In order to measure the coordinate of moving target, the laser tracking system for moving target was proposed, in which the receiver of four-quadrant APD was adopted as the detector and the DC motor was used to drive the reflector to move in two dimensions. The principle of the measurement system was analyzed first. Then the main part of the system was introduced. The tracking experiment showed that, this system could realized the function of automatic tracking and measuring the coordinate of moving target according to the pulsed laser ranging and angle sensors.
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