Pulsed laser ranging time-interval measuring technique

In pulsed laser ranging system, the time interval measurement to improve the accuracy of the interpolation method for time interval measurement. This article analyzes the traditional digital counting method based on the principle and error, focusing on the interpolation. The objects of measurement are the conventional digital counting pulse under test and the next rising edge of a quantitative clock time interval between pulse rising edge. By capacitive discharge technology, the time interval is loaded to a time extension module (usually a high-precision capacitance) to achieve time amplification. Measurement of the enlarged time can improve the precision of time measurement. Using this method, the time interval measurement accuracy is up to 100 ps, corresponding to 1.5 cm range accuracy.