联合BDS/GPS的北斗广域差分实时电离层延迟格网改正方法研究

Research on Beidou Wide Area Real-Time Differential Ionospheric Delay Grid Correction Based on BDS/GPS Observations

研究并实现中国区域北斗广域差分实时电离层延迟格网改正算法,针对北斗单系统实时建立电离层延迟格网的不足,提出联合BDS/GPS的北斗广域差分实时电离层延迟改正方法。比较BDS、GPS以及BDS/GPS观测的实时电离层延迟格网,并利用北斗单频单点伪距定位进行精度验证。结果表明,在有效格网点覆盖充足的地区,BDS与GPS实时电离层延迟格网定位效果相当;而联合BDS/GPS观测的实时电离层延迟格网极大提高了偏远地区的单频定位精度与可定位历元数,也使原本单系统格网覆盖充足的地区定位效果得到进一步增强和稳定。

This paper studies the realization of the Beidou wide-area differential real-time ionospheric delay grid correction algorithm in China,and the short-term establishment of the ionospheric delay grid for the Beidou system.Results of BDS-only,GPS-only,and BDS/GPS combined ionospheric delay grid corrections are analyzed and compared.Results show that BDS-only and GPS-only ionospheric delay grid corrections performance are equivalent in the region,with sufficient effective grid point coverage,and the BDS/GPS combined ionospheric delay grid corrections have higher accuracy and improve the positioning accuracy of single frequency user.