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A variable pulse repetition interval sar imaging method based on compressed sensing

A technology of pulse repetition interval and imaging method, which is applied in the field of radar and can solve the problems of inability to perform high-precision imaging and non-sparse spectrum of surface targets.

Active Publication Date: 2022-02-01
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0004] In order to solve the problem that the existing low oversampling Staggered SAR imaging algorithm is limited by the PRI slow change mode and the surface target spectrum is not sparse and cannot perform high-precision imaging, the present invention proposes a low oversampling based on Compressive Sensing (CS) SAR imaging method

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  • A variable pulse repetition interval sar imaging method based on compressed sensing
  • A variable pulse repetition interval sar imaging method based on compressed sensing
  • A variable pulse repetition interval sar imaging method based on compressed sensing

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[0031] In order to facilitate those skilled in the art to understand the technical content of the present invention, the content of the present invention will be further explained below in conjunction with the description of terms.

[0032] First define the following terms:

[0033] Definition 1. Staggered SAR system

[0034] The concept of Staggered SAR was first proposed by European Aeronautic Defense and Space Company N.V. (EADS) to solve the problem that traditional SAR cannot achieve high-precision, wide-swath imaging (reference 5: "The Staggered SAR concept: Imaging a wide continuous swath with high resolution” [C]. M. Villano, et al. 14th International Radar Symposium (IRS). IEEE, 2013, 2:679-684).

[0035] Definition 2. Distance compression

[0036]Range compression is a pulse compression processing technique aimed at obtaining well-focused images (Reference 6: "Digital processing of synthetic aperture radar data" [J]. Cumming I G, Wong FH. Artech house, 2005, 1(2) ...

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Abstract

The invention discloses a variable pulse repetition interval SAR imaging method based on compressed sensing, which is applied in the field of radar technology, and aims at the limitation of the existing low oversampling Staggered SAR imaging algorithm to the pulse repetition interval (Pulse Repetition Interval, PRI) slow change mode In view of the problem that the target spectrum is not sparse and cannot be used for high-precision imaging, the present invention uses three-dimensional tensor, two-dimensional matrix and Hadamard ( The matrix multiplication of Hadamard) product embeds an optimization problem, and by solving the optimization problem, an image without orientation ambiguity is reconstructed, and the imaging performance reconstructed by the method of the present invention is not affected by low oversampling rate, PRI slow transformation mode and target type .

Description

technical field [0001] The invention belongs to the technical field of radar, in particular to a SAR imaging technology. Background technique [0002] Synthetic Aperture Radar (SAR) has a long range and wide coverage, and has all-weather and all-weather earth observation capabilities. However, traditional SAR cannot achieve high-precision, wide-swath imaging. In order to solve this problem, the researchers proposed a SAR system using a variable pulse repetition interval (Pulse Repetition Interval, PRI)—Staggered SAR. [0003] In the published literature, the oversampling rate of Staggered SAR can be divided into two types: high oversampling rate (2.9-3.5) and low oversampling rate (1.1-1.5) from the azimuth direction. The representative methods for highly oversampled Staggered SAR imaging mainly include Best linear unbiased (BLU) (Reference 1: M. Villano, et al. "Staggered SAR: High resolution wide-swath imaging by continuous PRIvariation, "IEEE Trans.Geosci.Remote Sens., ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90G01S7/41G01S7/285G01S7/292
CPCG01S13/9094G01S13/90G01S7/418G01S7/285G01S7/292
Inventor 刘喆廖杏杏王迪武俊杰
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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