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GR: Fachverband Gravitation und Relativitätstheorie

GR 13: Relativity and Data Analysis

GR 13.4: Talk

Thursday, March 23, 2023, 17:00–17:20, ZEU/0260

Ranging and Clock Synchronization in LISA Data Processing — •Jan Niklas Reinhardt — Albert Einstein Institut, Hannover

The Laser Interferometer Space Antenna (LISA) is an ESA-led mission for gravitaional wave detection in space aiming for the frequency band between 1 mHz and 1 Hz after its launch in 2035. In order to extract the gravitational wave signals from the LISA data, various instrumental noise sources must be suppressed. The dominating noise source is by far the laser frequency noise, which must be reduced by more than 8 orders of magnitude to meet the LISA requirement of 1 pm. This can be achieved by time delay interferometry (TDI), which combines the various data streams with the correct delays to virtually form equal arm Michelson interferometers, in which laser frequency noise naturally cancels. This algorithm, as its name fortells, relies on knowledge about the delays (corresponding to the inter spacecraft distances), its classical execution additionally requires nano second synchronization of the three LISA timers. The estimation of the delays and the clock synchronization are the topic of this presentation.