Civil Engineering Reference
In-Depth Information
G
Telemetry module
Battery cell module
Magnetometer
Interface unit Mx
Interface unit My
Power conditioning
unit
X
Cells leveling unit
On-board digital
computing complex
"3 modules"
Gyro My
S-band electronic module
"2 modules"
GPS electronic module
MEI signal processing
unit "2 units"
Z
Fig. 2.20 General layout of Small Sat in the opposite side of Y-direction without solar panels or
heat shields
2.7.6 Coordinate System
The following rectangular right-hand coordinates are applied.
• Design coordinate system ''O
d
X
d
Y
d
Z
d
''
Origin of coordinates is in LV/satellite interface plane on the center lines of the
launch vehicle and satellite; it coincides with the geometrical center of the base plate.
O
d
Z
d
axis is perpendicular to the LV/satellite interface plane with +Z toward the nose
of the fairing that corresponds to nadir on orbit. O
d
X
d
axis lies in the interface plane
and is pointed to direction of flight. O
d
Y
d
axis lies in the interface plane and
supplements the design coordinate system to make it a right-hand one (Fig.
2.22
).
• Orbital coordinate system ''O X
o
Y
o
Z
o
''
Origin of coordinates O coincides with the satellite's center of mass. OZ
o
is
directed along a radius vector which joins the satellite's center of mass and the
Earth's center, where +Z in nadir direction. OX
o
lies in the satellite's orbital plane
and is orbital motion-directed. OY
o
supplements the orbital coordinates to make
them a right-hand system (Fig.
2.22
).
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