Image reconstruction method of laser radar imaging system based on compressed sensing

A lidar imaging and image reconstruction technology, applied in the field of lidar and signal processing, can solve problems such as hindering the development of push-broom lidar and difficult large-scale integration

Inactive Publication Date: 2014-11-19
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology

However, it is difficult to achieve large-scale integration of linear array avalanche diode APD detectors. As far as the current technical means are

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  • Image reconstruction method of laser radar imaging system based on compressed sensing
  • Image reconstruction method of laser radar imaging system based on compressed sensing
  • Image reconstruction method of laser radar imaging system based on compressed sensing

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Embodiment Construction

[0068] Combine below figure 1 A better example of the present invention is given, mainly for further detailed description, but not for limiting the scope of the present invention.

[0069] The specific embodiment of the present invention is mainly divided into the following steps:

[0070] (1) First determine the technical parameters of the components used in each module of the system, as follows: Laser emission module 1 adopts the laser of Shanghai Brillouin Laser Technology Co., Ltd., and the technical indicators are: working wavelength 1064nm, repetition frequency 100Hz, pulse energy 200mJ; The telescope imaging module 2 adopts the telescope of Edmund Optics (Shenzhen) Co., Ltd., the selected focal length is 304.8mm, and the aperture is 101.6mm. The digital micromirror DMD and the control module 3 adopt the DMD produced by TI Company of the United States, the technical index is 1024×768 pixels, the pixel size is 13.69 μm, the control board adopts the TI-Discovery-4100 matc...

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Abstract

The invention discloses an image reconstruction method of a laser radar imaging system based on compressed sensing. The laser radar imaging system in the method adopts a unit avalanche photodiode APD, and the bottleneck that the present domestic linear array avalanche photodiode cannot be integrated in a large scale is effectively broken. The system is composed of a laser transmitting module, a telescope imaging module, a digital micro-mirror device DMD and control module, an avalanche photodiode APD, a synchronization module, a data acquisition module, and an image reconstruction module. Pulse laser is transmitted to targets by the laser transmitting module, and echoes reflected by the targets at different distances are modulated by a digital micro-mirror device DMD; then, the echoes are transmitted to the unit avalanche photodiode APD through a converging lens so as to realize sampling in time sequence; and finally, the three-dimensional image of each target is reconstructed by a subsequent image reconstruction method. The image reconstruction method has the following advantages: no scanning is needed, the structure is simple, only a small amount of data is required for image reconstruction, and the detection sensitivity is high.

Description

technical field [0001] The invention relates to computational imaging technology and image reconstruction algorithm, signal processing and laser radar. In particular, it relates to an image reconstruction method of a lidar imaging system based on compressed sensing. Background technique [0002] Lidar is an active photoelectric imaging technology. Compared with ordinary passive optical remote sensing detection and microwave radar, it has high resolution, good concealment, strong anti-interference ability, etc.; it can detect real objects through clouds, vegetation, etc. ground terrain. LiDAR transmits pulsed laser signals to the target, and then processes the received signal (echo signal) reflected from the target and the transmitted signal, so that relevant information of the target can be extracted, such as target distance, orientation, and attitude. , shape and other parameters. Using this kind of laser radar, in the military, it is possible to track, detect and identi...

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Application Information

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IPC IPC(8): G01S17/89
CPCG01S17/89G01S7/48
Inventor 马彦鹏舒嵘亓洪兴王义坤王雨曦葛明锋
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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