Inter satellite laser interferometry is a central component of future space-borne gravity instruments like LISA, eLISA, NGO and future geodesy missions. The inherently small laser wavelength allows to measure distance variations with extremely high precision by interfering a reference beam with a measurement beam. The readout of such interferometers is often based on tracking phasemeters, able to measure the phase of an incoming beatnote with high precision over a wide range of frequencies. The implementation of such phasemeters is based on all digital phase-locked loops, hosted in FPGAs. Here we present a precise model of an all digital phase locked loop that allows to design such a readout algorithm and we support our analysis by numerical performance measurements and experiments with analog signals.
@article{arxiv.1310.2486,
title = {Phasemeter core for intersatellite laser heterodyne interferometry: modelling, simulations and experiments},
author = {Oliver Gerberding and Benjamin Sheard and Iouri Bykov and Joachim Kullmann and Juan Jose Esteban Delgado and Karsten Danzmann and Gerhard Heinzel},
journal= {arXiv preprint arXiv:1310.2486},
year = {2016}
}
Comments
17 pages, 6 figures, accepted for publication in CQG