Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An Adaptive Groundtrack Maintenance Scheme for Spacecraft with Electric
  Propulsion   In this paper, the repeat-groundtrack orbit maintenance problem is addressed
for spacecraft driven by electric propulsion. An adaptive solution is proposed,
which combines an hysteresis controller and a recursive least squares filter.
The controller provides a pulse-width modulated command to the thruster, in
compliance with the peculiarities of the electric propulsion technology. The
filter takes care of estimating a set of environmental disturbance parameters,
from inertial position and velocity measurements. The resulting control scheme
is able to compensate for the groundtrack drift due to atmospheric drag, in a
fully autonomous manner. A numerical study of a low Earth orbit mission
confirms the effectiveness of the proposed method.

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The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
13
The categories of this paper are: quant-ph
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The categories of this paper are: chem-ph
12
The categories of this paper are: nucl-th
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org