Frequency domain expansion based spaceborne/airborne hybrid bistatic synthetic aperture radar 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 large amount of calculation, complicated process, and low imaging accuracy

Inactive Publication Date: 2011-04-06
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] In order to overcome the shortcomings of the traditional star-machine combined bistatic SAR imaging accuracy, complex process, and large amount of calculation, the present invention provides a star-machine combined bistatic SAR imaging method based on frequency domain expansion, which is different from the traditional method Compared with this method, the method of the present invention has the advantages of simple process, small amount of calculation, and can obtain a good focusing effect of the target when the two platforms of the star plane fly obliquely at a large angle, and the aircraft squints. Imaging of machine-joined bistatic synthetic aperture radar

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  • Frequency domain expansion based spaceborne/airborne hybrid bistatic synthetic aperture radar imaging method
  • Frequency domain expansion based spaceborne/airborne hybrid bistatic synthetic aperture radar imaging method
  • Frequency domain expansion based spaceborne/airborne hybrid bistatic synthetic aperture radar imaging method

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Embodiment Construction

[0103] The present invention mainly adopts the method of simulation experiment for verification, and all steps and conclusions are verified correctly on MATLAB7.0. The specific implementation steps are as follows:

[0104] Step 1. Use computer simulation to generate simulation data of the satellite-machine joint bistatic synthetic aperture radar. The system parameters required for the simulation are as follows: figure 2 Shown. And define the synthetic aperture radar imaging space and initialize the imaging system parameters;

[0105] Step 2. Compress the raw data of the satellite-machine joint bistatic synthetic aperture radar.

[0106] Write the received synthetic aperture radar range echo signal in matrix form according to the pulse repetition period, denoted as s 0 (τ, t), the row of the matrix represents the PRF time, the column of the matrix represents the echo delay time; the received satellite-machine joint bistatic synthetic aperture radar raw data is compressed using the s...

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Abstract

The invention discloses a frequency domain expansion based spaceborne/airborne hybrid bistatic synthetic aperture radar imaging method. Firstly a spaceborne/airborne hybrid bistatic synthetic aperture radar oblique distance type model is built in any mode; then a two-dimensional frequency domain model is obtained by deduction; and then the phase item of the frequency spectrum is subject to Taylor expansion in fast time frequency and slow time frequency, and phase compensation is carried out, thus obtaining good focusing effect; and finally distortion is corrected, thus obtaining correct position of a target. The invention has the advantages that flow is simple, computation is less, and good focusing effect of target can be obtained in spaceborne and airborne platform high-angle diagonal flying mode and airplane squint mode; the invention can be used for imaging of large scene spaceborne/airborne hybrid bistatic synthetic aperture radar and is applicable to the fields of synthetic aperture radar imaging and earth remote sensing.

Description

Technical field: [0001] The invention belongs to the field of radar technology, and particularly relates to a satellite-machine joint bistatic synthetic aperture radar imaging method in the synthetic aperture radar (SAR) imaging technology. Background technique: [0002] Bistatic Synthetic Aperture Radar (Bistatic SAR) is a new type of synthetic aperture radar system in which transmitters and receivers are installed on different moving platforms. Spaceborne-Airborne Bistatic Synthetic Aperture Radar (Spaceborne-Airborne Bistatic SAR) is a special mode of bistatic synthetic aperture radar. It adopts the working mode of satellite launch and single (multiple) aircraft reception. It inherits the bistatic synthetic aperture radar. In addition to the advantages, it also has the following unique advantages: [0003] 1. Wide imaging range and high image signal-to-noise ratio [0004] Since the satellite-machine joint bistatic synthetic aperture radar adopts the unique "far-transmitting and...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
Inventor 张晓玲吴浩然
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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