本发明是一种跟踪目标尤其是跟踪导弹的装置。在此装置上由目标辐射的光束尤其红外光束通过沿光轴配置的成象光学器件在焦平面上聚成目标象点;此象点在置于焦平面的探测器平面上实现圆形章动;并由对扇形探测输出信号起响应的线路产生表示目标图象圆偏离以探测器扇面为中心的位置的电子信号。此装置只对用给定方式调制的目标辐射光束起响应; The present invention is a device for tracking targets, especially tracking missiles. In this device, a light beam, in particular an infrared light beam, radiated by a target, is converged into a target pixel on a focal plane by means of imaging optics disposed along the optical axis; this pixel implements a circular nutation on the detector plane placed in the focal plane ; And generating an electronic signal from the line responsive to the sector detection output signal indicating a deviation of the target image circle from the position centered on the detector sector. This device responds only to the target radiation beam modulated in a given way;