Pulse-type laser range finding method

Abstract

The invention discloses a pulse-type laser range finding method, comprising: S1, a controller outputting emission driving signals with time intervals T to drive a laser to emit a laser pulse sequence with (M-1) time intervals T; S2, a return light receiving device receiving reflected pulses, and a time chip recording the flight time Tf of each laser pulse from emission to receiving, and a receiving absolute time Ta, wherein the flight time Tf is much less than the time intervals T; S3, determining whether each received reflected pulse is an effective reflected pulse, storing the flight time Tf and receiving absolute time Ta of the reflected pulse in a controller if the received reflected pulse is effective, and continuing receiving a next reflected pulse if the received reflected pulse is ineffective; and S4, based on the flight time Tf of effective reflected pulses, setting a light velocity to be C, and calculating a distance D to be measured, wherein D=(C*Tf) / 2. The pulse-type laser range finding method has the advantages of weak reflection, high accuracy of long distance laser range finding, and strong anti-interference capability.

Description

technical field [0001] The invention relates to the field of laser ranging, and more specifically, the invention relates to a pulsed laser ranging method. 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 roun...

AI Technical Summary

Problems solved by technology

However, increasing the judgment threshold of time measurement will lose a lot of useful signals, thus losing the range

In addition, in the case of long-distance or weakly reflecting target pairs, the return signal is extremely weak. In order to avoid misjudgment, this type of method can only reduce the judgment threshold, which will inevitably introduce some noise and affect the accuracy of laser ranging.

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