Method and device for non-uniformly sampling singular points of multichannel synthetic aperture radar system

A synthetic aperture radar and non-uniform sampling technology, which is applied in the direction of measuring devices, radio wave measurement systems, radio wave reflection/reradiation, etc., to achieve the effect of solving failure and good image signal-to-noise ratio

Active Publication Date: 2015-06-10
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

[0004] In view of this, the main purpose of the present invention is to provide a method and device for non-uniform sampling singular points in a multi-channel synthetic aperture radar system, which can effectively solve the problem of singular points in multi-channel non-uniform sampling reconstruction

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  • Method and device for non-uniformly sampling singular points of multichannel synthetic aperture radar system
  • Method and device for non-uniformly sampling singular points of multichannel synthetic aperture radar system
  • Method and device for non-uniformly sampling singular points of multichannel synthetic aperture radar system

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Embodiment Construction

[0031] The basic idea of ​​the present invention is: determine the position of the singularity point, perform data discarding processing on the multi-channel original echo; reconstruct the data retained after the discarding process according to the frequency domain reconstruction filter algorithm, obtain the reconstructed echo signal, and image The first image is obtained; the discarded data is reconstructed according to the frequency domain reconstruction filter algorithm to obtain a reconstructed echo signal, and imaging is performed to obtain a second image, and the first image and the second image are superimposed to obtain a third image.

[0032] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] The present invention realizes a method for non-uniformly sampling singular points in a multi-channel synthetic aperture radar system, such as figure 1 As shown, the method includes the fo...

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Abstract

The disclosure discloses a method for non-uniform sampling of a singularity point of a multi-channel Synthetic-Aperture Radar (SAR) system. The position of a singularity point is determined and rejection of data is performed for raw echoes of multiple channels. According to a frequency-domain reconstruction filter algorithm, data remained after the rejection are reconstructed to obtain a reconstructed echo signal and imaging is performed to obtain a first image. Rejected data are reconstructed according to the frequency-domain reconstruction filter algorithm to obtain a reconstructed echo signal, imaging is performed to obtain a second image, and the first image and the second image are superimposed to obtain a third image. The disclosure further discloses a device for non-uniform sampling of a singularity point of a multi-channel SAR system. The technical solution of the disclosure can solve the problem of a frequency-domain reconstruction filter failure caused by a singularity point and obtain a higher image Signal to Noise Ratio (SNR) through image compensation.

Description

technical field [0001] The invention relates to a multi-channel non-uniform sampling reconstruction technology, in particular to a method and device for non-uniform sampling singular points of a multi-channel synthetic aperture radar system. Background technique [0002] Multi-channel Synthetic Aperture Radar (SAR) technology is the key technology to solve the contradiction between SAR azimuth resolution and imaging bandwidth, and it is of great significance to the development and application of SAR. [0003] The main technical problem of multi-channel SAR systems is that sampling inhomogeneity occurs when the pulse repetition period (PRF) deviates from uniform sampling. Generally, the reconstruction of non-uniform sampling can be realized through the frequency domain reconstruction filter, but for a special PRF position, the frequency domain reconstruction filter will fail due to a singular point, resulting in a failed reconstruction effect. Contents of the invention [...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): G01S7/285G01S13/90
CPCG01S13/9011
Inventor郭磊王宇邓云凯罗秀莲倪江赵凤军刘悦
OwnerINST OF ELECTRONICS CHINESE ACAD OF SCI