Application of variance component estimation(VCE)in orbit determination with low Earth orbit(LEO)satellite constellation
In recent years,low Earth orbit(LEO)satellite constellations have become a hot topic.Precise orbit determination of these LEO satellites is one of the fundamental requirements.In addition to traditional observations from ground stations,inter-satellite link(ISL)is often proposed as an effective way to improve constellation autonomy and orbit accuracy.However,due to the different characteristics and accuracies of two types of observations,combing these data for orbit determination requires additional attention.Variance component estimation(VCE)is one of the commonly used methods to adjust the weights of multi-source data.This simulation study investigates the application of VCE in LEO satellite orbit determination using both ground tracking and ISL data.Without VCE,by applying an equal weight to both types of observations,orbit errors are about two times larger than by applying the computed weights using VCE.We also show that for computation efficiency,a simplified VCE algorithm is more favorable.For a constellation with 120 satellites,this simplified algorithm is more than 2400 times faster without losing orbit accuracy.We also discuss the impact of modelling errors on VCE.The estimated variance components are contaminated by the modelling errors and are deviated from the true measurement accuracy.
Variance component estimation LEO satellites Inter-satellite link Orbit determination
Xingchi He Urs Hugentobler Yufeng Nie Bingbing Duan
Institute for Astronomical and Physical Geodesy,Technical University of Munich,Arcisstr.21,80333 Mun College of Surveying and Geo-Informatics,Tongji University,Siping Road 1239,200092 Shanghai,China
国内会议
北京
英文
1-12
2022-12-01（万方平台首次上网日期，不代表论文的发表时间）