Star Recognition Approach

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Star Recognition Approach
Real CCD-camera picture of the starry sky
obtained from the Swedish Astrid-2 satellite.
White bright segment is the Earth. Light strips
are created by stars due to the angular motion of
the satellite. Others light points are generated
by noisy.
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Simulation of the Star Recognition Algorithm
Simulation of the star recognition algorithm.
Blue rectangular represents the field of view of
on-board CCD-camera. The same is shown in the
upper-left picture. Recognized stars with their
numbers within the Star Catalog are shown in the
upper-right picture. The straight line links two
mutually outermost stars. Transformation matrix D
is calculated (right-side formula) via unit
vectors of the two stars which are taken from the
Catalog and calculated through measured data.
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MUNIN Nanosatellite Engineering Model
4
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5
Attitude Control System

• Content of ACS
• Permanent magnet
• 8 hysteresis rods
• Content of AD
• 4 photodiods
• horizon sensor

6
Nanosatellite TNS-0
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Attitude Motion Analysis

• Acquisition motion
• (initial angular velocity is 3 degrs/sec)
• Steady-state motion

8
TNS-0 N 1 Launch Campaign (ISS, 28th of March,
2005)
9
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11
Gravity-gradient ACS with magnetic torquers

• Pakistanean BADR-B experimental satellite
  (launched on 10th December, 2001 with Meteor-3M)
• 50 kg mass
• Sun-synchronous orbit (1050 km altitude and 98
  degrees inclination)
• 3-5 degree accuracy required

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Algorithm of preliminary orientation along vector
B
Angle between axis Oz and vector B (unit
degrees) vs number of revolutions around the
Earth. Librations in the vicinity of tumbled
equilibrium position with angle of 180 degrees
correspond to required preliminary orientation of
the satellite
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Active damping of disturbed motion

• The Jacobis integral V for circular orbit is
  used as a measure of deviation of the satellite
  from required equilibrium
• Derivative of V is governed by control torque

14
Control strategy

• If ?(m,wrel?H) ?lt? then m0
• else

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Usage of the algorithm of magnetic orientation to
provide a gravity-gradient orientation
MACS is activated
S
N
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• ???? 97-01-00910
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• Landau Network-Centro Volta (Italy)
• DAAD (Germany)
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• Space Innovation Ltd (UK)
• Institute of Space Physics (Sweden)
• ZARM (Bremen, Germany)
• University Federico II (Napoli, Italy)

20
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21
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