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 good application Foreground, high resolution effect
Inactive Publication Date: 2013-06-05
BEIHANG UNIV
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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, and uses the observation matrix as the only data source for reconstruction, which indirectly solves the problem that it is difficult to directly obtain the radar viewing angle and target motion parameters.
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[0028] Specific implementation plan
[0029] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
[0030] The flow chart of the method for reconstructing the three-dimensional position of the scattering point 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 principles of ISAR imaging, formulate the imaging process after motion compensation to obtain the projection matrix equation that simulates the ISAR imaging process:
[0032] r fk d fk = T f P k = - ρ f T - ( w f × ρ f ) T 2 × 3 x k y k z k 3 × 1
[0033] Where r fk , D fk They are the radial distance and the lateral distance of a scattering point P in a certain frame of image in ISAR ima...
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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 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 to how to use the two-dimensional projection information of radar target scattering points on the ISAR imaging surface, using rank theory and projection space The orthogonality of, through the method of singular decomposition of the known observation matrix to realize the reconstruction of the three-dimensional position of the target scattering point, which belongs to the field of radar signal processing. Background technique [0002] With the continuous development of modern radar technology, radar has far exceeded the initial meaning of "detection and ranging". From target parameter measurement to a new stage of feature measurement, the basic functions of radar expand from detection and positioning to feature acquisition and target Recognition, the scattering center model pr...
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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