Phase type laser distance measuring system

Abstract

The invention discloses a phase type laser distance measuring system. The system comprises a laser for generating laser signals; an emission signal unit for generating emission signals and sending the emission signals to the laser after amplitude adjustment and power amplification are successively performed on the emission signals; a returning light receiving unit for receiving reflection signals of laser signals; a bias driving unit for providing offset voltages for driving the laser to emit the laser signals; and a controller for outputting PWM pulse voltage signals with an adjustable duty ratio to the bias driving unit to form the offset voltages and receive the emission signals. When the controller receives that the emission signals involves weak reflection, the controller reduces the duty ratio of the PWM pulse voltage signals and improves the amplitude of the emission signals in a linkage mode; and when the controller receives that the emission signals involves strong reflection, the controller increases the duty ratio of the PWM pulse voltage signals and reduces the amplitude of the emission signals in a linkage mode. The system provided by the invention has the advantages of simple system, high anti-interference capability and high distance measuring accuracy.

Description

technical field [0001] The invention relates to the field of laser ranging, and more specifically, the invention relates to a phase type laser ranging system. Background technique [0002] Laser distance measurement uses a laser as a light source for distance measurement. Due to the characteristics of good monochromaticity and strong directionality of the laser, coupled with the integration of electronic circuits and semiconductors, compared with photoelectric rangefinders, it can not only work day and night, but also improve the distance measurement accuracy and significantly reduce weight and power consumption. [0003] At present, laser ranging can be divided into pulse laser ranging and phase laser ranging. Pulse laser ranging, the laser emitted by the rangefinder is reflected by the object to be measured and then received by the rangefinder. The rangefinder records the round-trip time of the laser at the same time, and half of the product of the speed of light and the ...

AI Technical Summary

Problems solved by technology

[0004] The traditional phase laser range finder generally has a measurement range of several centimeters to hundreds of meters, and the dynamic range is extremely large. It requires a higher-resolution analog / digital converter or a gain control in the front-end circuit, and in weak target occasions, Weak transmit signals are often submerged in noise, difficult to extract, and the system has poor anti-interference ability

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