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Inverse synthetic aperture radar self-focusing imaging method based on double sparse constraints

An inverse synthetic aperture and sparse constraint technology, applied in the field of focused imaging, can solve the problems of poor imaging effectiveness, time-consuming, and inability to achieve real-time imaging processing, so as to eliminate the influence of phase error and realize the effect of focused imaging

Inactive Publication Date: 2015-11-25
XIDIAN UNIV
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Problems solved by technology

Although imaging at a sampling frequency lower than Nyquist is achieved, this method often takes a lot of time, cannot achieve real-time imaging processing, and has poor imaging effectiveness, making it only able to process smaller Scenes

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  • Inverse synthetic aperture radar self-focusing imaging method based on double sparse constraints
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  • Inverse synthetic aperture radar self-focusing imaging method based on double sparse constraints

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Embodiment Construction

[0032] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0033] refer to figure 1 , the specific implementation steps of the present invention are as follows:

[0034] Step 1: Obtain the echo signal S r (τ,t).

[0035] (1a) The radar continuously transmits the chirp signal S to the sparse target scene H:

[0036] S ( t 1 ) = r e c t ( t 1 T p ) exp ( j 2 π ( f c t 1 + 0.5 μt 1 2 ...

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Abstract

The invention discloses an inverse synthetic aperture radar self-focusing imaging method based on double sparse constraints. The invention mainly aims to solve the problem in the traditional inverse synthetic aperture radar imaging method that imaging is defocused when the resolution is limited by emission bandwidth and echo is interfered by phase error. According to the technical scheme, the method comprises the following steps: (1) using radar to irradiate a sparse target scene H to obtain an echo signal Sr (tau, t) of the scene; (2) discretely sampling the echo signal Sr (tau, t) in a two-dimension mode to obtain a discrete echo matrix Sr, and constructing an echo matrix Sre containing phase error; (3) obtaining a double sparse constraint function according to the echo matrix Sre containing phase error, and constructing a Lagrangian function f (U, Z); and (4) solving the Lagrangian function f (U, Z) by an alternate iteration method to obtain an image of the scene H. By adopting the method of the invention, inverse synthetic aperture radar high-resolution imaging can be realized, and self-focusing imaging can be realized based on phase error correction.

Description

technical field [0001] The invention belongs to the field of radar technology, in particular to a sparse representation inverse synthetic aperture radar self-focusing imaging method capable of effectively processing large scenes, which can be used for moving target imaging, large-area surveying and mapping, cartography, and all-day and all-weather reconnaissance , and combined with the phase error correction method, it can be used for in-focus imaging. Background technique [0002] Inverse synthetic aperture radar (ISAR) is developed on the basis of SAR. It is mainly used for imaging non-cooperative moving targets on stationary radar platforms. It has high-resolution, all-day and all-weather imaging capabilities, and has been widely used in military and civilian applications. Applications. Traditional ISAR imaging is based on Fourier transform to obtain target imaging. The distance resolution is proportional to the bandwidth of the detection signal. In order to obtain high...

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Application Information

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IPC IPC(8): G01S13/90
CPCG01S13/90G01S13/9064
Inventor 赵光辉刘永飞沈方芳石光明左功玉
Owner XIDIAN UNIV