Expressway sight distance detection method based on laser radar

Abstract

The invention discloses an expressway sight distance detection method based on laser radar. The expressway sight distance detection method based on the laser radar comprises the following steps that firstly, a road safety sight distance threshold value L<s> is set; parameters of the laser radar to be used are set; then, the laser radar to be used is mounted at the top of a detection vehicle at a height h<0> from the ground, so that the scanning range of the laser radar meets the following requirements that L<max>= h<0>. tan alpha <max>> l<s>; then, the position of the laser radar is taken as the origin, a spherical coordinate system and a three-dimensional rectangular coordinate system are established; finally, the detection vehicle is driven on a detected road, and the laser radar is rotated for scanning to acquire acquisition points on a guardrail in front of the vehicle, and the guardrail length L<0> scanned by the laser radar and the guardrail length L between the vehicle and a characteristic point at the farthest distance are calculated; if L is lean than L<s>, the real sight distance value of the detected road is L; and if L is greater than or equal to L<s>, L<s> is the realsight distance value of the detected road. According to the expressway sight distance detection method based on the laser radar, measurement is convenient and accurate, and the defects of a traditional sight distance detection method in the aspects of accuracy, timeliness and dynamic distance measurement can be effectively overcome.

Description

technical field [0001] The invention relates to the technical field of road traffic safety evaluation, in particular to a laser radar-based expressway line-of-sight detection method. Background technique [0002] Sight distance is an important design factor to ensure road safety, and it is a mandatory indicator in road construction standards. Each lane along the road should have enough sight distance to ensure that the driver can respond in time when encountering an emergency and ensure driving safety. Especially for highways, vehicles are traveling at a high speed, so sufficient line-of-sight protection is required. [0003] From the point of view of the means of ranging, the ranging technologies currently used are mainly divided into the following types: laser ranging, microwave radar ranging, ultrasonic ranging and machine vision system ranging. In the field of road traffic, as far as the distance measurement object is concerned, people mostly focus on the distance dete...

AI Technical Summary

Problems solved by technology

As far as the ranging process is concerned, the traditional methods are mostly static detection, and the detection speed is greatly limited

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