IEEE - Aerospace and Electronic Systems - August 2022 - 16

Maximization of LEO Nanosatellite's Transmission Capacity to Multiple Ground Stations
Figure 15.
GS elevation and azimuth rate for SET 3 (RAAN = 198.6 and AOP = 161.4) orbit. In the graph is displayed one day ofsimulation for clarity.
and the following angular combination was considered to
determine the optimal orbit: RAAN = 12.4
and AOP =
111.7. Figure 11 shows the corresponding number of contacts.
Table 6 summarizes the corresponding results.
Figure 13 represents the skyplot centered on the
ground telescope placed in Dome-C station considering
the optimal orbit previously analyzed. This graph reports
the S/C longitude (angle in the plane) and elevation (distance
from the center of the plot) during the passage of the
satellite above the site. The center of the plot represents a
point in the zenith direction, whereas the outermost circumference
represents points on the horizon.
Similar graphs are obtainable also for other sites.
Results show that, as expected, the S/C is visible from
every ground telescope only when its elevation is greater
than 20 and that sites are closer to the Earth's equator
(Atacama, White Mountain, and Tenerife) are the ones
less frequently visited by the satellite.
RESULTS OF REQUIRED ATTITUDE CONTROL AND
EFFECTIVE CONTACT DURATION
The satellite's attitude simulation is performed using the
orbital parameters of higher orbits (see Table 2). Figure 14
16
(a) shows the magnification over an orbital period of roll,
pitch, and yaw angles of the S/C body relative to the ECI
frame retrieved from the target satellite's attitude quaternion
and the transition maneuver from nadir pointing to
ground telescope pointing [see (5)]. Figure 14(b) shows
Table 7.
Pointing Maneuver Maximal Input Body Frame's Angular
Velocity
SET 3 (RAAN
= 198.6 and
AOP=161.4)
Max. angular
rate
fvx; vy; vzg
(/s)
Required
momentum
storage
fhx;hy;hzg
(mNms)
IEEE A&E SYSTEMS MAGAZINE
(0.36, 0.72,
0.17)
(0.36, 1.00,
0.09)
SET 3 (RAAN
= 12.4 and
AOP = 111.7)
(0.75, 0.72,
0.29)
(0.74, 1.00,
0.16)
AUGUST 2022

IEEE - Aerospace and Electronic Systems - August 2022

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