Compressed-sensing-based sparse aperture imaging system and method

A sparse aperture and compressed sensing technology, which is applied in the direction of using optical devices to transmit sensing components, etc., to achieve the effects of saving costs, avoiding background noise and electrical noise, and saving detection dimensions

Active Publication Date: 2015-04-15
NAT SPACE SCI CENT CAS
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Problems solved by technology

However, the diameter of the primary mirror of a space telescope is limited by the volume and mass of the rocket launch, and is also limited by engineering technology and manufacturing costs. Therefore, it is necessary to develop sparse aperture technology to break through the aperture limit

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  • Compressed-sensing-based sparse aperture imaging system and method
  • Compressed-sensing-based sparse aperture imaging system and method
  • Compressed-sensing-based sparse aperture imaging system and method

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Embodiment Construction

[0028] The present invention will be further described now in conjunction with accompanying drawing.

[0029] The compressed sensing-based free sparse aperture imaging system of the present invention adopts the principle of compressed sensing (Compressive Sensing, referred to as CS), which can be randomly sampled with fewer data samples (far lower than Nyquist / Shannon sampling The limit of the theorem) perfectly recovers the original signal. The basic operations of compressed sensing include: firstly, using prior knowledge, select a suitable sparse basis Ψ, so that x' obtained by point spread function x transformed by Ψ is the most sparse; Under the condition of A and sparse basis Ψ, a mathematical model y=AΨx′+e is established, and the convex optimization is performed through the compressed sensing algorithm. After obtaining x’, the Inverts to x.

[0030] A sparse-aperture imaging system is generally composed of multiple sub-apertures with the same shape, and the pupil fun...

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Abstract

The invention relates to a compressed-sensing-based sparse aperture imaging system, which comprises a sparse aperture unit, a free space collimation unit, a beam transformation unit, a beam spot synthesis lens, a spatial light modulator mapping lens, a spatial light modulator, a converging and light receiving unit, a point detector and a compressed sensing calculation module, wherein an incident light signal on each light path is projected onto the beam spot synthesis lens to realize sparse aperture direct imaging; a sparse aperture is directly imaged and mapped to the spatial light modulator through the spatial light modulator mapping lens; the spatial light modulator is used for randomly modulating a sparse aperture imaging light field according to a random optical modulation matrix, and converging a light field intensity signal obtained by sparse aperture imaging light field modulation to the light-sensitive surface of the point detector through the converging and light receiving unit; the point detector is used for acquiring the light field intensity signal to form a measurement signal, and transmitting the random optical modulation matrix and the measurement signal to the compressed sensing calculation module; and the compressed sensing calculation module is used for reconstructing an image by using a compressed sensing algorithm.

Description

technical field [0001] The invention relates to the field of sparse aperture imaging, in particular to a sparse aperture imaging system and method based on compressed sensing. Background technique [0002] Since the Hubble Telescope began to observe in space, the era of space astronomy observation has opened. With the further development of astronomical observation requirements, the demand for higher-resolution observations is gradually increasing, requiring the space telescopes to have larger and larger apertures, and the demand for higher angular resolution requires the development of large-aperture observation telescopes. However, the diameter of the primary mirror of a space telescope is limited by the volume and mass of the rocket launch, as well as by engineering technology and manufacturing costs. Therefore, it is necessary to develop sparse aperture technology to break through the aperture limitation. Many research institutions have developed lens splicing technolog...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/26
Inventor 孙志斌
Owner NAT SPACE SCI CENT CAS
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