Vehicle-mounted laser distance measuring device

Abstract

The invention discloses a vehicle-mounted laser distance measuring device comprising a micro-control unit MCU, a laser emission circuit and a receiving end circuit. The laser emission circuit is used for emitting laser according to control of the MCU. The receiving end circuit is used for generating an echo signal according to laser reflected by a barrier. The vehicle-mounted laser distance measuring device also comprises an internal light path detection circuit which is used for providing an internal light path excitation signal to act as an initial signal for triggering signal counting. The internal light path excitation signal is the signal generated in a way that laser emitted by the laser emission circuit is partially reflected. Besides, laser is reflected via the internal part of the laser emission circuit. The MCU is also used for obtaining distance between the barrier and a vehicle according to the initial signal and the echo signal. With application of the vehicle-mounted laser distance measuring device, optical components of the internal light path detection circuit are simplified, and system application is more flexible so that accuracy of laser distance measurement and degree of easy installation of the vehicle-mounted laser distance measuring device are enhanced.

Description

technical field [0001] The invention relates to a vehicle ranging system, in particular to a vehicle-mounted laser ranging device. Background technique [0002] In vehicle-mounted laser ranging, the laser light source installed on the vehicle is used to emit laser light, and the time required for the laser to be reflected back by the obstacle is used to obtain the distance between the obstacle and the vehicle. Usually, the time counting chip is used to obtain the start time of laser emission and the reflection time of the laser being reflected back. The time difference between the start time and the reflection time reflects the time required for the obstacle to reflect the laser back. Among them, the start time of laser emission is obtained by counting the optical signal of the inner optical path as the trigger signal, and the reflection time is obtained by the light reflected by the obstacle. [0003] In the prior art, the beam splitter of the inner optical path is impleme...

AI Technical Summary

Problems solved by technology

[0004] However, the thickness of the front windshield, the reflectivity of the glass and the installation of the laser rangefinder will have a great impact on the reflected signal used as the internal optical path detection circuit, which increases the difficulty of assembly

At the same time, the movement of the vehicle will also affect the effect of the inner optical path, resulting in a decrease in the accuracy of laser ranging

Images