A new approach to minimize walk error in pulsed laser rangefinding

In this paper a new way of timing discrimination to measure the timing point of echo signal in pulsed laser rangefinder is presented. This method is an improvement program of high-pass filter scheme. With multiple differential processing of pulsed laser echo signal through high-pass filter circuit, the timing point of laser echo signal will multiple forward approximately. The final identification time and the echo signal which rise along the time interval of initial point will be reduced to the minimum degree, and improve the overall accuracy of the results for a pulsed laser rangefinder, which will eventually minimize walk error between the timing point of the echo signal with the actual beginning timing point of the echo signal and improve precision of the results overall pulse laser radar rangefinding. In addition, the laser echo signal with a small distortion can be still measured and obtained the starting point of the leading edge. Finally, the experimental results show that the proposed new method can reduce the walk error caused by the time delay of the echo pulse timing discrimination, and can also deal with the distorted signal effectively.