Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Orbit Estimation Using a Horizon Detector in the Presence of Uncertain
  Celestial Body Rotation and Geometry   This paper presents an orbit estimation using non-simultaneous horizon
detector measurements in the presence of uncertainties in the celestial body
rotational velocity and its geometrical characteristics. The celestial body is
modelled as a tri-axial ellipsoid with a three-dimensional force field. The
non-simultaneous modelling provides the possibility to consider the time gap
between horizon measurements. An unscented Kalman filter is used to estimate
the spacecraft motion states and estimate the geometric characteristics as well
as the rotational velocity of the celestial body. A Monte-Carlo simulation is
implemented to verify the results. Simulations showed that using
non-simultaneous horizon vector measurements, the spacecraft state errors
converge to zero even in the presence of an uncertain geometry and rotational
velocity of the celestial body.

23
The categories of this paper are: solv-int
7
The categories of this paper are: hep-th
14
The categories of this paper are: math-ph
9
The categories of this paper are: nlin
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
15
The categories of this paper are: nucl-ex
17
The categories of this paper are: q-fin
19
The categories of this paper are: eess
37
The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an