Active imaging system and method based on sparse aperture compressing calculation correlation

Abstract

The invention relates to an active imaging system based on sparse aperture compressing calculation correlation. The system comprises a polarization light source emitting unit, a beam expanding lens, a fourth collimating lens, a random optical modulation unit, a sparse aperture unit, a free space collimation unit, a beam reflecting unit, a beam combining unit, a first lens, a polarized light beam splitter, a completely reflecting lens, a convergence light collecting lens, a light detector and a compressing calculation correlation algorithm module. Popularized light emitted by the polarized light source emitting unit is reflected to the random optical modulation unit, random phase modulation is carried out, the polarized light is reflected to the first lens and then to an object to be measured, the object to be measure reflects the polarized light, the reflected polarized light is reversely transmitted to the convergence light collecting lens to be focused on the light detector, light signals are collected, a measured number sequence is output, the random optical modulation unit and the light detector are synchronous, the final measured matrix and the measured number sequence are transferred to the compressing calculation correlation algorithm module, and the reflected light image of the object is reconstructed based on the compressing calculation correlation algorithm.

Description

technical field [0001] The invention relates to the field of sparse aperture active imaging, in particular to an active imaging system and method based on sparse aperture compression calculation correlation. Background technique [0002] In the imaging detection of medium and long-distance targets, according to the presence or absence of illumination sources, there are two imaging methods: active imaging and passive imaging. The biggest feature of passive imaging is that it does not have a light source. It relies on the target or the environment to reflect natural light such as the sun or the target's own radiation, and uses imaging equipment to detect these weak signals and finally image them. Active imaging refers to the use of artificial lighting, the use of an artificial optical radiation source to illuminate the target, and the use of receivers to collect and detect part of the direct or reflected light radiation of the target scene and finally image it. Due to the adv...

AI Technical Summary

Problems solved by technology

In addition, in the application fields of low light and night vision, long-distance small target detection and deep space target detection and imaging, the brightness is low and is seriously affected by the transmission of the atmosphere, especially the backscattering of the atmosphere, making the most sensitive low light TV The system also does not provide sufficient resolution to detect and identify targets, and infrared imaging systems are also limited by low temperature contrast

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