On simulation of precise orbit determination of HY-2 with centimeter precision based on satellite-borne GPS technique*
Guo Jin-Yun1, 2, Qin Jian1, 2, Kong Qiao-Li1, 2, and Li Guo-Wei1
1. College of Geodesy and Geomatics, Shandong University of Science and Technology, Qingdao 266590, China.
2. Key Laboratory of Surveying and Mapping Technology on Island and Reef of NASMG, Qingdao 266590, China.
Abstract：
The HY-2 satellite carrying a satellite-borne GPS receiver is the fi rst 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 satelliteborne 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 fl ow 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 fi eld models up to above 50 degrees and orders.
GUO Jin-Yun,QIN Jian,KONG Qiao-Li et al. On simulation of precise orbit determination of HY-2 with centimeter precision based on satellite-borne GPS technique*[J]. APPLIED GEOPHYSICS, 2012, 9(1): 95-107.
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