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Geometric correction method for large rake forward synthetic aperture radar return image

A technology of synthetic aperture radar and geometric correction, which is applied in the direction of radio wave reflection/re-radiation, use of re-radiation, radio wave measurement system, etc., can solve the problem of increasing the amount of calculation, to avoid under-sampling, eliminate space variability, several times The effect of any correction

Inactive Publication Date: 2013-11-27
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

But adding a low-pass operation will inevitably increase the amount of calculation

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  • Geometric correction method for large rake forward synthetic aperture radar return image
  • Geometric correction method for large rake forward synthetic aperture radar return image
  • Geometric correction method for large rake forward synthetic aperture radar return image

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Embodiment Construction

[0018] The present invention provides a geometric correction method for large forward oblique synthetic aperture radar echo images. The present invention will be described in detail below in conjunction with the accompanying drawings and examples:

[0019] like figure 1 As shown, OXYZ is a spatial rectangular coordinate system, where the OXY plane is on the ground plane, and the Z axis is vertical to the ground plane; the radar platform O r On the Z axis, the distance from 0 point is h, parallel to the Y axis, and the speed is v; P is the center point of the imaging scene, θ is the front slope angle of the target, and α is the radar platform velocity vector projected on the ground and the beam line of sight direction The included angle projected on the ground is called the azimuth angle, and β is the included angle between the line-of-sight direction of the beam and the ground, called the pitch angle. Spectral Analysis (SPECAN) algorithm was used for imaging processing, and t...

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Abstract

The invention discloses a geometric correction two-dimensional Sinc interpolation method for a large rake forward synthetic aperture radar (SAR), which belongs to the technical field of SAR imaging. According to the asymmetrical characteristic of a point spread function side band, a novel two-dimensional Sinc interpolation function is constructed for the geometric correction of a large rake forward SAR image. The method also introduces two parameters into the interpolation function, so interpolation and lowpass filtering can be realized at the same time, the spatial variability of image resolution can be eliminated, and under-sampling can be avoided when a ground distance pixel interval is larger.

Description

technical field [0001] The invention relates to the field of synthetic aperture radar (SAR) imaging, in particular to a geometric correction method for large forward oblique synthetic aperture radar echo images. Background technique [0002] In the large forward slope SAR, the forward slope angle changes drastically with the slope distance, so that the Doppler center and the Doppler modulation frequency change significantly with the slope distance, and the spatial variability of these Doppler parameters must be considered in imaging processing . Due to the consideration of the spatial variability of the Doppler center, the point spread function derived by the imaging algorithm has an asymmetric two-dimensional sidelobe. This asymmetric sidelobe structure will cause its spectrum to be distorted, so that it is no longer symmetrical about the frequency axis. . Due to the limited sampling rate, spectral distortion often develops into spectral folding. [0003] The SAR slant-r...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/02G01S13/90
Inventor 姚迪丁泽刚田卫明龙腾李英贺刘荦锶
Owner BEIJING INSTITUTE OF TECHNOLOGYGY