High-Precision Inter-Satellite Baseline Determination Method for Lutan-1 Based on BDS-3
Objectives:Lutan-1(LT-1)is the first formation-flying mission of China,enabling interfero-metry synthetic aperture radar(InSAR)in the L-band.High-precision inter-satellite baseline is crucial for InSAR processing and application.Methods:We investigate the dynamic precise baseline solution method and the inter-satellite double-difference ambiguity fixing method of low-orbit formation satellite,and ana-lyze the contribution of BDS-3(BIC,B2a)and GPS(LI,L2)observation of LT-1 A/B in precise base-line determination.Results:The results show that compared with GPS,the residuals of BIC and B2a ob-servations of BDS-3 are significantly smaller,suggesting a higher signal accuracy.The baseline overlap ac-curacies of GPS-based,BDS-based,and GPS/BDS combined solutions are 0.8 mm,0.6 mm,and 0.5 mm,respectively.The BDS-based baseline accuracy is 25％ higher than that of GPS,and the GPS/BDS combined solution can further improve the baseline accuracy by 37.5％ and 16.7％ relative to the GPS-and BDS-baselines.The baseline difference between the GPS-based and BDS-based baseline solutions is 1 mm in 3 dimensional directions.Conclusions:The analysis suggests that the single BDS-3 system can achieve precise baseline determination for low-orbit formation satellites at the 1 mm level and combined GPS/BDS solution will further improve the accuracy than single-system solution.
万方数据
维普
