Laser radar imaging device based on compressed sensing and imaging method

Abstract

A laser radar imaging device based on compressed sensing and an imaging method are disclosed. The device comprises an amplitude modulation laser light source, a beam expanding apparatus, two lenses, a DMD digital micro-mirror, an APD photoelectric detector, a high-pass filter, a multiplier, a low pass filter, two AD analog-digital converters, a control system and an image reconstruction system. After being emitted, the laser is scattered by an imaging object and then is projected to a surface of the DMD digital micro-mirror. Reflected light is focused by another lens, then is received by an APD single point detector and then is converted into an amplified voltage signal. High-pass filtering, mixing and low-pass filtering are successively performed on the voltage signal on one parallel branch and the signal penetrates into the reconstruction system after analog-digital conversion. Simultaneously, the voltage signal directly penetrates into the reconstruction system on another parallel branch after the analog-digital conversion. According to input signals of the two branches and a random matrix corresponding to a DMD control device, a certain reconstruction algorithm is combined so that the reconstruction system can complete imaging. By using the device and the method of the invention, an imaging rate and imaging quality are increased to a great extent.

Description

technical field [0001] The invention belongs to the technical field of lidar imaging, and in particular relates to a lidar imaging device and imaging method based on compressed sensing. Background technique [0002] At present, the mainstream imaging lidar has three types: unit scanning imaging, area array staring imaging and synthetic aperture imaging. Traditional scanning imaging radar needs to use devices such as mechanically moving scanning mirrors, and the imaging rate is low. Compared with it, the staring imaging lidar realizes "instantaneous" imaging, and has many advantages such as simple structure and relatively high imaging rate. However, judging from the existing models of staring imaging lidars so far, there are still problems in that the amount of data collection, transmission, and processing is too large, and the measurement distance and accuracy are not easy to improve at the same time. This also restricts the further improvement of imaging quality and imagi...

AI Technical Summary

Problems solved by technology

However, judging from the existing models of staring imaging lidars so far, there are still problems that the amount of data collection, transmission and processing is too large, and the measurement distance and accuracy are not easy to improve at the same time.

This also restricts the further improvement of imaging quality and imaging rate

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