Precise orbit determination for GRACE with zero-difference kinematic method  

作　　者：LI JianCheng ZHANG ShouJian ZOU XianCai JIANG WeiPing 

机构地区：[1]School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China [2]GNSS Researeh Center, Wuhan University, Wuhan 430079, China

出　　处：《Chinese Science Bulletin》2010年第7期600-606,共7页

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.40637034 and 40704004);the New Century Excellent Talents in University Program(Grant No.NCET-07-0633)

摘　　要：Thanks to the high performance of the spaceborne GPS receiver and the availability of precise IGS orbit and clock products,zero-difference kinematic precise orbit determination(POD) has been turned out to be a new effective method in orbit determination for the LEO satellites.Zero-difference kinematic POD,which is based on the GPS measurements only from the spaceborne GPS receiver,does not depend on the force models and orbit design.From this point of view,kinematic POD is suitable for the Earth observation satellites at very low altitudes,such as CHAMP,GRACE and GOCE,etc.This paper first reviews the basic zero-difference GPS observation model.Then a modified data quality control scheme is put forward.Finally,a block-wise least squares algorithm,which first separates the parameters into several groups and then solves the parameters by elimination and back-substitution,is discussed and proposed for the kinematic orbit determination.With the above algorithms,we developed kinematic POD software to solve the orbit suitable for one-week GRACE observations.Comparisons with the published Rapid Science Orbit(RSO) indicate that,using our approach to determine the orbit,the accuracy in the radial direction can achieve 3―4 cm for GRACE-A,and 3―5 cm for GRACE-B.Thanks to the high performance of the spaceborne GPS receiver and the availability of precise IGS orbit and clock products, zero-difference kinematic precise orbit determination （POD） has been turned out to be a new effective method in orbit determination for the LEO satellites. Zero-difference kinematic POD, which is based on the GPS measurements only from the spacebome GPS receiver, does not depend on the force models and orbit design. From this point of view, kinematic POD is suitable for the Earth observation satellites at very low altitudes, such as CHAMP, GRACE and GOCE, etc. This paper first reviews the basic zero-difference GPS observation model. Then a modified data quality control scheme is put forward. Finally, a block-wise least squares algorithm, which first separates the parameters into several groups and then solves the parameters by elimination and back-substitution, is discussed and proposed for the kinematic orbit determination. With the above algorithms, we developed kinematic POD software to solve the orbit suitable for one-week GRACE observations. Comparisons with the published Rapid Science Orbit （RSO） indicate that, using our approach to determine the orbit, the accuracy in the radial direction can achieve 3--4 cm for GRACE-A, and 3 --5 cm for GRACE-B.

关 键 词：轨道确定 运动学 零重力 星载GPS接收机 过氧化物酶 最小二乘算法 地球观测卫星 快速科学轨道 

分 类 号：P227[天文地球—大地测量学与测量工程] V556.3[天文地球—测绘科学与技术]