Calibration for GOCE Gradiometer Data Based on the Prior Gravity Models

doi:10.11947/j.JGGS.2019.0403

Abstract

Abstract:

The determination of the calibration parameters of the gravity gradiometer play an important role in the GOCE gravity gradient data processing. In this paper, the temporal signals and outliers in the GOCE gravity gradient observations are analyzed. Based on the different global gravity field models, the scale factors and biases are determined in all the components of GOCE gravity gradients. And then the accuracy of the calibration results is validated. The results indicated that the effect of the ocean tide is at mE magnitude in the measurement band, which is equivalent to the precision of the gravity gradiometer, while the effect of the non-tide temporal signals, such as terrestrial water is in the order of 10 ^-4E, is slightly less than that of the ocean tide. The outliers in all the gravity gradient components are larger than 0.2%. And after the calibration using global gravity field models except EGM96, the stability of scale factors in the V_xx、V_yy、V_zz、V_yz components reaches 10 ^-4 magnitude, and the V_xz component reaches 10 ^-5 while that of the V_xy component is about 10 ^-2, which are in accordance with the accuracy differences of the gradient components.

Key words: GOCE; gravity gradient; calibration; scale factor; bias

Qingliang QU,Xiaotao CHANG,Shengwen YU,Guangbin ZHU. Calibration for GOCE Gradiometer Data Based on the Prior Gravity Models[J]. Journal of Geodesy and Geoinformation Science, 2019, 2(4): 21-30.

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Components	V_xx	V_yy	V_zz	V_xy	V_xz	V_yz
Number of outliers	43800	29401	26600	26445	30459	27962
Outliers ratio/(%)	0.39	0.26	0.23	0.23	0.27	0.24

Time/week	EGM96	EGM2008	GIF48	EIGEN-6C4	GGM05S	SPW5	SGG-UGM-1
1	19.4721	19.2243	19.2233	19.2228	19.2304	19.2230	19.2231
2	19.3881	19.1173	19.1151	19.1148	19.1231	19.1154	19.1155
3	19.4705	19.1470	19.1500	19.1492	19.1578	19.1502	19.1500
4	19.2798	19.0056	19.0037	19.0038	19.0126	19.0039	19.0039
5	19.4828	19.1985	19.1969	19.1962	19.2045	19.1968	19.1969
6	19.0158	18.7123	18.7143	18.7133	18.7208	18.7141	18.7140
7	19.2823	19.0143	19.0117	19.0120	19.0204	19.0124	19.0121
8	21.5612	21.2240	21.2253	21.2254	21.2372	21.2260	21.2257
9	23.5320	23.1676	23.1685	23.1673	23.1816	23.1683	23.1679
10	19.1991	18.9280	18.9247	18.9247	18.9321	18.9251	18.9247
11	19.1664	18.9110	18.9117	18.9115	18.9206	18.9120	18.9123
12	19.9371	19.6491	19.6505	19.6495	19.6600	19.6502	19.6500
13	18.7550	18.4682	18.4653	18.4652	18.4730	18.4657	18.4653
14	20.9583	20.6653	20.6650	20.6646	20.6734	20.6652	20.6655
15	18.7510	18.4883	18.4910	18.4903	18.4986	18.4910	18.4909
16	19.3974	19.0749	19.0722	19.0721	19.0810	19.0725	19.0722
17	20.1165	19.8145	19.8105	19.8095	19.8165	19.8104	19.8109
18	18.8666	18.6148	18.6176	18.6172	18.6256	18.6178	18.6176
19	18.7088	18.4038	18.4017	18.4015	18.4096	18.4019	18.4018
Mean	19.7022	19.4120	19.4115	19.4111	19.4199	19.4117	19.4116

Models	V_xx	V_yy	V_zz	V_xy	V_xz	V_yz
EGM96	1.1107×10^-3	1.3167×10^-3	1.9970×10^-3	8.4266×10^-2	1.4123×10^-4	8.9367×10^-4
EGM2008	3.9667×10^-5	8.1487×10^-4	1.4673×10^-4	1.5042×10^-2	7.6374×10^-6	4.6323×10^-4
EIGEN-6C4	1.2701×10^-4	8.8093×10^-4	2.2009×10^-4	1.5169×10^-2	2.4061×10^-5	4.6335×10^-4
GGM05S	1.3360×10^-4	8.3223×10^-4	2.0746×10^-4	1.5230×10^-2	2.6495×10^-5	5.0854×10^-4
GIF48	1.2464×10^-4	9.1307×10^-4	2.3288×10^-4	1.5161×10^-2	2.4602×10^-5	4.6780×10^-4
SPW5	1.3083×10^-4	8.9930×10^-4	2.2929×10^-4	1.5134×10^-2	2.4606×10^-5	4.6925×10^-4
SGG-UGM-1	1.5633×10^-4	8.7215×10^-4	2.3634×10^-4	1.5168×10^-2	2.9129×10^-5	4.625×10^-4