ISAR sparse imaging method of V frequency modulation signal under low signal-to-noise ratio condition

A low signal-to-noise ratio, sparse imaging technology, applied in radio wave reflection/re-radiation, using re-radiation, measuring devices, etc., to improve detection distance and resolution, eliminate distance and speed ambiguity, and improve imaging capabilities

Inactive Publication Date: 2020-03-17
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

At present, ISAR sparse imaging methods such as linear frequency modulation and step frequency based on compressive sensing have been researched, but ISAR sparse imaging methods for V FM signals in the case of low signal-to-noise ratio are in urgent need of research

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  • ISAR sparse imaging method of V frequency modulation signal under low signal-to-noise ratio condition
  • ISAR sparse imaging method of V frequency modulation signal under low signal-to-noise ratio condition
  • ISAR sparse imaging method of V frequency modulation signal under low signal-to-noise ratio condition

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Embodiment Construction

[0037] The present invention will be further described below in conjunction with the accompanying drawings.

[0038] A kind of V FM signal ISAR sparse imaging method under the condition of low signal-to-noise ratio of the present invention, the steps are as follows:

[0039] The first step is to perform pulse compression processing on the sparse V FM echo signal

[0040] After the V FM signal is scattered by the target, the echo signal at the radar receiver is:

[0041]

[0042] where I represents the total number of scattering points of the target, σ i Indicates the scattering intensity of the i-th scattering point, T p represents the pulse duration, c represents the propagation speed of electromagnetic waves, exp is an exponential function, j is a unit imaginary number, Indicates fast time, t m means slow time, t means total time, R i Indicates the distance from the i-th scattering point to the radar, γ indicates the modulation frequency, f 0 Indicates the carrier ...

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Abstract

The invention discloses an ISAR sparse imaging method of a V frequency modulation signal under a low signal-to-noise ratio condition. The method comprises the following steps: step one, carrying out pulse compression processing on a sparse V frequency modulation echo signal; and step two, carrying out improved weighted compressed sensing reconstruction to obtain a target image. The method has thefollowing beneficial effects: firstly, the detection distance and resolution are improved and the distance and speed ambiguity can be eliminated by the V frequency modulation signal, and the two-dimensional resolution capability can be enhanced; secondly, a V frequency modulation signal sparse echo model problem is solved, the target ISAR image can be reconstructed through small measurement data,and the requirement for multifunctional and multi-task application under modern radar resource scheduling can be better met; and thirdly, the target image can be accurately reconstructed through the improved weighted compressed sensing method under the condition of low signal-to-noise ratio, and the imaging capability under the conditions of noise and the like is enhanced.

Description

【Technical field】 [0001] The invention discloses a V-FM signal ISAR sparse imaging method under the condition of low signal-to-noise ratio, which belongs to the technical field of radar detection, and further relates to a sparse V-FM signal ISAR imaging method, specifically a V-FM signal ISAR based on improved weighted compression sensing The sparse imaging method can obtain better radar target imaging effect under the condition of low signal-to-noise ratio. 【Background technique】 [0002] Inverse synthetic aperture radar (ISAR) imaging technology plays an important role in radar detection, identification, and classification of moving targets, and is widely used in microwave detection of aerospace targets (such as artificial satellites, space debris, etc.). In radar imaging, pulse compression technology and large time-width-bandwidth product signals are often used to improve the detection distance and imaging resolution. Compared with the two-dimensional ambiguity effect of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S13/9029G01S13/9064
Inventor 潘小义陈吉源谢前朋赵锋冯德军艾小锋顾赵宇肖顺平
Owner NAT UNIV OF DEFENSE TECH
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