Laser radar and distance measurement method thereof

Abstract

The invention discloses a laser radar and a distance measurement method thereof. The laser radar comprises two or more laser devices, a laser controller, a beam combiner, a detector, a time measurement device and an analysis module, wherein the laser controller controls the two or more laser devices to emit laser pulses at different moments by all amplitudes indicated by a preset amplitude sequence according to a preset time interval sequence; the beam combiner combines laser pulses emitted by the laser devices into the same emitting channel for emission; the detector receives echo pulses; thetime measurement device measures time intervals among all the echo pulses and / or pulse amplitudes of the echo pulses; the analysis module judges that the echo pulses are obtained by reflecting the laser pulses emitted by the laser devices after the laser pulses pass through an obstacle if the time intervals measured by the time measurement device and the preset time interval sequence are matched,and / or the measured pulse amplitudes and a preset pulse amplitude sequence are matched. In the technical scheme, the accuracy of measuring distance through the laser radar can be improved.

Description

technical field [0001] The invention relates to the field of measurement technology, in particular to a laser radar and a distance measuring method thereof. Background technique [0002] Long-range lidar can be used for distance measurement. It is usually based on the direct time-of-flight method, that is, by emitting a laser pulse with a narrow width but high peak power, and measuring the time of light flight back and forth between the pulsed light and the obstacle. [0003] However, in the same measurement range, there are multiple laser radars working at the same time, for example, when multiple laser radars are installed on a car, or when multiple vehicles equipped with laser radars are close The measurement principle of radar is based on measuring the time-of-flight of emitted laser pulses. If each laser radar cannot determine whether the received light pulses are sent by itself, then there is a certain probability that when receiving light pulses from other radars, it...

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Problems solved by technology

[0003] However, in the same measurement range, there are multiple laser radars working at the same time, for example, when multiple laser radars are installed on a car, or when multiple vehicles equipped with laser radars are close The measurement principle of radar is based on measuring the time-of-flight of emitted laser pulses. If each laser radar cannot determine whether the received light pulses are sent by itself, then there is a certain probability that when receiving light pulses from other radars, it will also It is judged as an echo signal, which leads to an error in the ranging result

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