Imaging method for curvilinear synthetic aperture radar

A technology of synthetic aperture radar and imaging method, which is applied in the direction of radio wave reflection/re-radiation, use of re-radiation, radio wave measurement system, etc., and can solve the problem of not considering the size of the coverage area of ​​the wavenumber spectrum support domain, the loss of focusing energy, and the impact on imaging Quality and other issues, to achieve the effect of improving the focus effect, reducing energy loss, and expanding the overlapping range

Active Publication Date: 2020-06-02
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

But the disadvantage is that it does not consider the coverage area of ​​the wavenumber spectrum support domain in the interpolation area, resulting in a great waste of data in the wavenumber spectrum support domain, resulting in the loss of focusing energy and affecting the imaging quality

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  • Imaging method for curvilinear synthetic aperture radar
  • Imaging method for curvilinear synthetic aperture radar
  • Imaging method for curvilinear synthetic aperture radar

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Embodiment Construction

[0022] The present invention will be described in detail below in conjunction with the accompanying drawings and simulation examples to prove the practicability of the present invention.

[0023] as attached figure 1 As shown, through the imaging method of a kind of curved synthetic aperture radar of the present invention, can input as the original echo of curved SAR, after imaging processing, obtain the two-dimensional image of curved SAR, concrete implementation steps are as follows:

[0024] Step 1: Perform distance preprocessing on the original echo: perform de-FM processing on the received signal to obtain the intermediate frequency signal s i (t,t), whose expression is:

[0025]

[0026] where R a (t) is the reference slope distance, △R(t)=R t (t)-R a (t), Tp is the signal pulse width, t is the fast time of the radar signal, t is the slow time of the radar signal, c is the speed of light, α is the frequency modulation slope of the radar signal, f c is the signal ...

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Abstract

The invention belongs to the technical field of radar imaging, and particularly relates to an imaging method for a curve synthetic aperture radar. According to the imaging method, a specific positionof an interpolation region is determined by calculating a geometric center point of a wave number support domain, thus an interpolation area covering a larger wave number support domain range is obtained, data information in the wave number support domain can be well utilized, and the imaging quality is improved. Moreover, the imaging method only relates to simple arithmetic operation, and does not relate to complex calculation operations such as sliding windows, so that the implementation mode of the method is very simple.

Description

technical field [0001] The invention belongs to the technical field of radar imaging, and in particular relates to an imaging method for curved synthetic aperture radar. Background technique [0002] Synthetic aperture radar uses the correlation of radar echo signals to accumulate the Doppler shift of echo signals during radar motion, and synthesizes equivalent radar apertures in the direction of radar motion to achieve high-resolution imaging. It can realize all-day and all-weather regional monitoring and imaging. Curved SAR is a new mode of SAR, and its trajectory is a curve. Analyze the wavenumber domain distribution of the signal in the curved SAR mode. Since the direction of the radial wavenumber vector KR of the echo is consistent with the radial distance vector R of the radar relative to the target, when the radar trajectory is a curve, the wavenumber of the radar echo The domain also presents an irregular distribution (like a scatter-like distribution), and a scatt...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S13/9011G01S13/9088
Inventor 李晋刘兴航闵锐皮亦鸣曹宗杰崔宗勇
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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