Moving target detection and video imaging method based on SAR image sequence

An image sequence and moving target technology, applied in the field of measurement and testing, to achieve the effect of improving reliability, high detection performance, and improving application level

Pending Publication Date: 2022-01-14
BEIJING RES INST OF TELEMETRY +1
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the shortcomings of the existing single-channel SAR-GMTI system. By dividing the full-aperture echo data into sub-apertures, an image sequence is formed, and the position difference of the moving target in the image sequence is used to realize the detection and speed measurement of the moving target. At the same time, multiple focusing can be used to improve the speed measurement accuracy of the moving target, and the relationship between the irradiation time of the center of the moving target and the positioning position of the moving target can be used to realize the positioning of the moving target. Based on the method of moving target detection and speed measurement and positioning, the video display of the moving target can be realized

Method used

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  • Moving target detection and video imaging method based on SAR image sequence
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  • Moving target detection and video imaging method based on SAR image sequence

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Embodiment 1

[0064] Such as figure 1 Shown, a kind of moving target detection and video imaging method based on SAR image sequence comprises the following steps:

[0065] S1. Moving target detection, matching and confirmation: Based on the single-channel high-resolution SAR image data, the image sequence is formed by sub-aperture division, and the CFAR algorithm is used to detect the moving target in the image sequence, and the suspected moving target is matched and confirmed. Until all the moving targets are marked, and the imaging sequence of the moving targets is obtained; figure 2 Shown is the flow chart of moving target detection using CFAR algorithm.

[0066] Step S1 comprises the following steps:

[0067] S11. Forming an image sequence: forming a sub-image sequence based on the single-channel high-resolution SAR image full-aperture echo data through sub-aperture division;

[0068] S12. Target detection, matching and confirmation: use the CFAR algorithm to detect moving targets i...

Embodiment 2

[0104] Such as Figure 5 As shown, a moving target detection and video imaging method based on a SAR image sequence, through sub-aperture segmentation imaging of the full-aperture echo data, a sub-image sequence is formed, and moving target detection, matching and confirmation are performed based on the sub-image sequence. After the moving target is confirmed, the position of each moving target in all images is differentiated, the speed of the moving target is estimated by using the position-moving relationship, and the moving target is accurately focused by using the estimated moving target motion parameters, and the focused moving target The target position is differentiated again to obtain a more accurate speed estimate. At the same time, the relationship between the irradiation time of the moving target center and the positioning position of the moving target is used to locate the moving target. Finally, the overlapping time of the sub-aperture is designed according to the ...

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Abstract

The invention provides a moving target detection and video imaging method based on an SAR image sequence. The method comprises the following steps: carrying out sub-aperture division on full-aperture echo data; detecting, matching and confirming the moving target based on the sub-image sequence; realizing detection and speed measurement of a moving target by utilizing a displacement relationship between the sub-images; performing multiple times of focusing to improve the speed measurement precision of the moving target; positioning the moving target according to the relation between the center irradiation time of the moving target and the positioning position of the moving target; and finally, according to the resolution requirement and the frame rate design sub-aperture time of the system, carrying out confirmation association on the moving target to form a video SAR image. Compared with a multi-channel moving target detection system, the moving target detection method based on the single channel has the advantages that the hardware cost and complexity of the system are further reduced, the reliability is improved, the method is more suitable for detection of a slow target, continuous video display of a radar detection area can be realized, and the application level of SAR image products can be obviously improved.

Description

technical field [0001] The invention relates to the technical field of measurement and testing, in particular to a moving target detection and video imaging method based on a SAR image sequence. Background technique [0002] Spaceborne SAR is an active remote sensing payload that works in the microwave band. It can observe the earth all-weather and all-weather without being limited by sunshine and weather conditions, and conduct continuous reconnaissance and surveillance of moving targets in the target environment. Situation assessment and target strategic decision-making provide intelligence support. At the same time, spaceborne SAR combined with ground moving target indication (GMTI) function provides the possibility for large-area ground reconnaissance, surveillance, target tracking and positioning, and has important military value. [0003] At present, spaceborne SAR systems are developing towards high resolution, large swaths, miniaturization, and light weight. Under h...

Claims

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Application Information

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IPC IPC(8): G06T7/246G06K9/62G01S13/90G06V10/75
CPCG06T7/248G01S13/9021G06T2207/10016G06T2207/10044G06F18/22
Inventor 马晓萌丁金闪梁健
Owner BEIJING RES INST OF TELEMETRY
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