Application of Pseudo-Random Sequence in Lidar Ranging

A way of laser ranging was proposed based on autocorrelation property of pseudo-random sequence. The hardware platform of laser ranging was designed and the plan of echo-signal´s recognition was given in which the bit width and the period of pseudo-random sequence were detected. The delaying time of the echo signal was also determined according to the auto-correlation properties of pseudo-random sequence. The influences of the coherent accumulation gain and the error bits of the echo signal on the accuracy of laser ranging were analyzed later. The simulation results show that the coherent accumulation gain can improve the signal to noise rate (SNR) and error bits must be less than 13 in 31-bit pseudo-random sequence.