ISAR radar imaging method applied to signal deletion occasions

A signal-missing, radar imaging technology, applied in the direction of utilizing re-radiation, reflection/re-radiation of radio waves, measuring devices, etc., can solve problems such as blurring, ISAR image damage, etc.

Active Publication Date: 2017-11-10
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Echo processing will zero out the damaged or missing pulse data, and the traditional Fourier transform-based radar imaging method is used for imaging, and the obtained ISAR image is usually damaged or blurred

Method used

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  • ISAR radar imaging method applied to signal deletion occasions
  • ISAR radar imaging method applied to signal deletion occasions
  • ISAR radar imaging method applied to signal deletion occasions

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Embodiment Construction

[0055] The effectiveness of the proposed method of the present invention is described in detail below through an imaging example in conjunction with the accompanying drawings:

[0056] Refer to attached figure 1 , the specific implementation steps of the present invention are as follows:

[0057] Step 1. Bistatic ISAR Target Echo Signal Analysis

[0058] Assuming that the echo data has been compensated for translation, the equivalent turntable target imaging is analyzed as an example. The geometric relationship between the radar and the target in the imaging plane is shown in the attached image 3 shown. Assume that the target coordinate system in the radar imaging plane is XOY, and the reference coordinate system is X s OY s , where X s The positive direction of the axis coincides with the equivalent radar line of sight direction, which is the observation distance direction, Y s The axis is the viewing direction. Target at X s OY s The electromagnetic scattering dist...

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Abstract

The invention belongs to the radar signal processing technology field and relates to an ISAR radar imaging method applied to signal deletion occasions. Sparsity generated by the effect of the imaging space on an emission signal is fully utilized, sparse sampling of echo of partial-loss double base ISAR is carried out to acquire measurement data, a sparse base is constructed in an imaging plane, and a high precision estimation value of imaging point space distribution is acquired through a reconstruction algorithm. The method is advantaged in that multiple restrictions based on a Fourier transform algorithm are solved, even under the condition of incomplete echo signals, the effect of target space distribution on the emission signal is utilized to construct the sparse base, only small-amount echo data is utilized, target space distribution characteristics can be reconstructed, imaging quality is almost not influenced by a large double base included angle, the imaging result has no radar sidelobe clutter interference, and super-resolution imaging can be realized.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and relates to an ISAR radar imaging method for lack of signals. Background technique [0002] Inverse synthetic aperture radar can acquire high-resolution moving target images all-weather and all-weather, and has a wide range of applications in military and civilian fields, such as target scattering mechanism analysis and target detection and classification. Compared with the conventional monostatic ISAR, the bistatic ISAR that separates the radar transmitter and receiver in different spatial positions has the following advantages: high security and concealment, strong anti-interference ability; Placed at the rear; the acquired information is rich, it can not only obtain the forward scattering information of the target, but also configure multiple receivers for interference processing. Like monostatic ISAR, bistatic ISAR images can also be easily obtained by the commonly used ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90G01S7/41
CPCG01S7/41G01S13/904G01S13/9064G01S13/9058
Inventor 范录宏刘东圣皮亦鸣曹宗杰李晋闵锐
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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