Method of High Precision Interval Measurement in Pulse Laser Ranging System

Laser ranging is suitable for laser system, for it has the advantage of high measuring precision, fast measuring speed, no cooperative targets and strong resistance to electromagnetic interference, the measuremen of laser ranging is the key paremeters affecting the performance of the whole system. The precision of the pulsed laser ranging system was decided by the precision of the time interval measurement, the principle structure of laser ranging system was introduced, and a method of high precision time interval measurement in pulse laser ranging system was established in this paper. Based on the analysis of the factors which affected the precision of range measure, the pulse rising edges discriminator was adopted to produce timing mark for the start-stop time discrimination, and the TDC-GP2 high precision interval measurement system based on TMS320F2812 DSP was designed to improve the measurement precision. Experimental results indicate that the time interval measurement method in this paper can obtain higher range accuracy. Compared with the traditional time interval measurement system, the method simplifies the system design and reduce the influence of bad weather conditions, furthermore, it satisfies the requirements of low costs and miniaturization.