北斗三号系统PPP-B2b信号定位服务模型及性能分析

Model and Performance Analysis for BDS-3 PPP-B2b Signal Positioning Service

关键词:  北斗三号  精密单点定位  PPP-B2b  增强改正模型  定位精度  收敛性

Key words:  BDS-3  Precise point positioning  PPP-B2b  Enhanced correction model  Positioning accuracy  Convergence

摘要:

给出了PPP-B2b信号定位的观测模型和随机模型，详细阐述了PPP-B2b增强改正模型和参数估计模型，并进行了静态和动态定位实验。结果表明：对于单系统，在30min的收敛时间内，北斗三号定位精度可以达到水平0.118m（静态）、0.176m（动态），高程0.208m（静态）、0.423m（动态）以内，GPS定位精度可以达到水平0.113m（静态）、0.163m（动态），高程0.206m（静态）、0.377m（动态）以内；对于北斗三号/GPS双系统，在20min的收敛时间内，定位精度可以达到水平0.092m（静态）、0.122m（动态），高程0.158m（静态）、0.312m（动态）以内。无论是收敛性还是定位精度，均能满足北斗三号精密单点定位服务指标的要求。

Abstract:

In this paper, the observation model and random model of PPP-B2b signal of positioning are given, the enhanced correction model and estimation model of PPP-B2b are described in detail, and the static and dynamic positioning experiments are carried out. The results show that for single system, within 30 minutes of convergence, BDS-3 positioning accuracy can reach 0.118m (static) and 0.176m (dynamic) in horizontal direction, and 0.208m (static) and 0.423m (dynamic) in vertical direction. GPS positioning accuracy can reach 0.113m (static) and 0.163m (dynamic) in horizontal direction， and 0.206m (static) and 0.377m (dynamic) in vertical direction. For BDS-3/GPS dual system, within 20 minutes of convergence, the positioning accuracy can reach 0.092m (static) and 0.122m (dynamic) in horizontal direction， and 0.158m (static) and 0.312m (dynamic) in vertical direction. Both convergence and positioning accuracy can meet the requirements of BDS-3 precise point positioning service index.