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Back projection imaging method of synthetic aperture radar based on keystone transform

A technology of synthetic aperture radar and imaging method, which is applied in the field of radar and can solve problems such as defocus and motion error

Inactive Publication Date: 2019-01-15
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

[0006] Aiming at the defects existing in the prior art, the present invention provides a synthetic aperture radar back-projection imaging method based on keystone transformation, which solves the problem that the traditional back-projection imaging algorithm is defocused by motion errors during the actual flight process, thereby realizing SAR Precise focus imaging

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  • Back projection imaging method of synthetic aperture radar based on keystone transform
  • Back projection imaging method of synthetic aperture radar based on keystone transform
  • Back projection imaging method of synthetic aperture radar based on keystone transform

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Embodiment Construction

[0063] The present invention mainly adopts the mode of simulation experiment for verification, and the simulation verification platform is . Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0064] see figure 1 , the present invention provides a synthetic aperture radar back projection imaging method based on keystone transform, which is realized by the following steps:

[0065] Step 1, establish the SAR space geometry structure, and initialize the parameters.

[0066] see figure 2 , the geometric structure of the SAR used in the embodiment of the present invention is shown in the figure. The initialization parameters are shown in the following table (1). In the Cartesian coordinate system, the position coordinates of the radar at zero time are (X 0 ,0,H 0 ) is (-15km, -5km, 15km), the flight speed of the radar is V=200m / s, the flight speed is parallel to the Y axis, and a random error is added to simul...

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Abstract

The invention discloses a back projection imaging method of a synthetic aperture radar based on keystone transform, belonging to the technical field of radars. The method combines keystone transform-based distance correction and back projection imaging algorithm, solving a problem of bokeh of a traditional back projection imaging algorithm caused by a motion error in actual flying process. According to the method, distance with a motion error is corrected by using keystone transform, then a target distance course after distance correction is calculated, and target echo energy is refocused by using a back projection algorithm, therefore, imaging of the SAR under a condition of motion error is completed.

Description

technical field [0001] The invention belongs to the technical field of radar, in particular to a synthetic aperture radar back projection imaging method based on keystone transformation. Background technique [0002] Synthetic aperture radar is an all-weather, all-weather modern high-resolution microwave remote sensing imaging radar, which uses the relative motion between the radar antenna and the target area to obtain high spatial resolution. Synthetic aperture radar has played an increasingly important role in the fields of terrain surveying and mapping, vegetation analysis, ocean and hydrological observation, environment and disaster monitoring, resource exploration, and detection of small changes in the earth's crust. [0003] The keystone transform is a kind of scale transformation. It can correct the range migration of the synthetic aperture radar target by interpolating and reconstructing the slow time domain in the range frequency-azimuth time domain without the prio...

Claims

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Application Information

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IPC IPC(8): G01S13/90
Inventor 李中余杨青武俊杰刘竹天黄钰林杨建宇
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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