在高速伪随机码调制和光子计数技术的激光测距系统中，采用不同的伪随机码，在光纤延时的方法下开展了基于不同伪随机码调制的测距实验并与M序列伪随机码进行对比。结果表明在相同的入射条件下，M序列伪随机码具有更好的信噪比和测距精度。搭建了实际测距平台并开展了室外测距实验，在10阶M序列伪随机码，1 GHz调制速率，发射光输出峰值功率12.1 W，测量768.5 m远的目标时，得到3.2 cm的测距精度。

Different pseudorandom codes are adapted in laser ranging system based on high modulation rate and photon counting technology. Ranging performance is compared and demonstrated between different pseudorandom codes and M sequence using fiber delay method of ranging experiments. Under the same incident condition, better signal of noise ratio and ranging accuracy are acquired when using M sequence. The actual ranging platform is established and ranging experiment outdoor is carried out. Ranging accuracy of 3.2 cm is obtained when the laser transmit to a target which distance is about 768.5 m under the condition of the transmitter peak power of 12.1 W, 10 order M pseudorandom sequence and 1 GHz modulation rate.