低轨导航星座增强BDS精密单点定位技术验证CSCD

首先介绍了低轨增强北斗精密单点定位(PPP)的观测模型、参数估计与数据处理策略。然后对低轨导航增强仿真验证系统及误差仿真配置进行了说明,基于验证系统仿真了全球20个监测站的北斗及低轨导航数据,并通过单北斗及低轨增强北斗静态PPP试验,给出了低轨增强北斗的高精度定位测试评估结果。结果表明,加入150颗低轨卫星观测量后,20个测站PPP精度收敛到10cm之内只需约1min;低轨增强北斗实现静态收敛后,定位精度东方向均值为1.5cm,北方向均值为0.3cm,高程方向均值为2.2cm。相较于北斗单独精密定位,20个监测站收敛后组合定位精度从5cm左右提升到3cm左右。加入低轨卫星可大大加快PPP收敛速度,提升定位精度,验证了低轨卫星在增强PPP精度和收敛速度上的优越性,同时仿真验证系统可支持全链路闭环仿真验证。

Point Positioning Technology Verification of BDS Enhanced with LEO Navigation Constellation

Firstly, the observation model, parameter estimation and data processing strategy of LEO enhanced BDS precise point positioning (PPP) are introduced. Then, the LEO navigation augmentation simulation verification system and error configuration are explained. The BDS and LEO navigation data of 20 monitoring stations around the world are simulated by the built LEO navigation augmentation verification system, and the single BDS and LEO enhanced BDS static PPP experiments verify the LEO enhanced BDS PPP algorithm. The results show that it only takes about 1 minute for the PPP positioning accuracy of the 20 stations to converge to within 10cm after adding LEO observations. The average value of the positioning accuracy is 1.5cm in the east direction, 0.3cm in the north direction, and the mean value in the elevation direction is 2.2cm. After the convergence of the 20 monitoring stations, combined positioning is more precise than BDS alone, the positioning accuracy is improved from about 5cm to about 3cm. The addition of LEO can greatly speed up the PPP convergence speed and improve the positioning accuracy, which verifies the superiority of LEO in enhancing the PPP positioning accuracy and convergence speed. The LEO navigation enhanced simulation verification system can support full-link closed-loop simulation verification.