Four-dimensional spectral imaging system and method for calculating correlation flight time by means of sparse aperture compression

Abstract

The invention relates to a four-dimensional spectral imaging system for calculating correlation flight time by means of sparse aperture compression. The four-dimensional spectral imaging system comprises a pulse light source emission unit, an expanded beam lens, a fourth collimating lens, a random optical modulation unit, a total-reflection mirror, a polarized light beam splitter, a first lens, a beam spot synthesis unit, a sparse aperture unit, a free space collimation unit, a beam reflection unit, an expanded beam collimation unit, a spectral beam split unit, a convergence light receiving lens, a linear array detector, a flight time correlation unit and a compression calculation correlation algorithm module. The sparse aperture unit comprises at least three secondary telescope lenses, the free space collimation unit comprises at least three collimating lenses, and the beam reflection unit comprises at least three reflection mirror groups; one secondary telescope lens, one collimation lens and one reflection mirror form a light path; the flight time correlation unit comprises a pulse width regulation unit, an adjustable delay unit and a synchronous signal source.

Description

technical field [0001] The invention relates to the field of sparse aperture four-dimensional spectral imaging, in particular to a sparse aperture compression calculation associated time-of-flight four-dimensional spectral imaging system and method. Background technique [0002] With the development of laser technology and photoelectric detectors, many types of lidar systems have been widely used in wind detection, imaging around obstacles, atmospheric detection, underwater detection and other fields. LiDAR (Light Detection and Ranging) is a typical laser radar system that emits laser beams to detect the position, speed and other characteristics of the target. In terms of working principle, there is no fundamental difference from microwave radar: a detection signal (laser beam) is emitted to the target, and then the received signal reflected from the target (target echo) is compared with the transmitted signal, and after appropriate processing The relevant information of th...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the time-of-flight four-dimensional spectral imaging system in the prior art, such as low pixels and slow reading speed, thereby providing a four-dimensional spectral imaging system and method with high spectral resolution

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