RTK/B2b-PPP fusion switching positioning technology based on BDS-3/GPS
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摘要: 针对远海、沙漠等网络实时动态(real-time kinematic, RTK)载波相位差分技术通讯信号容易中断的应用场景，提出了一种基于北斗三号(BeiDou-3 Navigation Satellite System, BDS-3)/GPS双系统的RTK/B2b-PPP融合切换定位技术. 充分利用网络RTK收敛快、定位精度高和B2b-PPP单站定位、覆盖范围广的特点，将网络RTK获取的高精度位置坐标作为先验信息，与B2b-PPP融合以辅助B2b-PPP快速收敛. 通过分时段多组数据的采样分析，结果表明：RTK固定解与B2b-PPP融合定位精度在东(east，E)、北(north，N)、天顶(up，U)方向分别为2.57 cm、0.90 cm、2.83 cm，较独立B2b-PPP定位大幅提高；RTK固定解与B2b-PPP融合1 s后，便可帮助B2b-PPP瞬时收敛，RTK中断后初期精度达到厘米级，0.5 h后逐渐过渡到B2b-PPP独立定位精度水平，表明B2b-PPP可作为网络RTK的有效补充手段，在RTK差分中断后，能够有效维持高精度定位水平.
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关键词:
- 实时动态(RTK) /
- B2b-PPP /
- 北斗三号(BDS-3)/GPS组合 /
- 融合切换 /
- 收敛时间
Abstract: In order to solve the problem that network real-time kinematic (RTK) communication signals are easy to be interrupted in the remote sea and desert, a switching technology of RTK/B2b-PPP fusion based on BeiDou-3 Navigation Satellite System (BDS-3)/GPS is proposed, which makes full use of the characteristics of fast convergence and high positioning accuracy of network RTK and wide coverage,single station positioning of B2b-PPP. The high-precision position coordinates obtained by network RTK are used as priori information and integrated with B2b-PPP to assist B2b-PPP converge fast. The results show that the positioning accuracy of RTK fixed solution and B2b-PPP fusion is 2.57 cm, 0.90 cm and 2.83 cm in the east (E), north (N) and up (U) directions, respectively, which is much higher than that of independent B2b-PPP positioning. In addition, after the fusion of RTK fixed solution and B2b-PPP for 1 s, it can help the instantaneous convergence of B2b-PPP. After the interruption of RTK, the initial accuracy reaches the level of cm, and gradually transitions to the independent positioning accuracy level of B2b-PPP after 0.5 h, indicating that B2b-PPP can be used as an effective means to supplement the network RTK. Can effectively maintain high precision positioning level.-
Key words:
- RTK /
- B2b-PPP /
- BDS-3/GPS combination /
- fusion switching /
- convergence time
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表 1 非差非组合PPP模型信息与误差处理策略
模型信息/误差项 处理策略 选用频率 BDS-3：B1I、B3I；GPS：L1、L2 卫星钟差 PPP-B2b钟差改正数 卫星轨道误差 PPP-B2b轨道改正数 卫星硬件延迟 PPP-B2b DCB改正数 卫星天线相位中心偏差 模型估计 电离层延迟 参数估计+随机游走 对流层延迟 参数估计+随机游走 地球自转效应 模型估计 相对论效应 模型估计 潮汐影响 模型估计 接收机钟差 参数估计+白噪声 接收机硬件延迟 包含在接收机钟差中估计 整周模糊度 参数估计+随机游走 周跳探测 MW+GF 截止高度角 10° 
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