Helmet sight including a graticule image with increasing deviation with helmet displacement

摘要

A helmet sight comprises a collimator for projection of the image of a sighting graticule into the ocular field of the wearer of the helmet and sensors for measurement of the angular position of the helmet with respect to a structure, such as the cockpit of an aircraft. The collimator for projection gives the graticule a position whose angular deviation &Dgr;a, &Dgr;b with respect to a reference orientation linked to the helmet has remained an increasing function of the angular displacements of the helmet with respect to the reference structure.