Design Of Phase Laser Ranging Unit

Laser ranging is a ranging method that uses a laser as the light source.Among them,phase based laser ranging technology has the characteristics of low requirements for the emission power of the light source and high measurement accuracy,and has broad application prospects in the field of medium range ranging.This paper takes this as the background and designs a dual carrier phase type laser ranging unit,which can achieve highprecision measurement for distances less than about 1km.This article first provides a scheme design for the ranging unit,divides the specific functional modules,and analyzes the principle of dual carrier ranging.On the basis of determining the overall unit plan,hardware design was carried out,including device selection,circuit design of hardware modules,and layout and wiring design of PCB circuit boards.Experimental verification of the functions of each module was completed on the circuit board.Subsequently,the paper designed software for the ranging unit,achieving functions such as sine wave signal transmitter configuration,laser current control,signal phase decoding,and thread management.Finally,the paper conducted simulation analysis on the performance of the ranging unit and studied the impact of the working conditions of avalanche photodiodes on the accuracy of laser ranging.When the bias voltage changes,there is an optimal bias voltage that can maximize the system signal-to-noise ratio and minimize the ranging error.When the input optical power received by the receiver is different,the optimal bias voltage remains basically unchanged.According to the reported spatial attenuation parameters,the estimation shows that the ranging error of the ranging unit can be less than 12mm when transmitting a power of 100mW and ranging a distance of lkm,achieving highprecision ranging requirements.