Laser radar system

Abstract

A laser radar system provided by the present invention comprises a transmitting module and a receiving module, the transmitting module is used for transmitting a detection laser beam, the receiving module comprises a main receiving lens group, an auxiliary receiving lens group and a detection unit; the main receiving lens group is used for receiving and converging an echo signal of the detection laser beam reflected by a to-be-detected target, so that the signal is received by the detection unit; the auxiliary receiving lens group is used for receiving and diverging an echo signal of the detection laser beam reflected by a to-be-detected target, so that the echo signal can be received by the detection unit; and the detection unit is used for receiving and processing the echo signals transmitted by the main receiving lens group and / or the auxiliary receiving lens group. According to the laser radar system, the main receiving lens group and the auxiliary receiving lens group are arranged for detection, the auxiliary receiving lens group performs effective detection under the short-distance condition, the defect that a non-coaxial laser radar has a short-distance optical detection blind area is overcome, and it can be ensured that the signal-to-noise ratio is high during short-distance detection.

Description

technical field [0001] The invention relates to the technical field of laser radar, in particular to a laser radar system. Background technique [0002] Lidar is an active detection system. Its working principle is to actively transmit laser signals to the target to be measured, and receive the laser signal reflected by the target. By comparing and analyzing the characteristics of the transmitted and received signals, the information of the target to be measured is obtained. . [0003] At present, many lidars are based on the pulse time-of-flight (PTOF) ranging principle to detect the distance and contour of the target. For two-dimensional lidar, according to its transmitting and receiving optical path structure, it can be divided into coaxial optical path and non-coaxial optical path. Because the non-coaxial optical path does not interfere with each other between the transmitting optical path and the receiving optical path, and the structure is relatively simple, it has b...

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Problems solved by technology

[0004] However, in the process of implementing the embodiments of the present invention, the inventors found that the common non-coaxial optical path has at least the following defects in practical application: that is, there is a problem of short-distance detection of blind areas

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