A method for tracking moving targets in high and low orbit video sar

Abstract

The invention discloses a high and low orbit video SAR moving target tracking method. By using the local minimum entropy method to select the speed, when the entropy of the image is within the selectable speed range and the entropy reaches the minimum, an image with good focusing effect and less confusion can be obtained. , so as to clarify the azimuth velocity of the moving target, and avoid the range migration and defocusing of the imaging in the dual-base mode with heterogeneous high and low orbits; relocate the focused imaging results through the matched filter function and azimuth offset, and solve the problem of frequency The speed of the moving target in domain imaging leads to the problem that the imaging position of the target is different from the actual position; at the same time, the present invention considers that the slow target may be submerged in the spectrum of static clutter, and the use of dual-channel DPCA can preserve these submerged in the clutter Moving targets in wave area and suppress clutter at the same time to realize detection and tracking.

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...

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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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