顾及GNSS星载原子钟噪声分量的卫星钟差估计方法OA

Given the issue that multi-system satellite clock bias estimation is susceptible to interference from various noise types,an estimation model that fully considers the characteristics of satellite clock noise components is proposed.This model employs two strategies,namely sliding window and overall modeling,and utilizes the Hadamard variance to solve for noise parameters.Based on this,clock bias estimation and accuracy assessment are conducted.In the experimental section,multiple representa-tive satellites from the four major satellite navigation systems-GPS,BDS-3,Galileo,and GLONASS are selected as research subjects.A systematic comparative analysis is performed on the performance differences of the two modeling strategies across different systems and satellites.The experimental re-sults reveal that the BDS-3 exhibits significant inter-satellite variability.Specifically,most satellites in MEO demonstrate more pronounced time-varying noise characteristics,making them more suitable for the sliding modeling strategy.Conversely,for some satellites equipped with MEO rubidium clocks and stable IGSO satellites,the overall modeling strategy offers greater advantages.In the case of the Galileo,the global modeling strategy performs better.For the GPS and GLONASS,after adopting the sliding window strategy,the positioning accuracy in E,N,U directions improves by 10.34％,17.07％,and 4.30％,respectively,and by 6.27％,10.34％,and 3.76％,respectively,compared to the overall modeling strategy.