Distributed high-precision laser online measurement system

The invention provides a distributed high-precision laser online measurement system. A main/backup laser device acts as an emitting light source. Emitting laser is divided into multipath emitting light beams through an optical beam combiner, an optical circulator and an optical beam splitter. The number of split light paths of the emitting light beams is further increased by an optical switch array, and the optical switches can perform time sequence switching on emergent light paths through the control of the system. Each path of emergent laser is corresponding to one optical transmit-receive antenna so as to be corresponding to one cooperative target body. Laser returned by the cooperative target returns to the optical circulator through the light paths and enters a photoelectric detector. Echo phase calculation is performed by a signal processing system after photoelectric conversion of the photoelectric detector so that accurate distance information of a target dot matrix can be obtained. In-orbit real-tim