The LISA mission, the world's first space-based gravity wave detector, will consist of test masses contained in three spacecrafts flying approximately 5 million kilometres apart in a equilateral triangle formation. They will act as an interferometer and will measure the distortion of space causes by passing gravitational waves coming from massive black holes and galactic binaries. LISA Pathfinder, which will be launched in 2009, will use test masses only 30 cm apart and placed on a single spacecraft.

Alcatel Alenia Space will provide the X-band transponder, one of the key spacecraft units that will act as the unique interface between the satellite and the ground segment. It receives commands from the ground segment and transmits spacecraft telemetries, instrument information and ranging signals.

Alcatel Alenia Space will also provide the Power Specific Check-Out Equipment hardware and software, simulating the solar panels and the batteries, and is dedicated to test the spacecraft's power sub-system during assembly, integration and validation phases. Units will be delivered to EADS SPACE, the satellite prime contractor, between 2007 and end of 2008.

In the scientific instrumentation domain, Alcatel Alenia Space will develop crucial mission equipment dedicated to measuring gravitational waves, such as test masses, the caging mechanism to guarantee the safe blocking of the test masses during launch as well as the Electric Propulsion Diagnostic Package dedicated to monitoring and characterizing the environment induced by the electric propulsion on board the spacecraft.

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