Removal of interference from external coherent signals

TL;DR

This paper introduces a coherent line removal technique to eliminate external interference from gravitational wave data, improving detector sensitivity and reducing non-Gaussian noise.

Contribution

The paper presents a novel method called coherent line removal for effectively removing external coherent interference from gravitational wave interferometer data.

Findings

Successfully removed interference at electricity supply frequencies

Reduced non-Gaussian noise levels in the data

Potentially increased detector sensitivity and duty cycle

Abstract

We present a technique that we call coherent line removal, for removing external coherent interference from gravitational wave interferometer data. We illustrate the usefulness of this technique applying it to the the data produced by the Glasgow laser interferometer in 1996 and removing all those lines corresponding to the electricity supply frequency and its harmonics. We also find that this method seems to reduce the level of non-Gaussian noise present in the interferometer and therefore, it can raise the sensitivity and duty cycle of the detectors.