Abstract
The HY-2 satellite carrying a satellite-borne GPS receiver is the first Chinese radar altimeter satellite, whose radial orbit determination precision must reach the centimeter level. Now HY-2 is in the test phase so that the observations are not openly released. In order to study the precise orbit determination precision and procedure for HY-2 based on the satellite-borne GPS technique, the satellite-borne GPS data are simulated in this paper. The HY-2 satellite-borne GPS antenna can receive at least seven GPS satellites each epoch, which can validate the GPS receiver and antenna design. What’s more, the precise orbit determination processing flow is given and precise orbit determination experiments are conducted using the HY-2-borne GPS data with both the reduced-dynamic method and the kinematic geometry method. With the 1 and 3 mm phase data random errors, the radial orbit determination precision can achieve the centimeter level using these two methods and the kinematic orbit accuracy is slightly lower than that of the reduced-dynamic orbit. The earth gravity field model is an important factor which seriously affects the precise orbit determination of altimeter satellites. The reduced-dynamic orbit determination experiments are made with different earth gravity field models, such as EIGEN2, EGM96, TEG4, and GEMT3. Using a large number of high precision satellite-borne GPS data, the HY-2 precise orbit determination can reach the centimeter level with commonly used earth gravity field models up to above 50 degrees and orders.
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This research is supported partially by the National Natural Science Foundation of China (Nos. 40974004 and 40974016), the Key Laboratory of Dynamic Geodesy of CAS, China (No. L09-01), and the R&I Team Support Program and the Graduate Science and Technology Foundation of SDUST, China (No. YCA110403).
Guo Jin-Yun, Prof., PhD supervisor, received his PhD degree in Geodesy and Surveying Engineering from the Shandong University of Science and Technology in 2004. He has been a visiting professor working for the National Chiao Tung University, Taiwan, in 2002–2003 and 2005–2006 and for the National Astronomical Observatories, Chinese Academy of Sciences, from 2007 to now. Currently, he is a full-time professor at the Shandong University of Science and Technology at Qingdao with major interest in space geodesy, marine geodesy, and astrogeodynamics.
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Guo, JY., Qin, J., Kong, QL. et al. On simulation of precise orbit determination of HY-2 with centimeter precision based on satellite-borne GPS technique. Appl. Geophys. 9, 95–107 (2012). https://doi.org/10.1007/s11770-012-0319-3
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DOI: https://doi.org/10.1007/s11770-012-0319-3