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Abstract

LISA is a space-based mHz gravitational-wave observatory, with a planned
launch in 2034. It is expected to be the first detector of its kind, and will
present unique challenges in instrumentation and data analysis. An accurate
pre-flight simulation of LISA data is a vital part of the development of both
the instrument and the analysis methods. The simulation must include a detailed
model of the full measurement and analysis chain, capturing the main features
that affect the instrument performance and processing algorithms. Here, we
propose a new model that includes, for the first time, proper relativistic
treatment of reference frames with realistic orbits; a model for onboard clocks
and clock synchronization measurements; proper modeling of total laser
frequencies, including laser locking, frequency planning and Doppler shifts;
better treatment of onboard processing and updated noise models. We then
introduce two implementations of this model, LISANode and LISA Instrument. We
demonstrate that TDI processing successfully recovers gravitational-wave
signals from the significantly more realistic and complex simulated data.
LISANode and LISA Instrument are already widely used by the LISA community and,
for example, currently provide the mock data for the LISA Data Challenges.