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Nonuniform frequency spectrum reconfiguration method of orientation multi-beam synthetic aperture radar

A synthetic aperture radar and multi-beam technology, applied in the radio wave measurement system, radio wave reflection/re-radiation, using re-radiation, etc., can solve problems such as large amount of calculation

Inactive Publication Date: 2010-05-05
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

The time-domain reconstruction method and the Spectra-fit method are simple and easy to implement, but the amount of calculation is large, which is difficult to meet the requirements for real-time radar systems

Method used

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  • Nonuniform frequency spectrum reconfiguration method of orientation multi-beam synthetic aperture radar
  • Nonuniform frequency spectrum reconfiguration method of orientation multi-beam synthetic aperture radar
  • Nonuniform frequency spectrum reconfiguration method of orientation multi-beam synthetic aperture radar

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Embodiment Construction

[0028] The following describes in detail the derivation process of each step of the present invention, and illustrates the beneficial effects of the present invention with examples.

[0029] The present invention includes four steps: Step 1. Establish an azimuth multi-beam SAR non-uniformly sampled signal model as the basis for deriving the spectrum reconstruction algorithm; Step 2. According to the non-uniformly sampled signal in step 1, use the FrFT algorithm to derive a suitable azimuth Non-uniformly sampled signal reconstruction algorithm for beam SAR; Step 3. Use the reconstruction algorithm derived from step two to reconstruct the non-uniformly sampled signal spectrum obtained in step one into the uniformly sampled signal spectrum; Step four. Use CS algorithm to sample uniformly The signal spectrum is imaged, so as to realize the two-dimensional focus imaging of the azimuth multi-beam SAR.

[0030] step one

[0031] Such as figure 1 As shown, the radar antenna is divided into ...

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Abstract

The invention discloses a nonumiform frequency spectrum reconfiguration method of an orientation multi-beam synthetic aperture radar, belonging to a processing technology of synthetic aperture radar signals and solving the problems of high imaging false rate and poor imaging quality of nonuniform sampling signals. The method comprises the following steps of: (1) establishing a periodical nonuniform sampling echo signal model; (2) deducing a frequency spectrum reconfiguration algorithm of an orientation multi-beam SAR nonuniform sampling signal based on the FrFT frequency spectrum theory; (3) reestablishing a nonuniform sampling signal frequency spectrum into a uniform sampling signal frequency spectrum; and (4) imaging the uniform sampling signal frequency spectrum and realizing two-dimensional focus imaging of an orientation multi-beam SAR by a CS algorithm. The invention can not only greatly reduce the false rate of the nonuniform sampling signal imaging of the orientation multi-beam synthetic aperture radar, but also greatly improve the imaging quality.

Description

Technical field [0001] The invention relates to a method for reconstructing the spectrum of a non-uniformly sampled signal into a spectrum of a uniformly sampled signal, in particular to a method for reconstructing the non-uniform spectrum of an azimuth multi-beam synthetic aperture radar. [0002] (Suggestion: The present invention belongs to the field of synthetic aperture radar (SAR) signal processing. It is particularly suitable for single-platform azimuth multi-beam SAR where changes in pulse repetition frequency or platform flight speed cause periodic non-uniform sampling of the azimuth echo signal Situation.) (Here only needs to describe the problems directly involved in this technology. The problem solved by this technology is to reconstruct the non-uniformly sampled spectrum into a uniformly sampled spectrum. Therefore, it is only necessary to explain here that the invention relates to a reconstruction method, synthetic aperture Radar signal processing is the field of app...

Claims

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Application Information

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IPC IPC(8): G01S13/90
Inventor 张顺生周宝亮戴春杨孔令坤
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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