Method for calibrating a measurement instrument of an optronic system

The invention relates to a method for calibrating measurement instruments of a moving optronic system occupying positions P1, P2,..., Pi,..., said optronic system comprising: a device (10) for acquiring images of a scene including a fixed object G0; means (15) for tracking the fixed object G0 during the acquisition of the images; means (20) for obtaining positions P1, P2,...; and at least one distance measuring instrument (25) and/or an instrument (30) for measuring angles of orientation and/or attitude between the measurement instrument and the fixed object G0, along a line of sight (LdV). The invention includes the following steps: acquisition of at least two images at times t1, t2,..., whereby each image is acquired from different system positions P1, P2,... and the fixed object G0 is targeted in each image, but the position thereof is unknown; acquisition of distance and/or angle measurements at times t'1, t'2,...; synchronisation of distance and/or angle measurements with positions P1, P2,... established at times t1, t2,...; and estimation of measurement errors that minimise the dispersion of at least two points of intersection Gij between the line of sight (LdV) at position Pi and the line of sight (LdV) at position Pj, as a function of said measurements and known positions, Pi, Pj, of the system.