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We present a fully active-controlled He-Ne ring laser gyroscope, operating insquare cavity 1.35 m in side. The apparatus is designed to provide a very lowmechanical and thermal drift of the ring cavity geometry and is conceived to beoperative in two different orientations of the laser plane, in order to detectrotations around the vertical or the horizontal direction. Since June 2010 thesystem is active inside the Virgo interferometer central area with the aim ofperforming high sensitivity measurements of environmental rotational noise. Sofar, continuous not attempted operation of the gyroscope has been longer than30 days. The main characteristics of the laser, the active remote-controlledstabilization systems and the data acquisition techniques are presented. Anoff-line data processing, supported by a simple model of the sensor, is shownto improve the effective long term stability. A rotational sensitivity at thelevel of ten nanoradiants per squareroot of Hz below 1 Hz, very close to therequired specification for the improvement of the Virgo suspension controlsystem, is demonstrated for the configuration where the laser plane ishorizontal.

A 1.82 m^2 ring laser gyroscope for nano-rotational motion sensing