XU XinYu,
JIANG WeiPing,
ZHANG XiaoMin et al
.2018.Ability of recovering the global gravity field of a new satellite gravimetry system Chinese Journal of Geophysics(in Chinese),61(6): 2227-2236,doi: 10.6038/cjg2018L0270
1. School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China;
2. Research Center of Global Navigation Satellite System, Wuhan University, Wuhan 430079, China;
3. DFH Satellite Co. LTD, Beijing 100094, China;
4. Satellite Surveying and Mapping Application Center, National Administration of Surveying, Mapping and Geoinformation, Beijing 100048, China;
5. Collaborative Innovation Center of Geospatial Technology, Wuhan University, Wuhan 430079, China
A new satellite gravimetry mode combining SST-hl, SST-ll and SGG is proposed in this paper. This mode can benefit from advantages of the SST-ll and SGG modes to a certain extent. The ability to recover the gravity field model using the new satellite gravimetry mode is analyzed in detail based on the semi-analytical approach used for the indicator design of the satellite gravimetry system. The different parameter settings of the gravity measurement satellite systems, different observations and corresponding different white noise levels are considered in the test.The results of numerical simulation show that the orbital height is the key factor that affects the ability of recovering the gravity field in the same condition with the same observation accuracy and inter-satellite range. With the increase of inter-satellite range, the accuracy of inversed high-frequency gravity field signal will be improved first and then decreased. And the optimal inter-satellite range is between 150 km and 180 km when the orbital height changes from 200 km to 350 km. The inter-satellite range rate and the satellite gravity gradients are complementary to each other only in certain precision configurations. If the accuracy of one type of observations was very high, another type of observations would contribute not too much or don't contribute to the combined solution.When the inter-satellite range rate observations have high accuracy, almost all frequency bands of the gravitational field model are contributed by the inter-satellite range rate of observations. At the orbit height of 300 km, when the accuracies of the inter-satellite range rate and gravitational gradient observations in the new gravimetric satellite system are 1 μm·s-1/√Hz and 5 mE/√Hz, respectively which correspond to the design indicators of GRACE and GOCE missions, and the accuracy of the recovered gravity field model up to the degree and order 200 is 1.2 times and 2.8 times higher than the ones derived independently. In order to realize the scientific objective of 1~2 cm accuracy geoid with the 100 km spatial resolution, the proposed orbital height is 300 km in terms of the satellite operating life. And the corresponding accuracies of the inter-satellite range rate and the satellite gravity gradient are 0.1 μm·s-1/√Hz and 1 mE/√Hz, respectively. The research results of this paper could be a technique reference for developing the autonomous gravity measurement satellite system of China.
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