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Precise orbit determination for GRACE with zero-difference kinematic method

ISSN号：1001-6538
期刊名称：Chinese Science Bulletin
时间：2010.3.3
页码：600-606
分类：P227[天文地球—大地测量学与测量工程;天文地球—测绘科学与技术] V556.3[航空宇航科学与技术—人机与环境工程;航空宇航科学技术]
作者机构：[1]School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China, [2]GNSS Researeh Center, Wuhan University, Wuhan 430079, China
相关基金：The present study makes use of the GPS observation data, attitude data and reference orbits from GFZ, on behalf of the GRACE project. GPS orbit and clock solutions are from the Center for Orbit Determination in Europe （CODE）. The authors gratefully acknowledge these contributions. Also, the authors are grateful to Profs. Chao D B and Shen W B for their helpful advice. This work was 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）.
相关项目：基于同解法解算卫星重力场模型的若干关键技术研究

作者： Li JianCheng|Zhang ShouJian|Zou XianCai|Jiang WeiPing|

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, GPS, orbit determination, POD, GRACE, kinematic, zero-difference

中文摘要：

由于卫星转菠的 GPS 接收装置的高效和精确 IGS 轨道和钟产品的可获得性，零差别的运动学的精确轨道决心(邮政部门) 被生产了是在为狮子座卫星的轨道决心的一个新有效方法。零差别的运动学的邮政部门，仅仅从卫星转菠的 GPS 接收装置基于 GPS 大小，不依靠力量模特儿和轨道设计。从这个观点，运动学的邮政部门对在很低的高度的地球观察卫星合适，例如捣烂，优雅和 GOCE，等等。这份报纸首先考察基本零差别的 GPS 观察模型。然后，一个修改数据质量控制计划被提出。最后，一个块明智的最少的广场算法，首先把参数分开成几个组然后由消除和背替换解决参数，为运动学的轨道决心被讨论并且求婚。与上述算法，我们开发了运动学的邮政部门软件解决对一个星期优雅观察合适的轨道。有出版快速的科学轨道(RSO ) 的比较显示那，用我们决定轨道的途径，在光线的方向的精确性能为 GRACE-B 为优雅 A，和 35 厘米完成 34 厘米。

英文摘要：

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 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.

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