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精密单点定位(PPP)具有无需地基网络优势,但其收敛性能常受限于中高轨卫星几何结构。BDS-3 PPP-B2b虽提供了实时星基服务,但收敛速度仍有提升空间。为此,本文提出一种低轨卫星(LEO)增强的PPP-B2b融合定位方法。通过构建极轨LEO星座生成仿真观测值,并与实测PPP-B2b数据进行联合解算。基于四个测站的实验结果表明,引入LEO显著增强了系统可观测性,相较于单BDS PPP-B2b,融合定位的E、N、U三方向的RMSE最优提升70%以上,平均收敛时间大幅缩短至57.7 s。此外,在模拟遮挡环境下,该方法仍能保持稳健的几何增强效果。研究证实了LEO可在不依赖地面网络条件下,为弱通信场景提供快速收敛的高精度定位服务。
Abstract:Precise Point Positioning (PPP)offers the advantage of not requiring ground-based networks,yet its convergence is often limited by the geometry of medium- and high-orbit satellites. While the BDS-3 PPP-B2b provides real-time satellite-based services,its convergence speed still requires improvement. To address this,this paper proposes a fused PPP-B2b positioning method enhanced by Low Earth Orbit (LEO)satellites. A polar-orbiting LEO constellation was simulated to generate observations,which were then jointly estimated with real PPP-B2b data. Experimental results from four stations demonstrate that introducing LEO significantly enhances system observability. Compared to single BDS PPP-B2b,the RMSE in the east,north,and up directions improved by over 70%,and the average convergence time was significantly reduced to 87.5 s. Furthermore,the method maintains robust geometric enhancement even in simulated obstructed environments. This study confirms that LEO can provide fast-converging,high-precision positioning for weak-communication scenarios without relying on ground infrastructure.
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基本信息:
DOI:10.14188/j.2095-6045.20250575
中图分类号:TN967.1;P228
引用信息:
[1]徐江涛,孙云晓,朱道华,等.基于低轨卫星增强的PPP-B2b精密单点定位方法[J].测绘地理信息().DOI:10.14188/j.2095-6045.20250575.
基金信息:
国网江苏省电力有限公司科技项目(J2024159)
2026-05-14
2026-05-14
2026-05-14