Imaging method for bistatic forward-looking synthetic aperture radar (SAR)

A technology of synthetic aperture radar, imaging method, applied in the direction of reflection/re-radiation of radio waves, utilization of re-radiation, measurement devices, etc.

Inactive Publication Date: 2011-08-10
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to propose a bistatic forward-looking synthetic aperture radar imaging method in order to solve the defects of existing methods in bistatic forward-looking synthetic aperture radar imaging processing

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  • Imaging method for bistatic forward-looking synthetic aperture radar (SAR)

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Embodiment Construction

[0043] The present invention mainly adopts the method of simulation experiment to verify, and all steps and conclusions are verified correctly on Matlab2010. The method of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0044] The schematic flow chart of the bistatic forward-looking SAR imaging method of the present invention is as follows figure 1 As shown, the specific process is as follows:

[0045] Step 1: Initialize the parameters of the imaging system. The imaging geometry mode diagram 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. The target scenario used in this embodiment is as follows Figure 4 As shown, the black dots in the figure are ...

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Abstract

The invention discloses an imaging method for a bistatic forward-looking synthetic aperture radar (SAR). Aiming at the defect existing when the existing method is used for the imaging process of the bistatic forward-looking synthetic aperture radar, the imaging method adopts a bistatic forward-looking SAR point target response two-dimensional frequency spectrum based on the least square polynomial fitting; the frequency spectrum is the least square approximation of the two-dimensional frequency spectrum with the accurate theory. According to the characteristics of bistatic forward-looking invariant SAR direction, variant range and nonlinear and variant Doppler centroid range of range cell migration in an RD (radar domain) domain, bistatic forward-looking SAR range migration correction, secondary-range compression and high-order phase compensation are realized by the frequency spectrum so as to accurately focus the bistatic forward-looking SAR. Compared with the traditional SAR imaging method and the bistatic forward-looking SAR imaging method, the method disclosed by the invention has higher imaging precision.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and in particular relates to an imaging method of a bistatic forward-looking synthetic aperture radar (SAR, Synthetic Aperture Radar). Background technique [0002] Compared with optical sensors, synthetic aperture radar has the unique advantages of strong penetrability and ability to work all day and all day, and has been widely used at present. Bistatic SAR is a new radar system. The system’s transmitting station and receiving station are placed on different platforms. The characteristics of separate sending and receiving make it have many outstanding advantages and characteristics, such as the acquisition of rich target information, long range, Good security, strong anti-interference ability, etc. [0003] Bistatic forward-looking SAR refers to the bistatic SAR system in which the transmitting and receiving beams point to the ground in front of the moving receiving station. D...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90G01S7/41
Inventor 武俊杰杨海光黄钰林杨建宇李文超张晓玲杨晓波孔令讲
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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