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A two-dimensional space-variant correction method for azimuth and phase of airborne bistatic forward-looking SAR

A dual-base forward-looking, two-dimensional space-varying technology, applied in the field of focus processing, can solve problems such as poor phase focus effect

Active Publication Date: 2021-07-06
XIDIAN UNIV
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Problems solved by technology

[0006] The purpose of the present invention is to address the deficiencies in the above-mentioned technologies, and propose a method for correcting the two-dimensional spatial variation of the azimuth and phase of the airborne bistatic forward-looking SAR, which is used to solve the problem of azimuth phase focusing in the imaging of large and wide scenes in the prior art Less effective technical issues

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  • A two-dimensional space-variant correction method for azimuth and phase of airborne bistatic forward-looking SAR
  • A two-dimensional space-variant correction method for azimuth and phase of airborne bistatic forward-looking SAR
  • A two-dimensional space-variant correction method for azimuth and phase of airborne bistatic forward-looking SAR

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[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0036] refer to figure 1 , a two-dimensional space-variant correction method for the azimuth phase of an airborne bistatic forward-looking SAR, comprising the following steps:

[0037] Step 1) Compute the slant range history R of the bistatic forward-looking SAR bf (t m ):

[0038] Step 1a) Build an airborne bistatic forward-looking SAR flight model, its structure is as follows figure 2 Shown:

[0039] Assuming that the receiver in the forward-looking receiving mode moves along the y-axis of the north sky east coordinate system xOyz established with its sub-satellite point as the origin, the velocity is v r The uniform linear motion of the receiver, the initial coordinates of the receiver in the xOyz coordinate system are (0,0,H r ), assuming that the transmitter in the side-looking illumination state moves along the y' axis in...

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Abstract

The invention proposes a method for correcting the two-dimensional spatial variation of the azimuth and phase of the airborne bistatic forward-looking SAR, which solves the technical problem in the prior art that the focusing effect of the azimuth phase is poor in large and wide scene imaging. The implementation steps are: computing the slant range history of the bistatic forward-looking SAR; computing the Taylor expansion of the slant range history of the bistatic forward-looking SAR; calculating the echo signal of the center point of the scene according to the Taylor expansion; The range processing is carried out on the echo signal; the azimuth high-order phase filtering is performed on the echo signal after range migration correction; the azimuth space-variation correction is performed on the filtered azimuth signal; Air Variation Correction. The invention effectively improves the focusing accuracy of SAR echo data, helps to obtain high-quality SAR images, and further improves the performance of SAR image detection and identification.

Description

technical field [0001] The invention belongs to the technical field of digital signal processing, and relates to an azimuth focusing method suitable for airborne bistatic forward-looking SAR imaging, which can be used for focusing processing in various airborne bistatic forward-looking SAR imaging algorithms. Background technique [0002] Synthetic Aperture Radar (SAR) has all-weather and all-weather working characteristics, and can realize long and short distance detection. The bistatic SAR system is a new working mode different from the monostatic SAR. The transmitter and receiver are separated on two platforms. Therefore, the configuration of the system is more flexible and diverse, and the receiver has strong adaptability and electromagnetic concealment. it is good. Compared with airborne single-base SAR, airborne dual-base forward-looking SAR can detect the area directly in front of the aircraft, and solve the problem that single-base forward-looking SAR cannot look fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/40G01S13/90
CPCG01S7/40G01S13/9017G01S13/9029G01S13/9043G01S13/9058
Inventor 李亚超梅海文全英汇梁至锰白国乐
Owner XIDIAN UNIV
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