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Bistatic radar imaging method based on tomography principle

A technology of bistatic radar and imaging method, applied in the field of radar, can solve problems such as low resolution, and achieve the effect of improving imaging resolution, enriching target scattering information, and reducing bandwidth requirements

Active Publication Date: 2018-06-12
XIDIAN UNIV
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Problems solved by technology

Combining bistatic radar and SAR / ISAR imaging has certain advantages, but bistatic SAR / ISAR imaging still has many disadvantages
For example, the bistatic ISAR imaging method has low resolution in small-angle imaging and large-angle cross-range unit imaging

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  • Bistatic radar imaging method based on tomography principle
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  • Bistatic radar imaging method based on tomography principle

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Embodiment Construction

[0054] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0055] Currently, due to the limited spectrum resources and the complexity of wideband signal processing, narrowband radar imaging has a significant demand. Computer tomography based on Radon transform and projective slice theorem has a wide range of applications in the medical field, and many scholars have introduced the principle of tomography into the field of radar imaging. Radar tomography technology can realize narrow-band signal imaging well. Compared w...

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Abstract

The invention belongs to the technical field of radars, and discloses a bistatic radar imaging method based on a tomography principle. The method comprises the steps that a bistatic radar tomography imaging system model is established; a bistatic radar echo signal is acquired, and is transformed to a frequency domain through dechirping; the signal is de-skewed, and the acquired baseband echo signal is transformed into a wavenumber domain; an image reconstruction model of a filter back-projection algorithm based on the tomography principle is acquired; through the tomography principle, the relationship between the bistatic radar wavenumber domain echo signal and a target scattering intensity function is established; and image reconstruction is carried out to acquire a bistatic radar tomography reconstruction image. According to the technical scheme provided by the invention, the tomography principle and a bistatic radar are combined to reduce the bandwidth requirement of radar imaging;a narrow-band radar can acquire better resolution; and the method is particularly suitable for imaging in a large corner.

Description

technical field [0001] The invention belongs to the field of radar technology, and in particular relates to a bistatic radar imaging method based on tomographic principles, which is suitable for improving the imaging resolution of bistatic radar under the condition of large rotation angle by increasing the accumulation angle. Background technique [0002] Radar imaging is one of the most important tasks of modern radars. At present, SAR imaging and ISAR imaging are the most widely used in the field of radar imaging. These two imaging methods rely on large bandwidth to achieve high resolution in distance, and achieve high resolution in azimuth by synthesizing large array apertures. Bistatic SAR and ISAR imaging are mostly studied at present. [0003] Bistatic radar has many institutional advantages. Bistatic radar can obtain richer target scattering information and a longer detection distance. In addition, in the actual battlefield environment, the separation of the transmit...

Claims

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Application Information

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IPC IPC(8): G01S13/90G01S7/41
CPCG01S7/41G01S13/90G01S13/9058
Inventor 李军亢海龙卫雨松亢龙欢张玉洪常峻青薛玉喜
Owner XIDIAN UNIV
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