VEGA Small Launcher
Fourth Stage: AVUM
(Attitude and Vernier Module)
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The AVUM performs the following functions:
• roll control during second, third and fourth stage flights
• attitude control during coasting phase
• correction of axial velocity error due to solid rocket motor
performance scatter
• generation of the required velocity change for orbit circularisation
• satellite pointing
• payload(s) release manoeuvres
The AVUM propulsion module is composed of a UDMH/NTO bipropellant main engine with a re-ignition capability and a cold gas attitude control system, based on two clusters of three thrusters, each having a 50 N thrust.
The AVUM avionics module will provide the following services:
• flight control and mission management
• telemetry
• localisation and neutralisation
• power supply and distribution