Calibration method and device

Abstract

The invention provides a calibration method and device, and relates to the field of laser ranging. The calibration method comprises the steps of selecting a plurality of sampling points within a preset calibration range, and acquiring the actual distance between each sampling point and an observation point; acquiring a fitting distance polynomial corresponding to each sampling point through polynomial fitting, and acquiring the fitting distance corresponding to each sampling point based on the fitting distance polynomial; and acquiring the variance between the fitting distance corresponding toeach sampling point and the actual distance; and screening out the fitting distance polynomial corresponding to the minimum variance to serve as the optimal fitting distance polynomial. According tothe method and device provided by the invention, a plurality of fitting polynomials which are approximate to the actual value are created through polynomial fitting, then the most accurate function isscreened out through comparing the variance, targeted calibration can be provided for ranging radar with different performance parameters, the operation is convenient, the result is reliable, and themeasurement accuracy of laser triangulation ranging can be effectively improved.

Description

technical field [0001] The invention relates to the field of laser ranging, in particular to a calibration method and device. Background technique [0002] Laser Distance Measuring (Laser Distance Measuring) uses a laser as a light source for distance measurement. The laser rangefinder is an instrument that uses laser to accurately measure the distance of the target. According to the way the laser works, it is divided into continuous laser and pulsed laser. Gas lasers such as helium-neon, argon ions, and krypton-cadmium work in a continuous output state and are used for phase laser ranging; double heterogeneous gallium arsenide semiconductor lasers are used for infrared ranging; solid-state lasers such as ruby ​​and neodymium glass are used for Pulsed laser ranging. Compared with the photoelectric range finder, the laser range finder can not only work day and night, but also improve the distance measurement accuracy and significantly reduce the weight and power consumpti...

AI Technical Summary

Problems solved by technology

[0004] However, in the laser triangulation ranging method, although the change in the distance is approximately proportional to the change in the displacement of the laser spot on the CMOS, the displacement is easily affected by the external environment and the performance of the optical system, material, and components. The error is relatively large, and there is inconsistency in the error of each ranging machine, so it is necessary to calibrate the laser radar used

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