Shadow inverse synthetic aperture imaging method for forward-scattering radar
A technology of inverse synthetic aperture and forward scattering, applied in the direction of using re-radiation, reflection/re-radiation of radio waves, measurement devices, etc. question
Inactive Publication Date: 2014-09-17
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology
The former is accurate in imaging, but due to the need for double integral operations, when the number of signal sampling points is large, the amount of calculation is large; at the same time, when processing the measured data, it is necessary to optimize the motion compensation parameters based on the minimum entropy method, which further increases Imaging calculation time limits the real-time processing of signals
Xidian University proposed a forward-scattering radar shadow inverse synthetic aperture imaging method based on motion compensation and fast Fourier transform. Due to the use of fast Fourier transform, its calculation speed is faster, but this method uses phase information When reconstructing the midline image of the target, there will be phase jumps at the odd and even points, which will affect the reconstruction effect of the midline image
Although Xidian University has proposed a compensation method for this, the premise is that the variance of the centerline image fluctuation of the target is small, which is not applicable to many targets
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[0095] In this example, the relevant parameters are as follows:
[0096] Table 1 Simulation parameters
[0097]
[0098] The shadow contour model of a typical vehicle target such as figure 2 As shown, using formula (7) to construct the forward scattering radar echo signals of targets with different speeds, the actual components are shown in Figure 3.
[0099] Adopt a kind of forward scattering radar imaging method based on fractional Fourier transform described in the present invention, finish the parameter extraction and imaging simulation under this parameter, concrete process is as follows:
[0100] Step 1: Perform parameter conversion according to the equivalent conditions of the imaging process
[0101] According to the given parameters in Table 1, for v=10m / s target, its modulation frequency γ=335.1032rad / s 2 , combined with the sampling rate and coherent integration time, the transformation angle α is obtained from (12) 0 =-1.4538. From the relationship between...
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The invention discloses a shadow inverse synthetic aperture imaging method for forward-scattering radar. According to the shadow inverse synthetic aperture imaging method for the forward-scattering radar, equivalence to a traditional inverse Fresnel transformation imaging process is carried out, fractional order domain parameters are determined, fractional order Fourier transformation is conducted on the forward-scattering radar to obtain a transformation result, and a target shadow outline is extracted according to the transformation result. Fast and accurate imaging of the moving target shadow outline is realized for the forward-scattering radar at a fractional order domain, the operating speed of the shadow inverse synthetic aperture imaging method is higher than that of the traditional inverse Fresnel transformation method, the target shadow outline obtained through the shadow inverse synthetic aperture imaging method is more accurate than the target shadow outline obtained through the traditional motion compensation plus fast Fourier transformation method, and therefore the shadow inverse synthetic aperture imaging method is more robust.
Description
technical field [0001] The invention belongs to the technical field of forward scattering radar, in particular to a forward scattering radar shadow inverse synthetic aperture imaging method based on fractional Fourier transform. Background technique [0002] Forward scatter radar is a specially configured bistatic radar that can detect, parameter estimate, and image moving targets that cross the transceiving baseline. Since the forward scatter radar cross-sectional area of the target is large and has nothing to do with the surface material and spatial shape of the target, the forward scatter radar has the ability to detect invisible targets or small targets, which is unmatched by traditional monostatic radar systems. Moreover, the forward scatter radar system is simple and easy to configure. It can form a regional warning network through a reasonable radar layout to realize regional situational awareness. Since the 1980s, due to the rapid development of stealth aircraft, ...
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Login to View More IPC IPC(8): G01S13/90G01S7/41
CPCG01S13/90G01S13/9043G01S13/9064G01S13/9058
Inventor 胡程刘长江曾涛龙腾
Owner BEIJING INSTITUTE OF TECHNOLOGYGY