The device comprises: a laser, a first/second spectroscope, a polarization beam-splitter piece, a 1/4 wave plate, a telescope, a full-reflection mirror on reflection beam of the first spectroscope, a switch, and an optical Doppler imaging detector on the output light direction of second spectroscope. Wherein, arranging the first spectroscope and beam-splitter piece both as 45Deg, 1/4 wave plate and telescope on the OA of output beam of the laser in turn; arranging with 45Deg the second spectroscope on the cross point of switch light path and reflection light path of laser echo of beam-slitter piece. This invention can determine the position, height, velocity and direction. |