A multi-line laser radar

Abstract

The application discloses a multi-line laser radar, which includes a control unit, a transmitting unit connected to the control unit, a receiving unit, a scanning unit, a wireless transmission unit, and a power supply unit; the control unit receives triggers from the scanning unit at different angles The signal controls the transmitting unit to transmit, and after it is irradiated on the detection object, the received echo is amplified by the receiving unit, and then the logic level signal is used for timing and distance measurement, and the reflectivity intensity is calculated according to the width of the level signal. The control unit combines The angle information and distance information in the horizontal and vertical directions are used to obtain a three-dimensional point cloud; the invention uses the characteristics of multiple pixels of the array detector, and the angle information is obtained through the pixel position, and the array detector uses the size arrangement of non-uniform micro elements Cloth, to obtain a high-density test point cloud in the central area, and when matching with the receiving lens, the length of both ends of the detector increases as the edge distortion increases, which facilitates the uniformity of the receiving angle.

Description

technical field [0001] The patent of the present invention relates to the technical field of laser detection, in particular to a multi-line laser radar. Background technique [0002] Laser scanning ranging radar can be used to detect the position, contour and speed of the target. The application field of laser ranging radar is gradually expanding, accurate measurement, navigation and positioning, safe obstacle avoidance, and it is beginning to be applied to unmanned driving technology. Laser scanning radar is the The emitted laser beam forms a scanning section through scanning emission, so as to test the characteristic information of the object to be measured. At present, the 3D scanning lidar is multi-layer scanning in the vertical direction, which can well reflect the characteristic information of the object to be measured, and is suitable for many fields, such as unmanned navigation and shape contour detection. [0003] The current 3D scanning lidar mostly adopts the mul...

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Problems solved by technology

[0003] The current 3D scanning lidar mostly adopts the multi-line scanning method, that is, multiple laser tubes are used to emit sequentially, and the structure is that multiple laser tubes are arranged vertically. receiving detectors to ensure that each receiving detector corresponds to the field of view angle of the emitting laser tube. Therefore, the installation and adjustment process is very complicated, which is not conducive to production and mass production. At the same time, because multiple receiving detectors and transmitting units The stacking makes the volume of the lidar with a higher number of lines doubled, and since each detector has the same size, how to make the point cloud information more dense in the central area in the vertical direction is also the current multi-line lidar intractable problem

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