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Three-dimensional imaging lidar system based on high speed pseudorandom modulation and photon counting

High speed pseudorandom modulation and photon counting techniques
 are applied to a three-dimensional imaging lidar system. The specific
 structure and working principle of the lidar system is described. The
 actual detector efficiency of a single-photon detector in an imaging
 system is discussed, and the result shows that a variety of reasons lead
 to the decrease in detection efficiency. A series of ranging and imaging
 experiments are conducted, and a series of high-resolution
 three-dimensional images and a distance value of 1200 m of noncooperative
 targets are acquired.