Method for constructing SAR azimuth resolution imaging by rotating FrFT domain

A technology of azimuth resolution and imaging method, which is applied in the field of rotating FrFT domain to construct SAR azimuth resolution imaging, which can solve the problems of low imaging quality and achieve the effects of improving imaging resolution, reducing side lobe level and reducing energy.

Pending Publication Date: 2020-09-04
JIANGSU POLICE INST
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[0005] Purpose of the invention: The present invention proposes a method for constructing SAR azimuth resolution imaging in the rotational fractional Fouri

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  • Method for constructing SAR azimuth resolution imaging by rotating FrFT domain
  • Method for constructing SAR azimuth resolution imaging by rotating FrFT domain
  • Method for constructing SAR azimuth resolution imaging by rotating FrFT domain

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[0065] Such as figure 1 As shown, the method for constructing SAR azimuth resolution imaging by rotating the fractional Fourier transform FrFT domain of the present invention includes the following steps:

[0066] Step (1), SAR azimuth signal transformation analysis; specifically including the following:

[0067] ①Construction of azimuth signal model

[0068] In the SAR imaging system, the ideal point target echo is approximately in the form of a chirp signal in the azimuth direction, as shown in formula (1):

[0069] s a (t)=W a (t)exp(j2πf dc t+jπκ a t 2 ) (1)

[0070] Where f dc Is the Doppler center frequency, κ a Is the azimuth frequency modulation, W a (t)=rect(t / T a ), T a Is the synthetic aperture time, and t is the slow time variable. The definition of the fractional Fourier transform of the continuous signal f(x) is:

[0071]

[0072] Where K β (u,x) is the kernel function of the fractional Fourier transform, as shown in formula (3), β is the rotation angle and ν is the orde...

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Abstract

The invention discloses a method for constructing SAR (Synthetic Aperture Radar) azimuth high-resolution imaging in a FrFT (Fractional Fourier Transform) domain, and relates to the technical field ofimaging, in particular to a method for constructing SAR azimuth high-resolution imaging in the FrFT domain. According to the method, fractional order Fourier transform is carried out on SAR azimuth signals to obtain a calculation expression of an azimuth fractional order, and the order is unique and depends on azimuth frequency modulation rate, azimuth sampling sequence length and azimuth samplingfrequency; and on the basis of the obtained fractional order, completing the construction of the rotating fractional order Fourier transform domain and azimuth high-resolution SAR imaging method. According to the method, the problem of azimuth low-precision imaging of a traditional method is solved in synthetic aperture radar imaging, so that the SAR azimuth imaging resolution is improved, and the current practical application requirement is met.

Description

technical field [0001] The invention relates to a synthetic aperture radar imaging method, in particular to an imaging method for constructing SAR azimuth resolution by rotating an FrFT domain. Background technique [0002] As an active microwave sensor, synthetic aperture radar has the characteristics of realizing all-day and all-weather earth observation without being limited by light and climate conditions, and can penetrate the surface or vegetation to obtain the information covered by it. Broad application prospects. [0003] SAR mounts the small-aperture antenna radar on a moving carrier, uses the relative motion of the radar and various targets in the ground mapping zone, and uses coherent processing to achieve range and azimuth imaging. Common SAR imaging methods include the Range Doppler (RD) method, the wavenumber domain (ωK) method and the CS (Chirp Scaling) method, among which the Range Doppler method is the most common and classic method in SAR imaging processi...

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Application Information

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IPC IPC(8): G01S13/90
CPCG01S13/90
Inventor 王振力王群马如坡
Owner JIANGSU POLICE INST
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