低纬地区和极区常见的电离层闪烁可对全球卫星导航系统信号造成随机扰动，在传统精密单点定位（PPP）模型中引入未模型化电离层散射残差，劣化PPP定位性能。惯性导航系统（INS）凭借其短期高精度、不受外界干扰影响的特点，可与PPP构成PPP/INS组合导航系统，提升复杂环境中导航性能。然而，当前电离层闪烁环境中INS辅助PPP机理研究和性能分析尚不完善。因此，从PPP/INS松、紧组合模型和参数估计入手，分析电离层闪烁对松、紧组合数据处理的影响。最后，采用香港2个测站的实测电离层闪烁期间的GPS观测数据和仿真INS数据验证电离层闪烁环境下PPP/INS性能。理论分析和实验表明，PPP/INS紧组合系统在电离层闪烁环境中性能显著优于松组合。在实验期间的电离层闪烁干扰下，PPP/INS紧组合相对于松组合分别提升56.6%和34.0%的水平和垂直定位精度，77.5%和79.5%的水平和垂直速度精度，85.6%、49.6%和88.9%的俯仰、横滚和航向精度。

Ionospheric scintillations in low latitude and polar regions can introduce random interference in GNSS signals， deteriorating the conventional PPP performance with the unmodelled ionospheric scattering residual. The short-term high accuracy and interference-free INS can assist PPP to form PPP/INS integrated navigation system， improving the navigation performance in the sophisticated environment. However， the mechanism and performance of INS assisting PPP with scintillations requires further research. Thus， starting with the model and estimation process， impacts of ionospheric scintillation on the data processing of PPP/INS tightly and loosely coupled systems is analyzed. Then， we apply scintillation-impacted GPS data from 2 stations in Hong Kong and simulated INS data to validate the PPP/INS performance. Theoretical analysis and experiments indicate the superiority of the tightly coupled system in the ionospheric scintillation environment.. During the experiment， the tightly coupled system improves 56.6% and 34.0% horizontal and vertical positioning accuracy， respectively； 77.5% and 79.5% horizontal and vertical velocity accuracy， respectively； 85.6%， 49.6% and 88.9% pitch， roll and yaw accuracy， respectively as compared with the loosely coupled system.