Three-dimensional position reconstructing method based on ISAR (inverse synthetic aperture radar) image sequence for scattering point

A technology of three-dimensional position and scattering points, which is applied in the directions of radio wave reflection/re-radiation, measurement devices, and utilization of re-radiation, etc. It can solve the problems of radar viewing angle and target motion parameters that are difficult to obtain directly, and achieve easy data acquisition and reconstruction. Stable performance and high resolution effects

Inactive Publication Date: 2012-02-15
BEIHANG UNIV
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Problems solved by technology

This method makes full use of the projection relationship between the position change of the corresponding scattering point in the two-dimensional image sequence and the three-dimensional position, ...

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  • Three-dimensional position reconstructing method based on ISAR (inverse synthetic aperture radar) image sequence for scattering point
  • Three-dimensional position reconstructing method based on ISAR (inverse synthetic aperture radar) image sequence for scattering point
  • Three-dimensional position reconstructing method based on ISAR (inverse synthetic aperture radar) image sequence for scattering point

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[0028] specific implementation plan

[0029] The specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0030] The flow chart of the method for reconstructing the three-dimensional position of scattering points based on the target ISAR image proposed by the present invention is as follows figure 1 As shown, it is divided into the following stages:

[0031](1) According to the basic principle of ISAR imaging, the imaging process after motion compensation is formulated, and the projection matrix equation for simulating the ISAR imaging process is obtained:

[0032] r fk d fk = T f P k = ...

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Abstract

The invention discloses a three-dimensional position reconstructing method based on an ISAR (inverse synthetic aperture radar) image sequence for a scattering point, which comprises the following four links: a target ISAR image gives the distribution information of a target strong scattering point in a radial direction and a transverse direction based on a distance-Doppler high resolution basic principle; data correlation gives a corresponding relationship between two-dimensional projection points in the ISAR image sequence and is realized by utilizing a flight path initialization method through extracting the one-dimensional radial distance information of all the scattering points in an image sequence; an observing matrix is obtained through the following steps: obtaining a target ISAR image sequence through a period of time of sampling, and after the data correlation, and combining the two-dimensional position coordinates of all the corresponding projection points in a sequence to form the observing matrix, so as to form three-dimensional reconstructed known information; and a position matrix is solved through the following step: solving the optimal estimation of a three-dimensional position matrix of a target scattering point from a subspace through carrying out singular value decomposition on the observing matrix and by utilizing a rank theory and using the orthogonality of a projection space as a constraint condition, so as to obtain a target three-dimensional reconstructed image.

Description

technical field [0001] The present invention relates to a method for reconstructing the three-dimensional position of scattering points based on ISAR (inverse synthetic aperture radar) image sequence, in particular how to utilize the two-dimensional projection information of radar target scattering points on the ISAR imaging plane, using rank theory and projection space Orthogonality of the known observation matrix is ​​used to realize the three-dimensional position reconstruction of the target scattering point through the method of singular decomposition, which belongs to the field of radar signal processing. Background technique [0002] With the continuous development of modern radar technology, radar has gone far beyond the initial meaning of "detection and ranging", and has entered a new stage of feature measurement from target parameter measurement. The basic functions of radar have expanded from detection and positioning to feature acquisition and target Recognition, ...

Claims

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Application Information

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IPC IPC(8): G01S7/41G01S13/90
Inventor 王俊文亚亚禹娟魏少明蔡多多
Owner BEIHANG UNIV
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