Bistatic synthetic aperture radar (BSAR) frequency domain imaging method

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

Active Publication Date: 2012-10-24
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 probl...

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

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Embodiment Construction

[0085] The present invention will be further elaborated below in conjunction with the accompanying drawings and specific embodiments.

[0086] The present invention mainly adopts the method of simulation experiment to verify, and all steps and conclusions are verified correctly on Matlab2010. The present invention will be further described in detail with regard to specific embodiments below.

[0087] 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 direction tangent to the track, and the z-axis is the direction vertical to the ground.

[0088] 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:

[0089] Step 1: For any point target in the imaging area, calc...

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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 technical field of radar, and in particular relates to an imaging method of a bistatic SAR in a shift mode in a synthetic aperture radar (Synthetic Aperure Radar, SAR) imaging technology. Background technique [0002] SAR is an all-day, all-weather modern high-resolution microwave remote sensing imaging radar. increasingly important role. [0003] Bistatic SAR has many outstanding advantages due to the separation of transceivers. It can obtain the non-backscatter information of the target, and has the characteristics of long range, concealment and strong anti-interference. In addition, because the bistatic SAR receiver does not contain high-power devices, it has low power consumption, small size, and light weight, and is easy to carry on various types of aircraft, and its cost is low. In short, bistatic SAR, as a new means of space observation of the earth, has a broad space for development in many fields. [0004] In th...

Claims

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Application Information

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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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