A Lidar Orthogonal Transceiver System Based on Discretely Adjustable Grating

Abstract

The present invention provides a laser radar orthogonal transceiver system based on discrete adjustable gratings, including: a transmitting unit and a receiving unit; wherein, the transmitting unit transmits light wave signals along a first direction with a specific far-field radiation pattern, and along the second direction Scanning in two directions; the receiving unit receives the light detection signal emitted by the transmitting unit and reflected by the object to be measured along the second direction, and scans along the first direction; the first direction and the The second direction is vertical; wherein, the emitting unit and / or the receiving unit includes a surface grating array composed of a plurality of surface gratings. The laser radar quadrature transceiver system uses a surface grating array of discrete tunable gratings instead of a continuously tunable phased array grating, thus making its structure simple.

Description

technical field [0001] The invention relates to the technical field of laser radar, more specifically, to a laser radar orthogonal transceiver system based on a discrete adjustable grating. Background technique [0002] Lidar technology is widely used in fields such as ground exploration, archaeology, and autonomous driving. [0003] At present, lidar scanning technology can be roughly divided into two categories: mechanical scanning and solid-state scanning. Traditional mechanical scanning is expensive and not conducive to mass production; the existing LiDAR solid-state two-dimensional scanning requires an N×N phase shifter array, and with the improvement of measurement accuracy and area, the number of phase shifters will be significantly increased. Increase, will cause difficulties in manufacturing and signal configuration. [0004] Although the use of the orthogonal transceiver lidar system can reduce the N×N phase shifter array required by the original solid-state two-...

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Problems solved by technology

Traditional mechanical scanning is expensive and not conducive to mass production; the existing LiDAR solid-state two-dimensional scanning requires an N×N phase shifter array, and with the improvement of measurement accuracy and area, the number of phase shifters will be significantly increased. increases, which can cause difficulties in manufacturing and signal configuration

[0004] Although the use of the orthogonal transceiver lidar system can reduce the N×N phase shifter array required by the original solid-state two-dimensional scanning of the lidar to 2N, but the scanning by the general on-chip phased array method will cause problems due to waveguide The grating lobe is generated when the spacing is too large; although this scanning problem can be solved by means of a wide-body surface grating, the obtained strip radiation pattern is not very uniform, and the radiation width is relatively limited, and parallel reception cannot be performed.

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