ESA Document - Emits - ESA

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HMM
Assessment Study
Report: CDF-20(A)
February 2004
page 251 of 422
handling devices in the outside part of the SHM. Further analysis on the planetary
protection issues needs to be done.
• Power requirements lead to big solar panels, complex to deploy. Fuel cells are envisaged
• Direct link with the ground station on Earth is only available during 50 % of the time,
and only during 12 % with the TV, therefore a communications relay satellite is required
4.1.3 Mass budget
The mass budget is shown in Table 4-2.
Total Mass with Margin
Mars Excursion Vehicle (kg)
46437
Descent Surface Habitation
Module (kg) Module (kg)
Mars Ascent
Vehicle (kg)
Total Mass with Margin 4905 19188 22344
Total Dry Mass with Margin 3443 15846 6410
System Margin Applied 574 2641 1068
Structure 0 2769 863
Thermal Control 1722 612 524
Mechanisms 68 1351 791
DLS 620 0 0
Communications 2 25 19
Data Handling 0 37 21
GNC 204 0 158
Propulsion 254 1338 1168
Power 0 2448 91
Harness 0 1000 180
Lifesupport (Dry) 0 3515 658
Consumables
Dry Food 0 76 11
Drinking Water 0 0 51
Hygiene Water 0 0 18
Oxygen 0 0 13
Packaging 0 27 5
Inorganic 0 11 2
Payload 0 110 584
Astronauts 0 0 285
Total Propellant Mass 1463 3227 15834
4.2 Configuration
Table 4-2: Mass budget for the MEV
The Mars Excursion Vehicle (MEV) is attached to the TV and is the mission element to land on
the surface of Mars and takes off after 30 days to rendezvous and dock with the TV.
4.2.1 Requirements and design drivers
• The Mars Excursion Vehicle (MEV) is composed of a Descent Module (DM), a Surface
Habitation Module (SHM) and the Mars Ascent Vehicle (MAV)
• The MEV shall provide space for three astronauts