Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Controllability Analysis of Motion of Artificial Satellite Under the
  Effect of Oblateness of the Earth   In this article we have studied the controllability of artificial satellite
under the effect of zonal harmonic $J_2$ in cylindrical polar coordinates
systems. Seven different cases of thrusters in various directions have been
analyzed and it is found that the system is controllable if we apply thrusters
in either $r$, $\theta$ and $z$ or $\theta$ and $z$ direction. The equations
governing motion of satellite have been linearized and Kalman controllability
test is applied to check the controllability of the system. We have also
derived controller $u$ for the linearized system. The trajectory of the system
have been plotted to show the controllability of the system.

37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
26
The categories of this paper are: bayes-an
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
12
The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat
18
The categories of this paper are: econ
8
The categories of this paper are: hep-ex
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph