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Bistatic synthetic aperture radar (BSAR) frequency domain imaging method

A technology of synthetic aperture radar and imaging method, applied in the field of radar, can solve the problems such as the inability to achieve precise focusing of bistatic SAR in shifting mode, the problem of two-dimensional space variation in bistatic SAR in shifting mode, etc.

Active Publication Date: 2013-11-13
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that the traditional SAR imaging method and the existing bistatic imaging method cannot solve the two-dimensional space change problem of the bistatic SAR in the shift mode, and thus cannot realize the precise focusing of the bistatic SAR in the shift mode, and proposes a Bistatic Synthetic Aperture Radar Frequency Domain Imaging Method

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  • Bistatic synthetic aperture radar (BSAR) frequency domain imaging method
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  • Bistatic synthetic aperture radar (BSAR) frequency domain imaging method

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Embodiment Construction

[0084] The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0085] The present invention mainly adopts the method of simulation experiment for verification, and all steps and conclusions are verified correctly on Matlab2010. The present invention will be further described in detail below with respect to specific embodiments.

[0086] The system structure adopted in this embodiment is as follows figure 2 As shown, the system coordinate system takes the imaging center target point O as the coordinate origin, the platform moves along the y axis, the x axis is the tangent track direction, and the z axis is the direction perpendicular to the ground.

[0087] The schematic flow chart of the bistatic synthetic aperture radar frequency domain imaging method of the present invention is as follows figure 1 As shown, the specific process is as follows:

[0088] Step 1: For any point target in the imaging area, calculate the distance...

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Abstract

The invention discloses a bistatic synthetic aperture radar (BSAR) frequency domain imaging method which specifically comprises the following steps of: initializing parameters of an imaging system; calculating a point target echo two-dimensional spectrum; performing rough matching focusing on a TV-BSAR by utilizing a reference point two-dimensional spectrum; performing Taylor expansion on the slope distance of a transmitting station, and combining residual phase terms; performing azimuth-to-frequency Stolt transform; performing distance-to-frequency Stolt transform; and performing two-dimensional inverse Fourier transform. The method disclosed by the invention adopts the two-dimensional Stolt frequency transform which enables the echo phase after rough focusing of the BSAR in a shift variant mode to finish the linearization of the airspace and frequency domain, thereby finishing residual distance migration correction, residual secondary distance compression and residual azimuth compression. The method effectively solves the two-dimensional space-variant problem in a shift variant bistatic mode, thereby realizing the precise focusing imaging of the BSAR in a shift variant mode.

Description

Technical field [0001] The invention belongs to the field of radar technology, and specifically relates to a shift-variable bistatic SAR imaging method in a synthetic aperture radar (Synthetic Aperture Radar, SAR) imaging technology. Background technique [0002] SAR is an all-weather, all-weather modern high-resolution microwave remote sensing imaging radar. SAR has played a more important role in terrain mapping, vegetation analysis, ocean and hydrological observation, environmental and disaster monitoring, resource exploration, and detection of minor changes in the crust. An increasingly important role. [0003] Bistatic SAR has many outstanding advantages due to the separate transmission and reception. It can obtain non-backscattering information of the target, and has the characteristics of long range, concealment and strong anti-interference. In addition, since the bistatic SAR receiver does not contain high-power components, it has low power consumption, small size, and lig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
Inventor 李中余武俊杰黄钰林杨海光杨建宇李文超
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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