High-speed super-resolution stationary point scanning imaging method based on wavenumber domain coherence factor

A coherence factor and super-resolution technology, applied in the field of synthetic aperture imaging algorithm, can solve the problem of non-existence of super-resolution imaging algorithm
CN107390216BActive Publication Date: 2019-06-14JILIN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
JILIN UNIV
Publication Date
2019-06-14

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Abstract

The present invention discloses a wave number domain coherence factor-based high-speed super-resolution stagnation point scanning imaging method. The method specifically includes the following steps that: step 1, an antenna receives and records echo signals; step 2, a reflectance function is calculated; step 3, a coherence factor is calculated; and step 4, the coherent factor is used to correct an image. According to the algorithm of the invention, the concept of the space-domain coherence factor is expanded to the wave number domain, and a distance migration imaging algorithm is used in combination, and therefore, the method can have real-time imaging capacity; and if combined with a parallel algorithm, the method can further improve efficiency. Compared with a traditional distance migration imaging algorithm and back-projection imaging algorithm, the wave number domain coherence factor-based high-speed super-resolution stagnation point scanning imaging method has higher resolution and lower side lobe and can effectively suppress base noises. Since parameters alpha and beta are adopted to adjust the performance of the coherence factor, and the suppression of the coherence factor on side lobe and weak scattering points can be balanced, and therefore, performance is stable.
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Description

technical field

[0001] The invention relates to a synthetic aperture imaging algorithm, in particular to a high-speed super-resolution stationary point scanning imaging method based on wave number domain coherence factors. Background technique

[0002] Synthetic Aperture (SA) imaging algorithm is the most widely used radar imaging technology at present. The characteristic of this technology is based on the pulse compression technology. Compared with the traditional electromagnetic imaging method, the calculation amount is smaller and the memory requirement is smaller. Low and is the method of choice for real-time imaging systems. SA adopts a Born-approximated electric field signal model. In order to ensure the accuracy of the image, no far-field approximation is considered. The two most classic SA imaging methods are backprojection imaging algorithm (BPA) and distance migration imaging algorithm. (range migration algorithm, RMA). Both methods have their own characteristics...

Claims

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