Enhanced baseline determination for formation flying LEOs by relative corrections of phase center and code residual variations  

作　　者：Bin YI Defeng GU Bing JU Kai SHAO Houzhe ZHANG 

机构地区：[1]College of Liberal Arts and Sciences,National University of Defense Technology,Changsha 410073,China [2]TianQin Research Center for Gravitational Physics and School of Physics and Astronomy,Sun Yat-sen University(Zhuhai Campus),Zhuhai 519082,China [3]National Key Laboratory of Science and Technology on Aerospace Flight Dynamics,Beijing Aerospace Control Center,Beijing 100094,China

出　　处：《Chinese Journal of Aeronautics》2022年第2期185-194,共10页中国航空学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.41874028,61803018)。

摘　　要：Formation flying Low Earth Orbiters(LEOs)are important for implementing new and advanced concepts in Earth observation missions.Precise Baseline Determination(PBD)is a prerequisite for LEOs to complete specified mission targets.PBD is usually performed based on space-borne GNSS data,the relative corrections of phase center and code residual variations play crucial roles in achieving the best relative orbit accuracy.Herein,the influences of antenna Relative Phase Centre Variations(RPCVs)and Single-Difference(SD)Melbourne-Wu¨bbena(MW)Combination Residuals Variations(SD MWVs)on PBD are studied.The methods were tested using flight data from Gravity Recovery And Climate Experiment(GRACE)and GRACE Follow-On(GRACE-FO).Results showed that the maximum values for RPCVs and SD MWVs were 14 mm and 0.32 cycles,respectively.Then,the RPCVs correction significantly enhanced the baseline accuracy;the K-Band Ranging(KBR)measurement consistency improved by 30.1%and 37.5%for GRACE and GRACE-FO,respectively.The application of SD MWVs further improved the accuracy and reliability of PBD results.For GRACE,the ambiguities fixing success rate increased from 85.1%to 97.9%and a baseline consistency of 0.57 mm was achieved for the KBR measurements.It was found that the correction of both RPCVs and SD MWVs reduced the carrier phase observation minus computation residuals from double-difference ionosphere-free combination.In addition,in-flight data processing demonstrated that RPCVs and SD MWVs estimations for the current period could be used for the previous and subsequent periods.

关 键 词：Ambiguity resolution Formation flying Precise baseline determination(PBD) Relative phase centre variations(RPCVs)estimation SD MW combination residuals variations(SD MWVs)estimation 

分 类 号：V448[航空宇航科学与技术—飞行器设计]