北斗星基增强系统单频服务区域可用性评估

Regional Single Frequency Service Availability Evaluation of BDSBAS

在研究美国广域增强系统(WAAS)与欧洲地球同步导航重叠系统(EGNOS)服务可用性评估方法的基础上,基于连续8天的实测数据对当前北斗星基增强系统(BDSBAS)单频服务一类垂直引导进近(APV-I)的区域可用性进行了初步评估。评估结果表明,受系统实际播发的卫星完好性参数有效性与电离层格网点(IGP)分布的限制,中国大陆APV-I 99%可用性覆盖率仅为49%,且在中国陆地边界和沿海地区性能迅速劣化;进一步仿真验证了在当前IGP均可用的条件下,APV-I 99%可用性理论最大覆盖率为96.22%,而在增加高纬度IGP后,覆盖率进一步提升为100%,可以解决中国高纬度地区可用性较差的问题。

Based on the study of the service availabililty evaluation method of WAAS and EGNOS,the availability coverage of APV-I of BDSBAS single frequency service is preliminarily evaluated based on the measurement data of 8 consecutive days.The evaluation results show that the APV-I 99%availability coverage rate is only 49%in the mainland of China,and is deteriorated rapidly in China's land boundary and coastal areas.Further simulation results show that under the current IGP configuration,the maximum coverage of APV-I 99%availability is 96.22%theoretically.After increasing the high latitude IGP,the coverage rate will be further increased to 100%,which can solve the problem of poor BDSBAS B1C single frequency APV-I service availability in China's high latitude regions.