摘要
针对多频的加入会带来诸如频间偏差、频间钟差偏差等问题,该文基于原始观测方程推导出适用于卫星播发频率不一致的三频无电离层(IF)两两组合模型,在原始全球导航卫星系统(GNSS)观测方程的基础上推导了一种适用于多系统的三频无电离层组合精密单点定位(PPP)模型,顾及了对差分码偏差、频间偏差等误差项的处理,并通过静态测站和动态车载试验数据评估了三频无电离层组合PPP模型的定位性能。结果表明:静态环境下,第三频的加入能使单全球定位系统(GPS)在17.9 min完成收敛后达到0.96、0.57、1.30 cm的定位精度,收敛时间提升了24.5%,平面精度提升了11.9%和10.9%,但对天顶方向的精度没有提升;而对于多系统组合,第三频的加入对收敛时间和定位精度均有明显的提升。GPS/Galileo/BDS组合PPP精度能达到0.73、0.49、1.21 cm,提升了25.5%、19.7%、24.4%;收敛时间为10.70 min,提升了34.2%。动态环境下,采用三频观测值的E+C方案的PPP精度可以达到0.29、0.09、0.23 m,提升了23.7%、35.7%、54.9%;G+E+C方案能达到0.11、0.04、0.21 m的三维定位精度,分别提升了21.4%、42.9%、16%。
In this paper,the two combinations of the three frequency if two combinations were derived based on the original observation equation,which was based on the original GNSS observation equations,a triple-frequency ionosphere-free combined precise point positioning(PPP)model for multi-systems was derived with taking into account the handling of error terms such as differential code bias and inter-frequency bias.The positioning performance of the triple-frequency ionosphere-free combined PPP model was evaluated by the data of static stations and dynamic on-board test.The results showed that:in the static environment,the addition of the third frequency could enable the single GPS system to achieve positioning accuracies of 0.96,0.57 and 1.30 cm after completing the convergence in 17.9 min,with an improvement of 24.5%in the convergence time and 11.9%and 10.9%in the horizontal accuracy,but there was no improvement in the accuracy for vertical direction;whereas,for the multi-system combination,the addition of the third frequency had significant effects on the convergence time and positioning accuracy were significantly improved.The PPP accuracy of the combination GPS/Galileo/BDS could reach 0.73,0.49 and 1.21 cm,which was improved by 25.5%,19.7%,and 24.4%;and the convergence time was 10.70 min,which was improved by 34.2%.Under the dynamic environment,the PPP accuracy of the E+C solution with three-frequency observations could reach 0.29,0.09 and 0.23 m,which was improved by 23.7%,35.7%,and 54.9%;and the G+E+C solution could achieve 3D positioning accuracy of 0.11,0.04 and 0.21 m,which was improved by 21.4%,42.9%,and 16%,respectively.
作者
刘席天
高井祥
余志浩
吴志远
LIU Xitian;GAO Jingxiang;YU Zhihao;WU Zhiyuan(Shenzhen Zhongjin Lingnan Nonfemet Fankou Mine Co.,Ltd.,Shaoguan,Guangdong 512000,China;School of Environment and Surveying and Mapping,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;Guangzhou Hi-target Navigation Tech Co.,Ltd.,Guangzhou 510000,China)
出处
《测绘科学》
CSCD
北大核心
2023年第10期10-19,共10页
Science of Surveying and Mapping
基金
国家自然科学基金面上项目(41974026)。
