Detector for position of pilot's helmet - uses opto-electronic system giving line of sight for arming system

摘要

A semi-active opto-electric detector system is used to ensure that the angular position of the pilot's helmet in a combat aircraft is known. This is necessary in order to determine the pilot's line of sight for an arming system. The line of sight (DV) of a pilot is determined from reflecting point elements (M1, 2, 3) on the helmet (SM). A generator (12) produces 3 different modulating signals for optical modulators in the reflecting elements. The modulated signals pass via an optical system to a photodetector (7) behind a plane matrix (6). The signals are preamplified (15) prior to demodulation (16) where the binary coded modulating signals are recovered. The signals are then amplified (17) prior to input to a calculator circuit (20). This determines the spatial position of the reflecting points and consequently the pilots line of sight.