设计提供了依据.