Laser echo distance measuring method and distance measuring device

Abstract

The invention provides a laser echo distance measuring method and a distance measuring device. The distance measuring device comprises a laser transmitting module, a control module, a time measuring module, an echo receiving module, a multi-channel triggering module, and an echo distance measuring module. There is no need to increase a peak power of a transmitted laser, and no need to increase anaperture of a receiving lens or use a constant ratio discriminator in the laser echo distance measuring method and distance measuring device. The invention completes a fast discriminating between a dark counting noise and a real echo signal through a multi-channel high-speed comparator method, and simultaneously performs time stamp measurement on an echo pulse electric signal through multiple channels, which accurately measures distance of a current pulse, and also effectively reduces an overall power consumption of the device. Moreover, the device can be effectively applied to occasions withhigh real-time and scanning rate requirements, and improves an applicability of the laser radar echo distance measuring method and the distance measuring device according to the invention. The invention reduces measurement cost and also guarantees safety of the surveyor.

Description

technical field [0001] The invention relates to the technical field of laser radar ranging, in particular to a laser echo ranging method and a ranging device. Background technique [0002] An active detection method based on laser radar in the prior art, its basic working principle is to emit laser light to the target to be detected through the laser radar, and the laser light is irradiated on the target to be detected and reflected on the surface of the target to be detected, and then received by the receiver The laser signal reflected by the target to be measured, the distance between the laser radar and the target to be measured is obtained after measuring the round-trip time of the laser signal. Due to the high coherence, directionality and monochromaticity of laser itself, the active detection method of laser radar can realize the function of long-distance and high-precision ranging, and it is widely used in automatic driving and three-dimensional modeling of buildings....

AI Technical Summary

Problems solved by technology

However, increasing the aperture of the receiving lens will inevitably increase the overall quality of the equipment on the one hand, and more importantly, increasing the receiving lens will also inevitably increase the background light entering the receiving field of view, which will reduce the signal-to-noise ratio of the system

[0007] In view of the above technical problems, in order to compensate for the performance deterioration in the prior art, a constant ratio discriminator is proposed. The constant ratio discriminator uses a dedicated pulse edge extraction circuit, but the constant ratio discriminator needs to set extremely strict requirements on its parameters. In order to ensure its normal operation, the requirements for the operators of the measurement team using this equipment have been further increased, and the difficulty of measurement has been increased due to the cumbersome setting process

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