A lidar imaging device and imaging method based on compressed sensing

Abstract

A laser radar imaging device and method based on compressed sensing, the device includes an amplitude modulated laser light source, a beam expander, two lenses, a DMD digital micromirror, an APD photodetector, a high-pass filter, and a multiplier , a low-pass filter, two AD analog-to-digital converters, a control system, and an image reconstruction system; after the laser is emitted, it is scattered by the imaging object and projected onto the surface of the DMD digital micromirror, and the reflected light is focused by another lens and then sent by the APD The single-point detector receives and converts it into an amplified voltage signal; the voltage signal passes through high-pass filtering, frequency mixing and low-pass filtering in sequence on one parallel branch, and enters the reconstruction system through analog-to-digital conversion; at the same time, the voltage signal passes through another parallel branch The branch directly enters the reconstruction system through analog-to-digital conversion; according to the input signal on the two branches and the random matrix corresponding to the DMD control device, combined with a certain reconstruction algorithm, the reconstruction system can complete imaging; the present invention largely Improving imaging speed and imaging quality.

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

Images