Method for improving pulse ranging precision and pulse ranging equipment

Abstract

The invention discloses a method for improving pulse ranging precision. The method is characterized by comprising the following steps of a, transmitting a laser pulse and simultaneously starting timing; b, respectively recording time t1 between laser signal transmission and an echo wave rising edge signal and time t2 between laser signal transmission and an echo falling edge signa; c, obtaining an initial measurement distance x=(t1*V) / 2, echo signal pulse width y=(t2-t1)*v, wherein v represents light velocity and unit is m / s; and d, through a Levenberg-Marquardt method, by means of the initial measurement distance x and the echo pulse width y, obtaining a functional relation of a final measurement distance z through fitting based on a nonlinear curve of matrix data: z=p1+p2*x+p3*x^2+p4*x^3+p5*x^4+p6*x^5+p7*Ln(y)+p8*(Ln(y))^2+p9*(Ln(y))^3+p10*(Ln(y))+p11*(Ln(y))^5), wherein the unit of z is m, P1 to P11 are constants, and an average value is calculated from a plurality of detection results. The invention further discloses pulse ranging equipment applied to the method. The method and the pulse ranging equipment have advantages of high detection precision and large measurable distance range.

Description

technical field [0001] The invention relates to the optical instrument manufacturing industry, in particular to a method for improving the accuracy of pulse ranging and pulse ranging equipment. Background technique [0002] The measurement accuracy of pulsed laser ranging mainly depends on the rising edge of the laser pulse, the bandwidth of the receiving channel, the signal-to-noise ratio of the detector and the accuracy of time interval measurement. The accuracy of the distance is mainly considered from the laser flight time t. The most critical technology is how to accurately determine the start and end moments of t and the precise measurement time interval. They use the time identification method and the time interval method respectively. [0003] For the time interval method, there is a large error in determining the start and end time of t and the precise measurement time interval, and the detection accuracy needs to be improved. If you buy high-precision detection equ...

AI Technical Summary

Problems solved by technology

However, this detection method still has some disadvantages, mainly reflected in: 1. The circuit is complex and the cost is high; 2. The ability to withstand noise is poor

Images