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Space target three-dimensional reconstruction method based on factorization and ISEA

A space target and factorization technology, applied in the field of three-dimensional reconstruction of space targets based on factorization and ISEA, can solve the problems of inability to obtain the projection matrix and the failure of the ISEA method, and achieves strong feasibility and robustness. Operation difficulty, the effect of reducing difficulty

Active Publication Date: 2022-06-17
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the target itself has unknown motion, the projection matrix cannot be obtained by effectively modeling the motion of the target, making the ISEA method invalid

Method used

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  • Space target three-dimensional reconstruction method based on factorization and ISEA
  • Space target three-dimensional reconstruction method based on factorization and ISEA
  • Space target three-dimensional reconstruction method based on factorization and ISEA

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Embodiment 1

[0054] In order to solve the problems of high difficulty in extracting and correlating the scattering centers in the prior art, and the traditional ISEA method cannot reconstruct space targets with unknown on-orbit attitudes, the present invention proposes a three-dimensional reconstruction of space targets based on factorization and ISEA Method, through the extraction of key feature points on the ISAR image sequence of the space target, a range-Doppler measurement matrix is ​​formed, and then the factorization method is used to estimate the projection matrix of the three-dimensional structure of the space target to the two-dimensional ISAR image sequence. ISEA's 3D reconstruction method obtains the 3D structure of the spatial target.

[0055] Specifically, see figure 1 , figure 1 It is a schematic flowchart of a method for three-dimensional reconstruction of a space target based on factorization and ISEA provided by an embodiment of the present invention, which includes the ...

Embodiment 2

[0119] The correctness and effectiveness of the method proposed by the present invention are further illustrated below through point target simulation imaging experiments.

[0120] (1) Simulation conditions

[0121] See figure 2 and image 3 , figure 2 is a schematic diagram of a space target observation model provided by an embodiment of the present invention; image 3 is the spatial target point model provided by the embodiment of the present invention. The key parameters of the experiment are shown in Table 1.

[0122]

[0123] (2) Simulation experiment content and result analysis

[0124] 2.1 Using the high-resolution ISAR imaging method, the figure 2 ISAR image sequence of the point model shown. The results are shown in FIG. 4 . Among them, Figure 4(a) is the imaging result of the 16th frame; Figure 4(b) is the imaging result of the 68th frame;

[0125] 2.2 Extract 8 feature points located at the vertices of solar panels and satellite SAR antennas in each f...

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Abstract

The invention discloses a space target three-dimensional reconstruction method based on factorization and ISEA, and the method comprises the steps: carrying out the preprocessing and imaging of large-angle ISAR echo data of a space target, and obtaining a plurality of frames of ISAR image sequences; extracting part of key feature points in the ISAR image sequence to obtain a track matrix, and estimating a projection matrix by using a factorization method; taking the energy accumulation value of the scattering point on the ISAR image sequence as an optimized target function, and searching and reconstructing three-dimensional distribution of a space target scattering center by using a particle swarm optimization algorithm to obtain an initial set of the scattering center; and based on the projection matrix, the scattering centers in the initial set are projected to corresponding positions in the ISAR image sequence, so that error points in the initial set are eliminated, and a final space target three-dimensional reconstruction scattering center set is obtained. According to the method, the difficulty of scattering center extraction and association is greatly reduced, and the problem that an existing ISEA algorithm cannot reconstruct a space target with unknown motion parameters is solved.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and in particular relates to a three-dimensional reconstruction method of a space target based on factorization and ISEA. Background technique [0002] Inverse Synthetic Aperture Radar (ISAR) imaging technology is one of the most effective ways to observe space targets. It transmits a series of broadband electromagnetic pulse signals through the radar to continuously observe the space target for a long time and at a large angle, and performs range pulse compression and azimuth coherent accumulation on the echo signal, so as to obtain a two-dimensional high-resolution image of the observed target. . However, the two-dimensional ISAR image obtained by the above method is only the projection of the three-dimensional structure of the space target on the radar imaging plane, which cannot truly reflect the three-dimensional structure of the space target, and it is difficult to meet the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/55G06N3/00G06T7/66G01S13/90
CPCG06T7/55G06T7/66G06N3/006G01S13/9019G01S13/9064G06T2207/10044G06T2207/20081G06T2207/30181
Inventor 周峰杨光照周佐邦刘磊白雪茹
Owner XIDIAN UNIV