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Space: Science & Technology
/
2021
/
Article
/
Tab 1
Review Article
Development and Prospect of Chinese Lunar Relay Communication Satellite
Table 1
Major technical performance parameters of Queqiao relay satellite.
Item
Major parameters
Orbit
Halo orbit around EML2 with Z-amplitude of 13000 km
Platform
CAST 100 small satellite platform
Mass/kg
448.7
Size/mm
3
(satellite body)
Attitude control
Three-axis stabilized zero-momentum control
Pointing control accuracy: better than 0.06°
Pointing stability: better than 0.005°/s
Propulsion
Hydrazine propulsion system with two 70 L tanks
Four 20 N thrusters and twelve 5 N thrusters
Carrying 105 kg propellant can provide more than 550 m/s
Δ
v
Power
Output power of solar array: >780 W
Capacity of the storage battery: >45 ah
TT&C
USB + VLBI
Date rate: 1000 bits/s (uplink)/2048 bits/s (downlink)
Relay communications
Four links between Queqiao and rover/lander (X band), one link between satellite and earth (S band, X band as backup)
A 4.2 m diameter parabolic antenna is used for communication with the rover and the lander
A spiral antenna is used for S band data transmission
Data rate:125 bits/s (from Queqiao to rover/lander)
1.4/50/280/555 kbits/s (from lander to Queqiao)
0.7/140/285 kbits/s (from rover to Queqiao)
1/2/4/10 Mbits/s (from Queqiao to earth stations, S band or X band)
Lifetime
More than 3 years