ESA Document - Emits - ESA

s
HMM
Assessment Study
Report: CDF-20(A)
February 2004
page 377 of 422
Element 3: Mars Ascent Vehicle MASS [kg]
Unit Element 3 Unit Name
Quantity Mass per Maturity Level Margin Total Mass
Click on button below to insert new unit
quantity excl.
margin
incl. margin
1 IMU 2 2.500 Fully developed 5 5.3
2 Altimeter 1 1.000 Fully developed 5 1.1
3 LIDAR 1 4.000 To be developed 20 4.8
4 Camera 1 3.500 To be modified 10 3.9
5 Display 1 0.200 To be developed 20 0.2
6 Hand controls and buttons 2 0.800 To be developed 20 1.9
7 Electromecanic equipment 3 3.000 To be developed 20 10.8
8 Rendez-vous joysticks 4 0.200 To be developed 20 1.0
9 Rendez-vous TV 1 2.500 To be modified 10 2.8
10 Rendez-vous Radio Frecuency System 1 4.000 To be modified 10 4.4
11 Rendez-vous Camera 1 2.500 To be modified 10 2.8
12 Rendez-vous LIDAR 1 4.000 To be developed 20 4.8
- Click on button below to insert new unit
To be developed 20 0.0
ELEMENT 3 SUBSYSTEM TOTAL
12 38.1 14.4 43.6
Table 4-54: GNC equipment: mass budget
Figure 4-112 shows the RvD budget in terms of time and fuel consumption.
Delta V budget (m/s)
60
50
40
30
20
10
Impulsive Hohmann Transfer
Applied Delta V
Station Keeping
Forced Motion
Station Keeping
Forced Motion
Free Drift
Delta V budget
0
0 1000 2000 3000 4000 5000 6000 7000 8000 9000
Time (s)
4.5.2.6.1 Manual rendezvous backup system
Figure 4-112: RvD budgets: time and fuel
This manual system is based on the one that is on-board the Soyuz. The astronaut controls the
vehicle by manually translating and rotating around its centre of gravity. In order to do this the
astronaut needs to perform a loop with these steps.