Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Global Gravity Field Model from Taiji-1 Observations   Taiji-1 is the first technology demonstration satellite of the Taiji program
of China's space-borne gravitational wave antenna. After the demonstration of
the key individual technologies, Taiji-1 continues collecting the data of the
precision orbit determinations, the satellite attitudes, and the
non-conservative forces exerted on the S/C. Therefore, during its free-fall,
Taiji-1 can be viewed as operating in the high-low satellite-to-satellite
tracking mode of a gravity recovery mission. In this work, one month data from
Taiji-1's observations have been selected and the techniques are developed to
resolve the long term interruptions and disturbances in the measurement data
due to the scheduled technology demonstration experiments. The first global
gravity model TJGM-r1911, that independently derived from China's own satellite
mission, is successfully built from Taiji-1's observations. Compared with
gravity models from CHAMP and other satellite gravity missions, accuracy
discrepancies exist, which is mainly caused by the data discontinuity problem.
As the approved extended free-falling phase with minimal disruptions and
disturbances, Taiji-1 will serve as the first satellite gravity mission for
China since 2022 and will provide us the independent measurement of both the
static and the monthly time-variable global gravity field.

11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ
7
The categories of this paper are: hep-th
4
The categories of this paper are: cond-mat
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
14
The categories of this paper are: math-ph
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn