摘要
介绍了卫星导航系统基本性能指标及其评估方法,依据圆概率误差(CEP)、双倍距离均方根差(2DRMS)方法,对测点定位精度进行了分析。首先,仿真分析了实测数据下精度因子(DOP)与可见星数目的变化关系。然后,统计分析了测点在不同飞行阶段下的接收机自主完好性监测可用性和服务连续性时间百分比。结合实测数据的仿真分析结果表明:可见星数目大于7颗,能够满足定位要求;测点在95%置信概率条件下,三维定位精度优于20 m,水平精度优于15 m,垂直精度优于20 m,该服务精度满足飞行非精密进近(NPA)阶段导航性能要求。
The basic performance indicators and evaluation methods of satellite navigation system are introduced. Point- measuring accuracy is analyzed based on CEP and 2DRMS. Change relationship between DOP and number of visible SV is analyzed with actual measurement data. Different flight phase availability and time percentage of service continuity of receiver autonomous integrity monitoring are counted and analyzed at the measuring point. Experimental data analysis shows that the number of SV is greater than 7, which can meet the requirement for SV number in user positioning process. Under the condition of 95% probability, the 3D positioning accuracy is better than 20 m, the horizontal accuracy is better than 15 m, the vertical precision is better than 20 m, this service precision satisfies the requirements of navigation performance of NPA flight phase.
出处
《中国民航大学学报》
CAS
2017年第2期11-15,共5页
Journal of Civil Aviation University of China
基金
民航安全能力建设项目(AADSA0007)
中央高校基本科研业务费专项(20001006)
中电科54所新技术研究高校合作项目(KX14260033)
关键词
北斗区域导航系统
定位精度
接收机自主监测
系统可用性
系统连续性
BeiDou regional navigation system
positioning accuracy
receiver autonomous monitoring
system availabili-ty
system continuity
