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Measuring a Satellite Attitude
using Radio Signals
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What VORSat is Small Satellite
CubeSat format
10x10x10 cm 1 Kg
LEO (350 Km altitude)
Polar orbit
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CubeSats Around the World
CP-1, the first in a string of
Cal Poly Cubesats.
USU Microgravity Research Team (Utah State)
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Why?
Challenge from the Education Office of ESA
Previous collaboration in the scope of STRAPLEX
(stratospheric balloon flight program)
Project developed by students
Education oriented
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Mission
To measure the attitude from thegroundusing RF
signals
A
1
d
D
A1
A2
_ fffff
fff
(!
!
(!
032
02
01
1
A
A KHzf
GHzf
1
45,20
!(
!
321 ,, JJJPhases of the 3
frequencies as received at
GS, in cycles
P
E
PJJJJ)(
)()( 3221Dsend
!!
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Mission
To measure the attitude from thegroundusing RF
signals
A1
A2
A
1
1. Phasedifferencebetweenone pair of antennas
provides one angle of
attitude
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Mission
To measure the attitude from thegroundusing RF
signals
A3
A2
A
1
1. Phasedifferencebetweenone pair of antennas
provides one angle of
attitude
2. Other phasedifference
gives the second angle
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Mission
To measure the attitude from thegroundusing RF
signals
1. Phasedifferencebetweenone pair of antennas
provides one angle of
attitude
2. Other phasedifference
gives is the second angle
3. Thir d anglegivenby the
change of angle of sight
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Mission
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Mission
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Mission
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Mission
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Mission
Ground Station @ FEUP
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Architecture
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Re-entry
Changing thegeometry to increaseCx in
order to adjust the reentry point
Release of the reentry capsule
Communicationduring/after reentry
Splash down in the Atlantic
& recovery
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Whats new?
Combination of solar panels with antennas in order to
maximize
the exposure area and energy provided.
Patch antennas embedded in the solar cells layer during its
production.
Structure made of carbon fiber composite
Reentry of a CubeSat
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Work in progress
VORSat principle for attitude determination has been
proved viable with lab tests.
First draft of hardware requirements and layout for the
CubeSat defined.
Capsule hardware layout TBD.
Capsule release mechanism TBD.
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Facilities
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Colaborations
DEEC DEMec
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www.vorsat.org
[email protected]
I324@FEUP
