Laser pulse emitting and receiving methods, medium and laser radar system

Abstract

The invention relates to laser pulse emitting and receiving methods, a medium and a laser radar system. The laser radar system comprises an emission module and a detection module; the emission modulegenerates and emits one or multiple laser pulse(s) of the preset wavelength, and comprises a generation sub-module, a wavelength division multiplexing sub-module and an output sub-module; the detection module receives and processes a reflection signal of the laser pulse of the preset wavelength to obtain distance information of a barrier, and comprises a filtering sub-module and a detection sub-module coupled to the filtering sub-module. Different preset wavelengths are set in different laser radar systems, each laser radar system only emits laser pulses of the corresponding preset wavelengthand receives the reflection signal of the laser pulse of the corresponding wavelength, the cost can be lower, and interference among different laser radar systems is avoided effectively.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of environmental perception, and in particular, to a method, medium, and laser radar system for transmitting and receiving laser pulses. Background technique [0002] Since it can detect whether there is an obstacle in front of driving and provide the distance information of the obstacle, the lidar system is widely used in the field of automatic driving. In practical applications, lidar is based on the direct time-of-flight method, by emitting a laser pulse with a narrow width but high peak power, and then measuring the time of light flight back and forth between the pulse and the obstacle for distance measurement. When multiple laser radar systems work at the same time, the pulse emitted by one laser radar or the pulse signal reflected by the target obstacle may cause misjudgment of the signal of another laser radar, resulting in incorrect distance measurement results. For example, wh...

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Problems solved by technology

[0004] Although the existing laser radar system can reduce the interference between the laser radar systems through code modulation, the laser pulse width, sampling interval and peak transmission power used in it have certain limitations, which makes the laser radar system more sensitive to the laser and the receiving system. Strict requirements are put forward, which is not conducive to engineering realization in the actual process, and the cost is high

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