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Two-dimensional spatial-variant correction method for airborne double base forward looking SAR azimuth phase

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 effects, and achieve the effects of improving focus accuracy and improving detection and identification performance

Active Publication Date: 2018-10-26
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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  • Two-dimensional spatial-variant correction method for airborne double base forward looking SAR azimuth phase
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  • Two-dimensional spatial-variant correction method for airborne double base forward looking SAR azimuth phase

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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 provides a two-dimensional spatial-variant correction method for an airborne double base forward looking SAR azimuth phase. The technical problems in the prior art of poor azimuth phasefocusing effects under large wide scene imaging can be solved. The method includes the following steps: calculating the slant range of an airborne double base forward looking SAR; calculating the Taylor expansion of the slant range of the airborne double base forward looking SAR; calculating echo signals of a scene center point according to the Taylor expansion; performing range processing on theecho signals of the scene center point; performing azimuth high-order phase filtering on the echo signals after range migration correction; performing azimuth spatial-variant correction on filtered azimuth signals; and performing range spatial-variant correction on azimuth non spatial-variant echo signals. The method can effectively enhance the focusing precision of SAR echo data so that high quality SAR images can be obtained, and therefore, SAR image detection and discriminating performance can be enhanced.

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...

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Application Information

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Patent Type & Authority Applications(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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