GNSS空间信号连续性评估模型与算法

Algorithm and Evaluation Models of GNSS Signal-in-space Continuity

连续性是评估GNSS性能的重要指标之一。针对空间信号层面,提出了GNSS空间信号连续性的定义,给出了单颗卫星空间信号连续性的统一模型与算法,在此基础上,利用GNSS广播星历和顾及卫星中断数据开展了GPS/GLONASS/BDS/Galileo系统的空间信号连续性计算。结果表明:剔除计划中断后,BDS三类卫星GEO/IGSO/MEO空间信号连续性分别达到0.998 2、0.997 9和0.997。在未剔除计划中断情况下,GPS空间信号连续性优于0.999 8,GLONASS空间信号连续性优于0.999 7,Galileo系统空间信号连续性优于0.997。BDS和GPS卫星达到了各自系统制定的空间信号连续性标准。

Continuity is one of the most important indicators to assess the performance of GNSS.Against signal-in-space level,this paper presents the definition of GNSS SIS continuity,then gives the unified model and algorithm of single satellite SIS continuity.On this basis,we use the GNSS broadcast ephemeris data and consider the satellite interruption data to calculate the SIS continuity of GPS,GLONASS,BDS and Galileo system.The results showed that the three kinds of satellites GEO,IGSO,MEO of BDS SIS continuity have reached 0.998 2,0.997 9and 0.997 when we eliminate scheduled interruption.And in the case of not excluding scheduled interruption,the SIS continuity of GPS is better than 0.999 8,for GLONASS is better than 0.999 7,for Galileo system is better than 0.997.BDS and GPS satellites have reached the signal-in-space continuity standard which each system developed.