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A Coordinate Recovery Method of Discontinuous Scattering Center Based on ISAR Image Sequence

A technology of scattering center and image sequence, applied in the direction of reflection/re-radiation of radio waves, use of re-radiation, instruments, etc., can solve the problems of inability to complete the matching between scattering centers and frames, and reduce the accuracy of coordinate recovery, and achieve real-time benefits for hardware. The effect of processing, improving accuracy, and simple method

Active Publication Date: 2019-01-15
XIAN INSTITUE OF SPACE RADIO TECH
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Problems solved by technology

The advantage of this method is that the three-dimensional position coordinates of the target scattering center can be obtained. The disadvantage is that when a scattering center is blocked, the inter-frame matching of the scattering center cannot be completed, thereby reducing the accuracy of coordinate recovery.

Method used

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  • A Coordinate Recovery Method of Discontinuous Scattering Center Based on ISAR Image Sequence
  • A Coordinate Recovery Method of Discontinuous Scattering Center Based on ISAR Image Sequence
  • A Coordinate Recovery Method of Discontinuous Scattering Center Based on ISAR Image Sequence

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Embodiment Construction

[0039] The present invention aims at the problem that the same scattering center is occluded in different frame images, and the scattering center cannot complete inter-frame matching. On the basis of conventional ISAR imaging, the ISAR image is calibrated in the distance direction and azimuth direction, and the singular value decomposition is used. and orthogonal constraint conditions, decompose the incomplete coordinate input matrix missing a certain scattering center, and then obtain the coordinate value of the missing scattering center, which improves the recovery accuracy of the radar target scattering center. The method of the present invention is described in detail below in conjunction with the accompanying drawings illustrate.

[0040] like figure 1 Shown is a principle flow chart of a discontinuous scattering center coordinate recovery method based on ISAR image sequence, including the following steps:

[0041] (1) if figure 2 The schematic diagram of the ISAR imag...

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Abstract

The invention provides a discontinuous scattering center coordinate recovery method based on an ISAR image sequence. Firstly, a radar is placed in front of a rotation table and a target is placed on the rotation table, the rotation table is allowed to drive the target to rotate, the radar is fixed and emits electromagnetic waves to the target and receives the reflection echo of a scattering center on the target, then through the pulse compression of a range direction and the Doppler processing of an azimuth direction, the ISAR two-dimensional image of the target is obtained, the position coordinate of the scattering center in the image is obtained, thus a coordinate matrix is constructed and obtained, finally a row where is scattering center to be recovered is located is removed to obtain an incomplete coordinate matrix, the incomplete coordinate matrix is subjected to singular value decomposition, the scattering center coordinate to be recovered is calculated and obtained, and the recovery of the scattering center coordinate is completed.

Description

technical field [0001] The invention relates to the technical field of radar ISAR imaging and singular value decomposition, in particular to a method for recovering discontinuous scattering center coordinates based on ISAR image sequences. Background technique [0002] The traditional radar target scattering center position recovery methods include two types, one is based on the single-pulse off-axis angle three-dimensional reconstruction in the one-dimensional range direction. In this method, the radar first transmits a large bandwidth signal to obtain a high-resolution one-dimensional Then use the horizontal and elevation and difference beams to measure the two-dimensional angle of the echo signal of each range unit, and the spatial distribution of the scattering points on the target can be obtained, that is, the three-dimensional structure of the target. The advantage of this method is that it is simple to implement and can be real-time However, there may be multiple scat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
CPCG01S13/904G01S13/9064
Inventor 李栋魏振宋大伟孙文锋范晓彦罗熹温媛媛
Owner XIAN INSTITUE OF SPACE RADIO TECH
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