摘要
为了评估广域增强系统(wide area augmentation system,WAAS)中地球静止轨道(geostationary earth orbit,GEO)卫星数对WAAS性能的影响,正确解码WAAS报文,对比分析GEO卫星和全球定位系统(global positioning system,GPS)卫星的伪距改正值和用户差分距离误差指数;将GEO卫星纳入导航定位解算,并基于WAAS监测站实测数据,解算分析GEO卫星数对WAAS报文延迟、中断和导航性能的影响。结果表明:当现有GPS卫星均正常工作时,GEO卫星数的增加可有效降低报文的延迟和中断,但对WAAS定位精度和完好性的提升并不明显。星基增强系统(satellite-based augmentation system,SBAS)中有两颗正常工作的GEO卫星是比较理想的状况。
In order to evaluate the influence of the number of satellites in the geostationary earth orbit(GEO)in the wide area augmentation system(WAAS)on the performance of WAAS.The WAAS messages were decoded correctly,and the pseudo-range modifiers and user differential range error indices of GEO satellites and global positioning system(GPS)satellites were compared and analyzed.GEO satellites were included in the navigation and positioning solution.Based on the measured data of WAAS monitoring station,the effects of the number of GEO satellites on WAAS message delay,interruption and navigation performance were calculated and analyzed.The results show that when the existing GPS satellites are working normally,the increase of the number of GEO satellites can effectively reduce the delay and interruption of messages,but the improvement of positioning accuracy and integrity of WAAS is not obvious.It is ideal to have two GEO satellites in satellite-based augmentation system(SBAS).
作者
倪育德
王子成
NI Yu-de;WANG Zi-cheng(College of Electronics Information and Automation,Civil Aviation University of China,Tianjin 300300,China;Key Laboratory of Airworthiness Certification of Civil Aviation Aircraft,Civil Aviation Administration of China,Tianjin 300300,China)
出处
《科学技术与工程》
北大核心
2021年第16期6737-6745,共9页
Science Technology and Engineering
基金
国家重点研发计划(2016 YFB0502402)。
