High-low orbit video SAR moving target tracking method

A moving target and video technology, which is applied in the field of high and low orbit video SAR moving target tracking, can solve the problems of increasing the difficulty of system implementation and increasing transmission power, and achieve the effect of convenient post-position tracking, filtering clutter interference, and short revisit time.

Active Publication Date: 2020-08-25
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, under the spaceborne platform, if the first framing mode is used, the carrier frequency of the echo needs to reach the terahertz frequency band to meet the high frame rate requirements of video imaging. However, as the carrier frequency increases, the transmit power also increases. This increases the difficulty of implementing the system

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  • High-low orbit video SAR moving target tracking method
  • High-low orbit video SAR moving target tracking method
  • High-low orbit video SAR moving target tracking method

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Embodiment Construction

[0063] The specific embodiments of the present invention are described below so that those skilled in the art can understand the present invention, but it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes Within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present invention are included in the protection list.

[0064] like figure 1 As shown, a high and low orbit video SAR moving target tracking method includes the following steps:

[0065] S1. Perform echo sub-framing on the echo signal received by the moving target receiver to obtain multi-frame echo signals;

[0066] Step S1 includes the following sub-steps:

[0067] S11. Transmit echo signals to the moving target through the high-orbit satellite, and the front and rear channe...

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Abstract

The invention discloses a high-low orbit video SAR moving target tracking method. According to the method, when the entropy of an image is enabled to be minimum in a selectable speed range due to thefact that the speed is selected by using a local minimum entropy method, the image with a good focusing effect and low chaos degree is obtained, so that the azimuth speed of a moving target is determined, and distance migration and defocusing of imaging caused by a high-low orbit heterogeneous double-base mode are avoided. A focusing imaging result is repositioned through a matched filtering function and azimuth offset, and the problem that the imaging position and the actual position of a target get in and out due to the speed of the moving target in frequency domain imaging is solved. Meanwhile, considering that a low-speed target may be submerged in the frequency spectrum of a static clutter, the moving targets submerged in a clutter region can be reserved by using the dual-channel DPCA, and clutters are suppressed at the same time, so that detection and tracking are realized.

Description

technical field [0001] The invention relates to the technical field of signal and information processing, in particular to a method for tracking a moving target in high and low orbit video SAR. Background technique [0002] Traditional synthetic aperture radar (Sythetic Aperture Radar, SAR) is a single-frame imaging radar, which can only generate static pictures for the observation area. In order to solve the problem that traditional SAR cannot monitor the observation area in real time, Sandia National Laboratory of the United States first proposed the concept of video SAR in 2003, which can realize continuous video imaging of the scene. [0003] Video SAR achieves continuous imaging by subdividing echo frames to achieve the effect of video imaging. There are two modes of echo framing for video SAR, one is the non-overlapping framing mode, and the other is the overlapping framing mode, and both modes are applicable on the airborne platform. However, under the spaceborne pl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90G01S13/66G01S7/41
CPCG01S13/904G01S13/9094G01S13/66G01S7/418G01S13/9029
Inventor 曹建蜀蔡雪莲张顺生陈江宁康慧
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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