Target tracking device comprising a photodetector with quadrants

摘要

Device for tracking a target, the device comprising an optical system and a quadrant photodetector, wherein the optical system is configured to project a light beam coming from the target at one spot on at least one of the quadrants, and the photodetector is configured to estimate a current position of the spot by weighting of light energies received by the quadrants. The optical system comprises an optical device configured, when the spot is entirely contained in only one of the quadrants, to enlarge the spot. The invention also relates to a tracking method likely to be implemented by this tracking device.